Researcher Profile and Settings

Affiliation

• Research Institute for Electronic Science　Material and Molecular Sciences

Job Title

• Professor

URL

http://tamaoki.es.hokudai.ac.jp/

J-Global ID

• 200901095267819474

Research Interests

• photopharmacology   photoswitch   molecular switch   molecular machine   azobenzene   photochromism   chirality   liquid crystal   モータータンパク質   分子スイッチ   アゾベンゼン   フォトクロミック反応   分子機械   細胞操作   液晶   

Research Areas

• Nanotechnology/Materials / Functional solid-state chemistry

Educational Organization

•  Master's degree program　Graduate School of Life Science
•  Doctoral (PhD) degree program　Graduate School of Life Science

Association Memberships

• 液晶学会   高分子学会   日本化学会   The Chemical Society of Japan   The Society of Polymer Science, Japan   

Research Activities

Published Papers

• Geometry‐Induced Oligomerization of Fluorine‐Substituted Phenylazothiazole Photoswitches

  P. K. Hashim, Saugata Sahu, Kiyonori Takahashi, Shakkeeb Thazhathethil, Takayoshi Nakamura, Nobuyuki Tamaoki

  Chemistry – A European Journal 30 (19) 0947-6539 2024/02/09 

  Abstract Photoswitches are molecules that can absorb light of specific wavelengths and undergo a reversible transformation between their trans and cis isomeric forms. In phenylazo photoswitches, it is common for the less stable cis (Z) isomer to convert back to the more stable trans (E) isomer either through photochemical or thermal means. In this research, we designed new derivatives of phenylazothiazole (PAT) photoswitches, PAT‐F_n, which feature fluorine substituents on their phenyl component. These derivatives can reversibly isomerize under visible light exposure with the enrichment of E and Z isomers at photostationary state (PSS). Surprisingly, we observed an unconventional phenomenon when these PAT‐F_n (n≧2) photoswitches were in their cis isomeric state in the absence of light. Instead of the anticipated transformation from cis to trans isomer, these compounds converted to an oligomeric compound. Our detailed experimental investigation and theoretical calculations, indicated the crucial role of fluorine substituents and the distinctive geometric arrangement of the cis isomer in driving the unexpected oligomerization process originating from the cis isomeric state.
• Phenylazothiazoles as Visible-Light Photoswitches

  Runze Lin, P. K. Hashim, Saugata Sahu, Ammathnadu S. Amrutha, Nusaiba Madappuram Cheruthu, Shakkeeb Thazhathethil, Kiyonori Takahashi, Takayoshi Nakamura, Takashi Kikukawa, Nobuyuki Tamaoki

  Journal of the American Chemical Society 0002-7863 2023/04/12
• Tetraploidy-linked sensitization to CENP-E inhibition in human cells.

  Koya Yoshizawa, Akira Matsura, Masaya Shimada, Sumire Ishida-Ishihara, Fuyu Sato, Takahiro Yamamoto, Kan Yaguchi, Eiji Kawamoto, Taruho Kuroda, Kazuya Matsuo, Nobuyuki Tamaoki, Ryuichi Sakai, Yasuhito Shimada, Mithilesh Mishra, Ryota Uehara

  Molecular oncology 17 (6) 1148 - 1166 2023/01/23 

  Tetraploidy is a hallmark of cancer cells, and tetraploidy-selective cell growth suppression is a potential strategy for targeted cancer therapy. However, how tetraploid cells differ from normal diploids in their sensitivity to anti-proliferative treatments remains largely unknown. In this study, we found that tetraploid cells are significantly more susceptible to inhibitors of a mitotic kinesin (CENP-E) than diploids. Treatment with a CENP-E inhibitor preferentially diminished the tetraploid cell population in a diploid-tetraploid co-culture at optimum conditions. Live imaging revealed that a tetraploidy-linked increase in unsolvable chromosome misalignment caused substantially longer mitotic delay in tetraploids than in diploids upon moderate CENP-E inhibition. This time gap of mitotic arrest resulted in cohesion fatigue and subsequent cell death, specifically in tetraploids, leading to tetraploidy-selective cell growth suppression. In contrast, the microtubule-stabilizing compound paclitaxel caused tetraploidy-selective suppression through the aggravation of spindle multipolarization. We also found that treatment with a CENP-E inhibitor had superior generality to paclitaxel in its tetraploidy selectivity across a broader spectrum of cell lines. Our results highlight the unique properties of CENP-E inhibitors in tetraploidy-selective suppression and their potential use in the development of tetraploidy-targeting interventions in cancer.
• Chaperonin GroEL hydrolyses ortho-nitrophenyl β-galactoside

  P. K. Hashim, Hisham M. Dokainish, Nobuyuki Tamaoki

  Organic & Biomolecular Chemistry 21 (30) 6120 - 6123 1477-0520 2023 

  A serendipitous finding that the chaperonin GroEL hydrolyses ortho-nitrophenyl β-galactoside (ONPG), a well-known substrate of the enzyme β-galactosidase.
• Excited State Charge-Transfer Complexes Enable Fluorescence Color Changes in a Supramolecular Cyclophane Mechanophore

  Shakkeeb Thazhathethil, Tatsuya Muramatsu, Nobuyuki Tamaoki, Christoph Weder, Yoshimitsu Sagara

  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 61 (42) 1433-7851 2022/10 

  Mechanochromic mechanophores are reporter molecules that indicate mechanical events through changes of their photophysical properties. Supramolecular mechanophores in which the activation is based on the rearrangement of luminophores and/or quenchers without any covalent bond scission, remain less well investigated. Here, we report a cyclophane-based supramolecular mechanophore that contains a 1,6-bis(phenylethynyl)pyrene luminophore and a pyromellitic diimide quencher. In solution, the blue monomer emission of the luminophore is largely quenched and a faint reddish-orange emission originating from a charge-transfer (CT) complex is observed. A polyurethane elastomer containing the mechanophore displays orange emission in the absence of force, which is dominated by the CT-emission. Mechanical deformation causes a decrease of the CT-emission and an increase of blue monomer emission, due to the spatial separation between the luminophore and quencher. The ratio of the two emission intensities correlates with the applied stress.
• Dynamic Control of Microbial Movement by Photoswitchable ATP Antagonists

  Sampreeth Thayyil, Yukinori Nishigami, Md. Jahirul Islam, P. K. Hashim, Ken'ya Furuta, Kazuhiro Oiwa, Jian Yu, Min Yao, Toshiyuki Nakagaki, Nobuyuki Tamaoki

  Chemistry – A European Journal 28 (30) 0947-6539 2022/05/25
• Synthesis and Properties of Aromatic-Terminated Diacetylene Organogelators and Their Application to Photopatterning of Polydiacetylenes

  Ken’ichi Aoki, Nobuyuki Tamaoki, Atsushi Seki, Kenta Narazaki, Daiki Takahashi, Kousuke Horitsugu

  Langmuir 37 (44) 13160 - 13169 0743-7463 2021/11/09
• Pressure-tunable thermal conductivity observed for bisamide functionalized diacetylene crystals

  Jiajun Qi, Yuzhang Wu, Hai Jun Cho, Yuna Kim, Hiromichi Ohta, Nobuyuki Tamaoki

  JOURNAL OF MATERIALS SCIENCE 56 (27) 15481 - 15490 0022-2461 2021/09 [Refereed]
   

  The polymerization of monomeric diacetylene (DA) crystals exhibits a strong dependence on the intermolecular distance relative to the van der Waals distance, which can be tuned with macroscopic mechanical stimuli. In this study, we report the effect of external pressure on the heat transport characteristics of bisamide functionalized DA (BA-DA) crystals. The thermal conductivity (kappa) of BA-DA crystals in the monomeric state could be enhanced with pressure from 0.42 +/- 0.13 W m(-1) K-1(<= 30 MPa) to 1.10 +/- 0.50 W m(-1) K-1(>= 50 MPa) but was not significantly affected by the structural change after photopolymerization. Raman and Fourier-transform infrared spectroscopy revealed that the kappa of the BA-DA crystals is correlated with the IR-active vibrational modes of N-H and C=O bonds correlated with the intermolecular hydrogen bonding. The UV polymerization significantly affected the Raman-active vibrational modes of monomers (-C C-C C-), but their effect on the kappa was negligible, which is likely attributed to the anharmonic interatomic potential. These results can potentially be utilized in polymer-based material design for thermal management technologies, such as printing heat circuits in an economically viable way or realizing a thermal barrier coating based on DA monomers.
• Rational design and development of a lit-active photoswitchable inhibitor targeting CENP-E.

  Kazuya Matsuo, Nobuyuki Tamaoki

  Organic & biomolecular chemistry 19 (32) 6979 - 6984 2021/08/28 

  In the emerging field of photopharmacology, synthetic photoswitches based on reversible photochemical reactions are fused to bioactive molecules. Azobenzene derivatives, which can undergo trans-cis photoisomerization, are typical photoswitches. Most azobenzene-based photochemical tools are active in the thermodynamically stable trans, but not cis, form. cis-Active photochemical tools would be ideal because they can be "initially inactive and active after light illumination" in a reversible mode only by light illumination. However, only a few rational strategies for constructing such "lit-active" photopharmacological tools has been developed. Herein, we report a rationally designed lit-active photoswitchable inhibitor targeting centromere-associated protein E (CENP-E). Using the lit-active inhibitor, we were able to photoregulate CENP-E-dependent mitotic chromosome location in cells. This study provides a framework to facilitate further progress in the development of photopharmacological tools.
• Rotaxane-Based Dual Function Mechanophores Exhibiting Reversible and Irreversible Responses

  Tatsuya Muramatsu, Yuji Okado, Hanna Traeger, Stephen Schrettl, Nobuyuki Tamaoki, Christoph Weder, Yoshimitsu Sagara

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 143 (26) 9884 - 9892 0002-7863 2021/07 

  Mechanochromic mechanophores permit the design of polymers that indicate mechanical events through optical signals. Here we report rotaxane-based supramolecular mechanophores that display both reversible and irreversible fluorescence changes. These responses are triggered by different forces and are achieved by exploiting the molecular shuttling function and force-induced dethreading of rotaxanes. The new rotaxane mechanophores are composed of a ring featuring a luminophore, which is threaded onto an axle with a matching quencher and two stoppers. In the stress-free state, the luminophore is preferentially located in the proximity of the quencher, and the emission is quenched. The luminophore slides away from the quencher when a force is applied and the fluorescence is switched on. This effect is reversible, unless the force is so high that the luminophore-carrying ring slips past the stopper and dethreading occurs. We show that the combination of judiciously selected ring and stopper moieties is crucial to attain interlocked structures that display such a dual response. PU elastomers that contain such doubly responsive rotaxanes exhibit reversible fluorescence changes over multiple loading-unloading cycles due to the shuttling function, whereas permanent changes are observed upon repeated deformations to high strains due to breakage of the mechanical bond upon dethreading of the ring from the axle. This response allows one, at least conceptually, to monitor the actual deformation of polymer materials and examine mechanical damage that was inflicted in the past on the basis of an optical signal.
• Mechanically Responsive Luminescent Polymers Based on Supramolecular Cyclophane Mechanophores

  Yoshimitsu Sagara, Hanna Traeger, Jie Li, Yuji Okado, Stephen Schrettl, Nobuyuki Tamaoki, Christoph Weder

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 143 (14) 5519 - 5525 0002-7863 2021/04 [Refereed]
   

  A new approach to cyclophane-based supramolecular mechanophores is presented. We report a mechanically responsive cyclic motif that contains two fluorescent 1,6-bis(phenylethynyl)pyrene moieties that are capable of forming intramolecular excimers. The emission spectra of dilute solutions of this cyclophane and a polyurethane elastomer into which a small amount of the mechanophore (0.08 wt %) had been covalently integrated are dominated by excimer emission. Films of the cyclophane-containing polyurethane also display a considerable portion of excimer emission, but upon deformation, the fluorescence becomes monomerdominated and a perceptible change from cyan to blue is observed. The response is instant, reversible, and consistent with a mechanically induced change of the molecular conformation of the mechanophore so that the excimer-promoting interactions between the luminophores are suppressed. In-depth investigations show a correlation between the applied strain and the emission color, which can conveniently be expressed by the ratio of monomer to excimer emission intensity. The current study suggests that cyclophanes can be utilized to develop various supramolecular mechanophores that detect and visualize weak forces occurring in polymeric materials or generated by living tissues.
• A Series of Bisamide-Substituted Diacetylenes Exhibiting a Terminal Alkyl Odd/Even Parity Effect on Mechanoactivated Photopolymerization

  Jiajun Qi, Yuna Kim, Kiyonori Takahashi, Ken'ichi Aoki, Ichiro Hisaki, Takayoshi Nakamura, Nobuyuki Tamaoki

  CHEMISTRY-A EUROPEAN JOURNAL 27 (11) 3832 - 3841 0947-6539 2021/02 [Refereed]
   

  Diacetylene derivatives exhibit solid-state polymerization to polydiacetylene initiated by UV light or gamma-ray irradiation. The activation of the photopolymerization relies on the monomer diynes arrangement. Recently, it has been demonstrated that the first mechanoresponsive bisamide substituted diacetylenes (DAs) show dramatic switching from light-inert to light-reactive states at a given pressure. The origin of this unique phenomenon was apparently related to the pressure-sensitive crystalline transition in DAs, but the molecular mechanism remains elusive. To obtain more insight, herein a series of DAs with varying terminal alkyl spacer length is presented, and their molecular structural effect on the intermolecular hydrogen bonding and steric repulsion is examined. In pristine states, even-parity DAs were inactive upon UV irradiation (lambda=254 nm) unless external pressure was applied. By contrast, odd-parity DAs were easily polymerized upon UV irradiation without pressure application. However, the pressure-induced crystalline phase transition exhibiting photopolymerization was valid for all DAs regardless of their alkyl spacer length. A systematic investigation revealed that the terminal alkyl spacer length, especially its odd/even parity plays a key role in determining the intrinsic intermolecular hydrogen-bonding nature of DA crystals and the resultant molecular packing. In addition, the relevant thermochromic behavior was also observed from photopolymerized polydiacetylenes.
• Two-step mechanoresponsive luminescence and mechanical stimuli-induced release of small molecules exhibited by a luminescent cyclophane

  Yoshimitsu Sagara, Kiyonori Takahashi, Atsushi Seki, Tatsuya Muramatsu, Takayoshi Nakamura, Nobuyuki Tamaoki

  JOURNAL OF MATERIALS CHEMISTRY C 9 (5) 1671 - 1677 2050-7526 2021/02 [Refereed]
   

  Achieving multiple mechanoresponsive luminescence-related functions from a single molecule remains challenging. Here, we demonstrate that both two-step mechanoresponsive luminescence and the release of small guest molecules are achieved by a 9,10-bis(phenylethynyl)anthracene-based cyclophane. When gently crushed, the yellow-emissive crystal of the cyclophane exhibits a hypsochromic shift of the emission band, because of alterations in molecular packing at the surface. Subsequent grinding results in a bathochromic shift of the emission band due to excimer formation accompanying the transition from the crystalline state to an amorphous state. Another pseudopolymorph of the cyclophane exhibits the release of chloroform from its crystal structure in response to mechanical stimuli, accompanied by a photoluminescent color change from yellow-green to yellow. These results reveal that luminescent cyclophanes are promising candidates for creating sophisticated mechanoresponsive luminescent materials.
• A visible light-controllable Rho kinase inhibitor based on a photochromic phenylazothiazole

  Kazuya Matsuo, Sampreeth Thayyil, Mitsuyasu Kawaguchi, Hidehiko Nakagawa, Nobuyuki Tamaoki

  Chemical Communications 57 (93) 12500 - 12503 1359-7345 2021 

  Rho-associated coiled-coil-containing protein kinase (ROCK) is a serine–threonine kinase whose inhibitors are useful for the regulation of the actomyosin system.
• Glycomacrocycle-Based Azobenzene Derivatives as Chiral Dopants for Photoresponsive Cholesteric Liquid Crystals.

  Yuna Kim, Noushaba Nusrat Mafy, Stéphane Maisonneuve, Chaoqi Lin, Nobuyuki Tamaoki, Juan Xie

  ACS applied materials & interfaces 12 (46) 52146 - 52155 2020/11/18 

  We demonstrate photoresponsive cholesteric liquid crystals (CLCs) doped with glycomacrocyclic azobenzene derivatives, which exhibit large conformational changes, providing dynamic control of helical superstructures in response to a light stimulus. An unprecedented shortening of the helical pitch length and the empowerment of helical twisting power up to 500% are observed upon trans (E) to cis (Z) photoisomerization. Light-driven dynamic helix twisting and untwisting behavior affords the first example of glycomacrocyclic azobenzene-based CLCs, which can drive the mechanical movement of micro-objects. Two modes of rotation-two-directional or one-directional rotational motion (crankshaft mode)-are realized. In particular, the latter mode based on the reversible cholesteric texture transition between homogeneous stripes and focal conics leads to the accumulation of the rotation angles achieving the amplified mechanical movements.
• Electrofluorochromic Device Based on a Redox-Active Europium(III) Complex

  Yuna Kim, Hitomi Ohmagari, Akira Saso, Nobuyuki Tamaoki, Miki Hasegawa

  ACS Applied Materials & Interfaces 12 (41) 46390 - 46396 1944-8244 2020/10/14
• Photoisomerization of azobenzene units drives the photochemical reaction cycles of proteorhodopsin and bacteriorhodopsin analogues.

  Shariful Haque, Takashi Kikukawa, Nobuyuki Tamaoki

  Organic & biomolecular chemistry 18 (32) 6312 - 6327 2020/08/19 

  In this study we substituted the retinal units in proteorhodopsin (PR) and bacteriorhodopsin (BR) with azo chromophores to investigate the mechanism of photoinduced proton pumping in rhodopsins and potentially develop new artificial molecular pumps. We used an indium tin oxide electrode to investigate the photoinduced proton transfer of the azo analogues of PR and BR. We also employed flash photolysis to determine the characteristic photocycles, comprising multiple transient intermediates, of the azo chromophore-bound PR and BR. Moreover, our studies of the photoinduced proton pumping functions of azo-proteoopsin and azo-bacterioopsin complexes revealed that they did not pump protons upon illumination, even though they underwent photoinduced proton transfer and the characteristic photocycle. Mutational analysis suggested that the proton pumping malfunction of the azo analogues of PR and BR resulted from the absence of proton transfer reactions through cytoplasmic channels, even though these reactions were evoked in extracellular channels. Based on our experimental findings, we propose herein a putative model of the proton transfer reaction mechanism for the azo analogues of PR and BR.
• Mechanical and thermal stimuli-induced release of toluene included in luminescent crystals as one-dimensional solvent channels

  Yoshimitsu Sagara, Kiyonori Takahashi, Takayoshi Nakamura, Nobuyuki Tamaoki

  JOURNAL OF MATERIALS CHEMISTRY C 8 (29) 10039 - 10046 2050-7526 2020/08 [Refereed][Not invited]
   

  Luminescent materials that change their photophysical properties and molecular arrangement in response to external stimuli have attracted attention because of the potential application in sensors, memory, security inks, and informational displays. The combination of external stimuli-responsive luminescence with the release of volatile molecules would give more sophisticated photofunctional materials. Herein we discuss a 9,10-bis(phenylethynyl)anthracene derivative that formed green-emissive crystals containing one-dimensional toluene channels. Amide groups of the compounds formed linear hydrogen-bonds in the crystals. Thermal treatment resulted in a phase transition to another crystalline state with the release of the guest toluene molecules. However, little alteration in the photoluminescent properties occurred during the transition. Mechanical stimuli led to the release of volatile molecules along with an emission colour change with a transition from the crystalline to an amorphous phase. Infrared spectroscopy showed that linear hydrogen bonds remained after a thermal treatment-induced phase transition, whereas mechanical stimuli disturbed them.
• Mechanochromic Luminescence from Crystals Consisting of Intermolecular Hydrogen-Bonded Sheets

  Yoshimitsu Sagara, Kiyonori Takahashi, Takayoshi Nakamura, Nobuyuki Tamaoki

  CHEMISTRY-AN ASIAN JOURNAL 15 (4) 478 - 482 1861-4728 2020/02 [Refereed][Not invited]
   

  Introduction of functional groups that can form intermolecular hydrogen bonds into highly-emissive luminophores is a promising way to induce mechanochromic luminescence. Herein, we report that a 9,10-bis(phenylethynyl)anthracene derivative featuring two amide groups forms green-emissive crystals based on two-dimensional hydrogen-bonded molecular sheets. Mechanical grinding changed the emission from green to yellow, owing to a transition from a crystalline to an amorphous phase. Infrared spectroscopy revealed that mechanical stimuli disrupted the linear hydrogen-bonding formation. A thermal treatment recovered the original green photoluminescence.
• Photoswitchable CENP-E Inhibitor Enabling the Dynamic Control of Chromosome Movement and Mitotic Progression.

  Noushaba Nusrat Mafy, Kazuya Matsuo, Shota Hiruma, Ryota Uehara, Nobuyuki Tamaoki

  Journal of the American Chemical Society 142 (4) 1763 - 1767 2020/01/29 [Refereed][Not invited]
   

  Interfering with mitosis is a potential cancer therapy strategy. However, the lack of controllability of antimitotic drugs in cell growth suppression causes severe side effects and limits their clinical utility. Herein, we developed an azobenzene-based photoswitchable inhibitor of CENP-E, a mitotic kinesin required for chromosome transportation. The new inhibitor enabled reversible photoswitching of CENP-E activity with ∼10-fold change in IC50 between cis and trans photoisomerization states both in vitro and in living cells. It also enabled repeatable photoswitching of CENP-E-dependent chromosome congression and hence mitotic progression with UV/vis light illumination cycles. Using this technique, we could specify the exact process of mitotic progression in which CENP-E plays an indispensable role. Our data demonstrate the power of a photochemical approach for highly controllable mitotic interference as well as for discovery of precise molecular functions in dynamic cellular processes.
• Crystal structure and thermoresponsive luminescence of a 9,10-bis(phenylethynyl)anthracene-based cyclophane

  Yoshimitsu Sagara, Kiyonori Takahashi, Takayoshi Nakamura, Nobuyuki Tamaoki

  MOLECULAR SYSTEMS DESIGN & ENGINEERING 5 (1) 205 - 211 2058-9689 2020/01 [Refereed][Not invited]
   

  Introducing a cyclic structure to luminophores is a promising approach for achieving external stimuli-responsive luminescence. This is because luminescent cyclophanes containing flexible linkers tend to form several molecular assembled states. However, previously reported cyclophanes exhibiting thermoresponsive and/or mechanoresponsive luminescence have not given crystals suitable for single crystal X-ray structure analysis because of the flexible cyclic molecular structures. Such analysis is important because solved crystal structures can show unambiguous correlation between the arrangement of luminophores and photophysical properties. Here, we report the crystal structure of a cyclophane featuring a 9,10-bis(phenylethynyl)anthracene group and the thermoresponsive luminescence. The cyclophane was designed with shorter flexible oligo(ethyleneglycol) chains used as linkers bridging the luminophore and another aromatic group. The two different pi-conjugated groups were orthogonally arranged in the individual molecule, and the luminophores partially overlapped between adjacent molecules. The cyclophane showed a supercooled nematic phase at room temperature upon cooling. Thermal treatment for the kinetically trapped state led to a transition to another crystalline state and, consequently, a change in photoluminescence colour. Emission spectroscopic studies and emission lifetime measurements revealed that the luminophores formed excimers in the supercooled nematic phase, whereas no excimer formation was observed for the crystalline phases.
• Mechanoresponsive Behavior of a Polymer-Embedded Red-Light Emitting Rotaxane Mechanophore

  Muramatsu Tatsuya, Sagara Yoshimitsu, Traeger Hanna, Tamaoki Nobuyuki, Weder Christoph

  ACS APPLIED MATERIALS & INTERFACES 11 (27) 24571 - 24576 1944-8244 2019/07/10 [Refereed][Not invited]
  
• Photoresponsive Chiral Dopants: Light‐Driven Helicity Manipulation in Cholesteric Liquid Crystals for Optical and Mechanical Functions

  Yuna Kim, Nobuyuki Tamaoki

  ChemPhotoChem 2019/06/24
• Azobenzene‐Based Photoswitches Facilitating Reversible Regulation of Kinesin and Myosin Motor Systems for Nanotechnological Applications

  Ammathnadu S. Amrutha, K. R. Sunil Kumar, Nobuyuki Tamaoki

  ChemPhotoChem 3 (6) 337 - 346 2367-0932 2019/06
• Rotaxane-Based Mechanophores Enable Polymers with Mechanically Switchable White Photoluminescence

  Sagara Yoshimitsu, Karman Marc, Seki Atsushi, Pannipara Mehboobali, Tamaoki Nobuyuki, Weder Christoph

  ACS CENTRAL SCIENCE 5 (5) 874 - 881 2374-7943 2019/05/22 [Refereed][Not invited]
   

  Three mechanoresponsive polyurethane elastomers whose blue, green, and orange photoluminescence can be reversibly turned on by mechanical force were prepared and combined to create a blend that exhibits deformation-induced white photoluminescence. The three polyurethanes contain rotaxane-based supramolecular mechanoluminophores based on pi-extended pyrene, anthracene, or 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) lumino-phores, respectively, and 1,4,5,8-naphthalenetetracarboxylic diimide as an electronically matched quencher. Each polymer shows instantly reversible, strain-dependent switching of its photoluminescence intensity when stretched and relaxed, as deformation leads to a spatial separation of the luminophore and quencher. The present study shows that the photoluminescence color can easily be tailored by variation of the luminophore and also by combining several mechanophores in one material and demonstrates that adaptability is a key advantage of supramolecular approaches to create mechanoresponsive polymers.
• Mechano- and Photoresponsive Behavior of a Bis(cyanostyryl)benzene Fluorophore

  Kaneko Ryohei, Sagara Yoshimitsu, Katao Shouhei, Tamaoki Nobuyuki, Weder Christoph, Nakano Hideyuki

  CHEMISTRY-A EUROPEAN JOURNAL 25 (24) 6162 - 6169 0947-6539 2019/04/26 [Refereed][Not invited]
  
• Molecular Crankshaft Effect Converting Piston-like Molecular Motion to Continuous Rotation of Macro Objects.

  Noushaba Nusrat Mafy, Yuna Kim, Reji Thomas, Takehito Akasaka, Nobuyuki Tamaoki

  ACS applied materials & interfaces 11 (16) 15097 - 15102 2019/04/24 

  A molecular system inducing an accumulative unidirectional rotation motion of glass flakes with about 100 μm in size is introduced. The molecular system is a chiral nematic liquid crystal containing a chiral azobenzene derivative which shows a reversible E- Z photoisomerization accompanying a large helical twisting power change. A film of the molecular system shows different texture change paths upon UV and visible light irradiations inducing " E to Z" and " Z to E" photoisomerizations, respectively, of the chiral azobenzene dopant. Namely, a polygonal fingerprint texture inducing the rotation of glass flakes on the film surface was maintained during UV irradiation, while a focal conic texture inducing no rotation of glass flakes emerged during visible light irradiation. As a result, cycles of the alternative irradiation of UV and visible lights afforded many rotations toward a single direction of the glass flakes which can be considered as a continuous conversion of light energy to mechanical work. We may compare the effect of this molecular system converting "back and forth" structural change between E and Z isomers of the chiral azobenzene to a continuous rotational motion of glass flakes with the crankshaft effect converting a piston-like motion to a rotational motion seen in engines in the real world.
• A 1,6-Diphenylpyrene-Based, Photoluminescent Cyclophane Showing a Nematic Liquid-Crystalline Phase at Room Temperature

  Sagara Yoshimitsu, Muramatsu Tatsuya, Tamaoki Nobuyuki

  CRYSTALS 9 (2) 2073-4352 2019/02 [Refereed][Not invited]
   

  Photoluminescent nematic liquid crystals have been an attractive research target for decades, because of their potential applications in optoelectrical devices. Integration of luminescent motifs into cyclic structures is a promising approach to induce low-ordered liquid-crystalline phases, even though relatively large and rigid luminophores are used as emitters. Here, we demonstrate a 1,6-diphenylpyrene-based, unsymmetric cyclophane showing a stable nematic phase at room temperature and exhibiting strong photoluminescence from the condensed state. The observed sky-blue photoluminescence was dominated by the emission species ascribed to assembled luminophores rather than monomers.
• Substrate selectivity and its mechanistic insight of the photo-responsive non-nucleoside triphosphate for myosin and kinesin.

  Islam MJ, Matsuo K, Menezes HM, Takahashi M, Nakagawa H, Kakugo A, Sada K, Tamaoki N

  Organic & biomolecular chemistry 17 (1) 53 - 65 1477-0520 2018/12 [Refereed][Not invited]
   

  Linear motor proteins including kinesin and myosin are promising biomaterials for developing nano-devices. Photoswitchable substrates of these biomotors can be used to optically regulate the motility of their associated cytoskeletal filaments in in vitro systems. Here, we describe the discovery of the myosin selective azobenzene-tethered triphosphate. It enables the specific photocontrol over myosin in a reversible mode with the composite motility assay composed of both kinesin and myosin. The mechanistic insight into this myosin selectivity is also explained with the docking simulation study.
• Cyclophane-Based Fluorescence Tuning Induced by Hydrostatic Pressure Changes

  Sagara Yoshimitsu, Tamaoki Nobuyuki, Fukuhara Gaku

  CHEMPHOTOCHEM 2 (11) 959 - 963 2367-0932 2018/11 [Refereed][Not invited]
   

  In contrast to a standard steady fluorescence intensity increase of a chloroform solution of a linear chromophore unit under high pressure, a fluorescent cyclophane solution shows significant fluorescence quenching under elevated pressure. A pressure-induced enhancement of the formation of an intramolecular pi-stacked conformation is proposed to be responsible.
• Pressure-Induced Transition of Bisamide Substituted Diacetylene Crystals from Non-Photopolymerizable to Photopolymerizable State

  Yuna Kim, Ken’ichi Aoki, Masaya Fujioka, Junji Nishii, Nobuyuki Tamaoki

  ACS Applied Materials & Interfaces 10 (42) 36407 - 36414 2018/10 [Refereed][Not invited]
   

  Mechanoresponsive diacetylenes (DAs) exhibiting a transition of crystalline orientation from light-inert to light-active state upon applied force are reported. Amide units are introduced to DAs where hydrogen bonding is utilized to control intermolecular interactions. Application of external pressure (2-150 MPa) to DAs results in an emergence of new crystal phases with changing the d-spacing which possibly reduces the reaction barrier. Accordingly, the dramatic crystalline transition from "perfectly off" to "on" state to undergo the light-induced topochemical polymerization of bulk DA crystals is obtained. Subsequent UV irradiation at a wavelength of 254 nm enables the polymerization of the pressed region, changing its color from white to blue which suggests the selective formation of polydiacetylene (PDA) polymorphs. In addition, by utilizing the mechanoresponsive crystallinity with low-enough activation pressure, a new strategy for PDA patterning is demonstrated based on the selective transfer of information by means of force to a DA film. This phenomenon can be applicable to a new nanoimprinting technique where no mechanical deformation of resist materials but phase transition is induced by the mold.
• Stimuli-Responsive Dual-Color Photon Upconversion: A Singlet-to-Triplet Absorption Sensitizer in a Soft Luminescent Cyclophane

  Kazuma Mase, Yoichi Sasaki, Yoshimitsu Sagara, Nobuyuki Tamaoki, Christoph Weder, Nobuhiro Yanai, Nobuo Kimizuka

  Angewandte Chemie - International Edition 57 (11) 2806 - 2810 1521-3773 2018/03/05 [Refereed][Not invited]
   

  Reversible emission color switching of triplet–triplet annihilation-based photon upconversion (TTA-UC) is achieved by employing an Os complex sensitizer with singlet-to-triplet (S-T) absorption and an asymmetric luminescent cyclophane with switchable emission characteristics. The cyclophane contains the 9,10-bis(phenylethynyl)anthracene unit as an emitter and can assemble into two different structures, a stable crystalline phase and a metastable supercooled nematic phase. The two structures exhibit green and yellow fluorescence, respectively, and can be accessed by distinct heating/cooling sequences. The hybridization of the cyclophane with the Os complex allows near-infrared-to-visible TTA-UC. The large anti-Stokes shift is possible by the direct S-T excitation, which dispenses with the use of a conventional sequence of singlet–singlet absorption and intersystem crossing. The TTA-UC emission color is successfully switched between green and yellow by thermal stimulation.
• Inside Cover: Stimuli-Responsive Dual-Color Photon Upconversion: A Singlet-to-Triplet Absorption Sensitizer in a Soft Luminescent Cyclophane (Angew. Chem. Int. Ed. 11/2018)

  Kazuma Mase, Yoichi Sasaki, Yoshimitsu Sagara, Nobuyuki Tamaoki, Christoph Weder, Nobuhiro Yanai, Nobuo Kimizuka

  Angewandte Chemie International Edition Wiley-Blackwell 57 (11) 2730  2018/03 [Refereed][Not invited]
  
• Innentitelbild: Stimuli-Responsive Dual-Color Photon Upconversion: A Singlet-to-Triplet Absorption Sensitizer in a Soft Luminescent Cyclophane (Angew. Chem. 11/2018)

  Kazuma Mase, Yoichi Sasaki, Yoshimitsu Sagara, Nobuyuki Tamaoki, Christoph Weder, Nobuhiro Yanai, Nobuo Kimizuka

  Angewandte Chemie Wiley-Blackwell 130 (11) 2778  2018/03 [Refereed][Not invited]
  
• Rotaxanes as mechanochromic fluorescent force transducers in polymers

  Yoshimitsu Sagara, Marc Karman, Ester Verde-Sesto, Kazuya Matsuo, Yuna Kim, Nobuyuki Tamaoki, Christoph Weder

  Journal of the American Chemical Society 140 (5) 1584 - 1587 1520-5126 2018/02/07 [Refereed][Not invited]
   

  The integration of mechanophores, motifs that transduce mechanical forces into chemical reactions, allows creating materials with stress-dependent properties. Typical mechanophores are activated by cleaving weak covalent bonds, but these reactions can also be triggered by other stimuli, and this renders the behavior unspecific. Here we show that this problem can be overcome by extending the molecular-shuttle function of rotaxanes to mechanical activation. A mechanically interlocked mechanophore composed of a fluorophore-carrying macrocycle and a dumbbell-shaped molecule containing a matching quencher was integrated into a polyurethane elastomer. Deformation of this polymer causes a fluorescence turn-on, due to the spatial separation of fluorophore and quencher. This process is specific, efficient, instantly reversible, and elicits an easily detectable optical signal that correlates with the applied force.
• Linearly polarized photoluminescence from an asymmetric cyclophane showing thermo- and mechanoresponsive luminescence

  Yoshimitsu Sagara, Atsushi Seki, Yuna Kim, Nobuyuki Tamaoki

  Journal of Materials Chemistry C 6 (31) 8453 - 8459 2050-7534 2018 [Refereed][Not invited]
   

  © The Royal Society of Chemistry. The first cyclophane to exhibit linearly polarized photoluminescence in the liquid-crystalline and crystalline states is described. An asymmetric cyclophane featuring a 4,7-bis(phenylethynyl)-2,1,3-benzothiadiazole group forms a thermodynamically metastable nematic liquid-crystalline phase at room temperature. The compound sandwiched between two glass substrates coated with rubbed polyimide thin layers exhibits homogeneous alignment after shearing. The transition dipole moments of the luminophores align along the rubbing direction. As a result, linearly polarized photoluminescence is achieved at room temperature without any other host materials. Furthermore, the polarized emission is retained after the transition to the crystalline phase, which is induced by annealing at 60 °C for 1 h. The cyclophane also shows a thermal and mechanical stimuli-induced change in the photoluminescence colors.
• Targeted Activation of Molecular Transportation by Visible Light

  Ammathnadu S. Amrutha, K. R. Sunil Kumar, Takashi Kikukawa, Nobuyuki Tamaoki

  ACS Nano 11 (12) 12292 - 12301 1936-086X 2017/12/26 [Refereed][Not invited]
   

  Regulated transportation of nanoscale objects with a high degree of spatiotemporal precision is a prerequisite for the development of targeted molecular delivery. In vitro integration of the kinesin-microtubule motor system with synthetic molecules offers opportunities to develop controllable molecular shuttles for lab-on-a-chip applications. We attempted a combination of the kinesin-microtubule motor system with push-pull type azobenzene tethered inhibitory peptides (azo-peptides) through which reversible, spatiotemporal control over the kinesin motor activity was achieved locally by a single, visible wavelength. The fast thermal relaxation of the cis-isomers of azo-peptides offered us quick and complete resetting of the trans-state in the dark, circumventing the requirement of two distinct wavelengths for two-way switching of kinesin-driven microtubule motility. Herein, we report the manipulation of selected, single microtubule movement while keeping other microtubules at complete rest. The photoresponsive inhibitors discussed herein would help in realizing complex bionanodevices.
• Driving and photo-regulation of myosin-actin motors at molecular and macroscopic levels by photo-responsive high energy molecules

  Halley M. Menezes, Md. Jahirul Islam, Masayuki Takahashi, Nobuyuki Tamaoki

  ORGANIC & BIOMOLECULAR CHEMISTRY 15 (42) 8894 - 8903 1477-0520 2017/11 [Refereed][Not invited]
   

  We employed an azobenzene based non-nucleoside triphosphate, AzoTP, in a myosin-actin motile system and demonstrated its efficiency as an energy molecule to drive and photo-regulate the myosin-actin motile function at the macroscopic level along with an in vitro motility assay. The AzoTP in its trans state induced shortening of a glycerinated muscle fibre whilst a cis isomer had no significant effect. Direct photoirradiation of a cis-AzoTP infused muscle fibre induced shortening triggered by a locally photo-generated trans-AzoTP in the muscle fibre. Furthermore, we designed and synthesized three new derivatives of AzoTPs that served as substrates for myosin by driving and photo-regulating the myosin-actin motile function at the molecular as well as the macroscopic level with varied efficiencies.
• Asymmetric Cyclophanes Permit Access to Supercooled Nematic Liquid Crystals with Stimulus-Responsive Luminescence

  Yoshimitsu Sagara, Christoph Weder, Nobuyuki Tamaoki

  CHEMISTRY OF MATERIALS 29 (14) 6145 - 6152 0897-4756 2017/07 [Refereed][Not invited]
   

  A novel material with stimulus-responsive luminescence was created by integrating a chromophore with assembly-dependent emission properties into a liquid crystalline compound that can be kinetically trapped in a supercooled liquid crystalline state. This was achieved by synthesizing an asymmetric cyclophane containing one 1,6-bis(phenylethynyl)pyrene group. The new compound displays a broad nematic phase above similar to 110 degrees C upon being heated. Quenching to room temperature allows one to avoid crystallization, and the supercooled nematic phase is stable for at least 1 h. When the compound is heated, a phase transition from the kinetically trapped state to a crystalline state occurs, concomitant with a pronounced change in photoluminescence. The crystalline phase thus accessed shows mechanoresponsive luminescence behavior.
• Programmable dual electrochromism in azine linked conjugated polymer

  Minsu Han, Mithrabinda K. Poduval, Haijin Shin, Nobuyuki Tamaoki, Taiho Park, Yuna Kim, Eunkyoung Kim

  OPTICAL MATERIALS EXPRESS 7 (6) 2117 - 2125 2159-3930 2017/06 [Refereed][Not invited]
   

  A conjugated polymer consisting of tri-EDOT and azine groups was synthesized and explored for a programmable dual electrochromic device. Electrochemical doping (oxidation) and de-doping (reduction) resulted in the two distinct redox pairs, depending on the applied potential range. In situ spectroelectrochemical analyses revealed that the stepwise redox process of two units was associated with dual electrochromic responses: tri-EDOT unit for purple electrochromism followed by azine unit for blue electrochromism. Dual electrochromism of purple and blue was attainable at below 1.0 V which could induce the color transition upon the potential application of around +/- 1 V. Maximum coloration efficiency of 393 cm(2)/C with a response time of 1 s was obtained. (C) 2017 Optical Society of America
• Temperature-Dependent Mechanochromic Behavior of Mechanoresponsive Luminescent Compounds

  Yoshimitsu Sagara, Kazuya Kubo, Takayoshi Nakamura, Nobuyuki Tamaoki, Christoph Weder

  CHEMISTRY OF MATERIALS 29 (3) 1273 - 1278 0897-4756 2017/02 [Refereed][Not invited]
   

  Mechanoresponsive luminescent (MRL) compounds change their emission color upon mechanical treatment. Hundreds of MRL compounds have been studied, but their mechanically triggered response at elevated temperature has remained virtually unexplored. Here, we demonstrate that the temperature can have a significant influence on the mechanically induced response of MRL compounds. The photoluminescence of a new cyano-substituted oligo(p-phenylenevinylene) derivative was shown to exhibit a significant red-shift when ground at ambient temperature, whereas the same treatment at 100 degrees C leads to a hypsochromic shift. The behavior at ambient is caused by a mechanically induced phase transition from a crystalline to an amorphous solid in which the dye molecules form excimers, whereas at elevated temperature the hypsochromic shift is ascribed to a crystalline-crystalline phase transition. Such temperature-dependent MRL behavior was not previously observed, but it appears to be a general effect that is useful for sophisticated mechano-sensing materials and devices.
• Unexpected Responses of Luminescent Molecular Materials Upon Simultaneous Exposure to Mechanical Force and Heat

  Y. Sagara, K. Kubo, T. Nakamura, N. Tamaoki, C. Weder

  Chemistry of Materials 29 1273 - 1278 2017/01 [Refereed][Not invited]
  
• Mechanoresponsive luminescence and liquid-crystalline behaviour of a cyclophane featuring two 1,6-bis(phenylethynyl)pyrene groups

  Yoshimitsu Sagara, Nobuyuki Tamaoki

  RSC ADVANCES 7 (74) 47056 - 47062 2046-2069 2017 [Refereed][Not invited]
   

  Cyclophanes have been attractive targets over recent decades because of their fascinating molecular structures and inherent ability to act as supramolecular hosts. However, cyclophanes that exhibit stimuli-responsive luminescence in their condensed states are still very rare, although luminescent cyclophanes could be suitable platforms for sophisticated photofunctional molecular assembled materials. We here report that a pyrenophane featuring two p-extended pyrene groups exhibits mechanoresponsive luminescence in the solid states and shows a nematic liquid-crystalline phase at elevated temperature. Two 1,6-bis(phenylethynyl)pyrene moieties form intramolecular excimers in a diluted chloroform solution, whereas no clear intra-and/or intermolecular excimer formation was observed for the solid state accessed through slow cooling from the nematic phase. Photoluminescence spectroscopic measurements, emission lifetime measurements, and X-ray diffraction patterns confirmed that mechanical stimuli result in conversion to much less ordered molecular assembled states in which some luminophores form excimers, leading to changes in photoluminescence colours.
• A helical naphthopyran dopant for photoresponsive cholesteric liquid crystals

  Yuna Kim, Michel Frigoli, Nicolas Vanthuyne, Nobuyuki Tamaoki

  CHEMICAL COMMUNICATIONS 53 (1) 200 - 203 1359-7345 2017/01 [Refereed][Not invited]
   

  The first photoresponsive cholesteric liquid crystal comprising a photoisomerizable helical naphthopyran derivative dopant and a nematic liquid crystal is reported. An unprecedented helical twisting power switching ratio of over 90% allowed us to demonstrate multicycle rotational motion of micro-objects by UV light irradiation.
• Determination of the absolute stereostructure of a cyclic azobenzene from the crystal structure of the precursor containing a heavy element

  Reji Thomas, Nobuyuki Tamaoki

  BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY 12 1860-5397 2016/10 [Refereed][Not invited]
   

  Single crystal X-ray diffraction has been used as one of the common methods for the unambiguous determination of the absolute stereostructure of chiral molecules. However, this method is limited to molecules containing heavy atoms or to molecules with the possibility of functionalization with heavy elements or chiral internal references. Herein, we report the determination of the absolute stereostructure of the enantiomers of molecule (E)-2, which lacks the possibility of functionalization, using a reverse method, i.e., defunctionalization of its precursor of known stereostructure with bromine substitution (S-(-)-(E)-1). A reductive debromination of S-(-)-(E)-1 results in formation of one of the enantiomers of (E)-2. Using a combination of HPLC and CD spectroscopy we could safely assign the stereostructure of one of the enantiomers of (E)-2, the reduced product R-(-)-(E)-1.
• Asymmetric Dimers of Chiral Azobenzene Dopants Exhibiting Unusual Helical Twisting Power upon Photoswitching in Cholesteric Liquid Crystals

  Yuna Kim, Nobuyuki Tamaoki

  ACS APPLIED MATERIALS & INTERFACES 8 (7) 4918 - 4926 1944-8244 2016/02 [Refereed][Not invited]
   

  In this study, we synthesized asymmetric dimeric chiral molecules as photon-mode chiral switches for reversible tuning of self-assembled helical superstructures. The chiral switches bearing two mesogen units cholesterol and azobenzene moieties connected through flexible alkylenedioxy bridges were doped into nematic liquid crystals, resulting in a chiral nematic (cholesteric) phase. Under irradiation with UV light, photoisomerization of the azobenzene units led to unprecedented switching of the cholesteric pitch and helical twisting power (HTP, beta), with a higher HTP found in the cis-rich state (bent-form) than in the trans-state (rod-form). We attribute this behavior to the elongated cybotactic smectic clusters disrupting the helical orientation of the molecules in the cholesteric liquid crystals; their reversible decay and reassembly was evidenced upon sequential irradiation with UV and visible light, respectively. In addition to the photoisomerization of the azobenzene units, the odd/even parity of the alkylenedioxy linkers of the dimeric dopants also had a dramatic effect on the transitions of the cybotactic smectic domains. On the basis of the large rotational reorganization of the cholesteric helix and HTP switching (Delta beta/beta(ini) of up to 50%), we could control the macroscopic rotational motion of microsized glass rods upon irradiating the surface of a cholesteric liquid crystal film featuring a polygonal fingerprint texture using UV and visible light.
• A mechano- and thermoresponsive luminescent cyclophane

  Yoshimitsu Sagara, Yoan C. Simon, Nobuyuki Tamaoki, Christoph Weder

  CHEMICAL COMMUNICATIONS 52 (33) 5694 - 5697 1359-7345 2016 [Refereed][Not invited]
   

  The first fluorescent cyclophane with mechano- and thermoresponsive solid-state fluorescence characteristics is reported. The new cyclophane comprises two 9,10-bis(phenylethynyl)anthracene moieties that are bridged by tetraethylene glycol spacers. The stimuli-responsiveness is based on molecular assembly changes.
• Tuning the thermo- and mechanoresponsive behavior of luminescent cyclophanes

  Yoshimitsu Sagara, Christoph Weder, Nobuyuki Tamaoki

  RSC ADVANCES 6 (84) 80408 - 80414 2046-2069 2016 [Refereed][Not invited]
   

  Many cyclophanes have been investigated in dilute solution, where their internal cavities are accessible for supramolecular interactions. However, their photophysical properties in the solid state remain largely unexplored. We here report a new mechano- and thermoresponsive luminescent cyclophane that is comprised of two 9,10-bis(phenylethynyl) anthracene moieties and features two hexaethylene glycol bridges. The compound was found to exhibit a nematic liquid-crystalline phase at elevated temperature. X-ray diffraction patterns confirm that thermal and mechanical treatments induce changes in the molecular assembly, which are the basis for the observed photoluminescent color variations. The stimuli-responsive behavior of the new compound is quite different from that of a previously reported cyclophane with similar structure but shorter bridges. Thus, merely changing the ring size is an effective tool to tailor the stimuli-responsiveness and the phase behaviour of luminescent cyclophanes.
• Structure-property relationships of photoresponsive inhibitors of the kinesin motor

  Ammathnadu S. Amrutha, K. R. Sunil Kumar, Kazuya Matsuo, Nobuyuki Tamaoki

  ORGANIC & BIOMOLECULAR CHEMISTRY 14 (30) 7202 - 7210 1477-0520 2016 [Refereed][Not invited]
   

  Recently we demonstrated the photoregulation of the activity of kinesin-1 using an azobenzene-tethered peptide (azo-peptide: Azo-Ile-Pro-Lys-Ala-Ile-Gln-Ala-Ser-His-Gly-Arg-OH). To understand the mechanism behind this photoswitchable inhibition, here we studied the structure-property relationships of a range of azo-peptides through systematic variations in the structures of the peptide and azobenzene units. The vital peptide sequence for kinesin inhibition-mediated through electrostatic, hydrophobic and C-H center dot center dot center dot pi interactions-was the same as that for the self-inhibition of kinesin. We also identified substituents on the azobenzene capable of enhancing the photoswitchability of inhibition. As a result, we developed a new inhibitor featuring a relatively short peptide unit (-Arg-Ile-Pro-Lys-Ala-Ile-Arg-OH) and an azobenzene unit bearing a para-OMe group. In the trans form of its azobenzene unit, this finely tuned inhibitor stopped the kinesin-driven gliding motility of microtubules completely at a relatively low concentration, yet allowed gliding motility with a relatively high velocity in the cis form obtained after UV irradiation.
• Spatiotemporal control of kinesin motor protein by photoswitches enabling selective single microtubule regulations

  K. R. Sunil Kumar, Ammathnadu S. Amrutha, Nobuyuki Tamaoki

  LAB ON A CHIP 16 (24) 4702 - 4709 1473-0197 2016 [Refereed][Not invited]
   

  Artificial control of bio-nanomachines should have a major impact on the development of controllable transport systems for specific cargo transport on chips. Precise spatiotemporal control and local regulation of the bio-motor activity will, however, be necessary if we are to accomplish such a goal. In this study, we exploited the photoswitching properties of azobenzene-based high-energy molecules and inhibitors to control a single kinesin-driven microtubule that has potential to work as a nanocarrier for molecular cargos. In particular, we could influence the local concentration and dispersion of the microtubules at any desired position and time by irradiating a local area of the motility system at one wavelength, while irradiating the entire area at another wavelength, to enrich either cis or trans isomers of photoswitches in the selected region. Furthermore, various regulations (e.g., transporting, bending, breaking) of single microtubules were possible while almost arresting ambient microtubules-all without the need for any surface patterning.
• Fast thermal cis-trans isomerization depending on pH and metal ions of water-soluble azobenzene derivatives containing a phosphate group

  Rika Ochi, Nishad Perur, Kazutoshi Yoshida, Nobuyuki Tamaoki

  TETRAHEDRON 71 (21) 3500 - 3506 0040-4020 2015/05 [Refereed][Not invited]
   

  We observed unique thermal cis-trans isomerization properties of water-soluble azobenzene derivatives in which a phosphate group was substituted at ortho position of an azobenzene via an amide linkage. Here, we report the effect of the structure of the phosphate groups (the length and the position), pH, and metal ions on thermal cis-trans isomerization. We revealed that the water-soluble azobenzene derivatives, in which di- or tri-phosphate group was substituted at ortho position of the azobenzene via the amide linkage, showed the fast thermal isomerization in low pH condition. In addition, we showed that the effects of the metal ions on the thermal isomerization rate. (C) 2015 Elsevier Ltd. All rights reserved.
• Dynamic induction of enantiomeric excess from a prochiral azobenzene dimer under circularly polarized light

  K. Rijeesh, P. K. Hashim, Shin-ichiro Noro, Nobuyuki Tamaoki

  CHEMICAL SCIENCE 6 (2) 973 - 980 2041-6520 2015 [Refereed][Not invited]
   

  The ability to photoinduce enantiomeric excess from the chirality of circularly polarized light (CPL) is pertinent to the study of the origin of homochirality in biomolecules. Such CPL-induced reactions, including both chirality generation and formation of partial enantiomeric imbalance, from nonchiral starting compounds have been known, however, only for the conversion of diarylolefins into chiral helicenes. In this study we synthesized three different prochiral molecules, each featuring a pair of photoisomerizable phenylazo moieties arranged symmetrically upon the phenyl rings of an sp(3)-hybridized carbon atom (1), the phenyl rings of [2.2]paracyclophane (2), and the ortho positions of a phenyl ring bearing a naphthyl unit (3), and then investigated the possibility of photoinducing enantiomeric excess under CPL. Irradiation of 1-3 with light induced E <-> Z photoisomerizations of their azobenzene moieties, giving mixtures of their EE, EZ, and ZZ isomers in the photostationary state (PSS). Among these regioisomers, the EZ forms are chiral and existed as racemic mixtures of R and S stereoisomers. Upon CPL irradiation of 3, circular dichroism (CD) revealed enantiomeric enrichment of one of the EZ stereoisomers; furthermore, irradiation with r- or l-CPL gave CD signals opposite in sign, but with equal intensity, in the PSS. In contrast, 1 and 2 did not give any detectable induced CD upon CPL irradiation. These experimental results can be explained by considering the different Kuhn anisotropy factors (g) of the (R)-EZ and (S)-EZ stereoisomers of 1-3, assuming that the origin of the enantiomeric excess is the enantio-differentiating photoisomerization from EZ stereoisomers to nonchiral EE or ZZ regioisomers by r- or l-CPL. In short, we demonstrate the simultaneous induction of chirality and enantiomeric excess from a prochiral azobenzene dimer via a chiral regioisomer formed in situ upon CPL irradiation.
• A photoresponsive planar chiral azobenzene dopant with high helical twisting power

  Yuna Kim, Nobuyuki Tamaoki

  Journal of Materials Chemistry C 2 9258 - 9264 2050-7534 2014/11/21 [Not refereed][Not invited]
   

  © 2014 the Partner Organisations. A planar chiral molecule as a photon-mode chiral switch was synthesized for the reversible control of self-assembled superstructures based on doped chiral nematic liquid crystals. The chiral switch is composed of bis-hexyl substituted diphenylnaphthalene and a photoisomerizing azobenzene unit connected by ethylene spacers in a cyclic manner. Bis-hexyl substitution to the mesogenic unit promoted the chirality transfer to the host LC medium resulting in a high initial helical twisting power (HTP) and a large change in HTP by photo-isomerization of the chiral dopant. At very low doping concentrations, both reversible tuning of RGB reflection colors and rotation motion control of micro glass rods on the cholesteric liquid crystal surface were achieved.
• A photoresponsive planar chiral azobenzene dopant with high helical twisting power

  Yuna Kim, Nobuyuki Tamaoki

  JOURNAL OF MATERIALS CHEMISTRY C 2 (43) 9258 - 9264 2050-7526 2014/11 [Refereed][Not invited]
   

  A planar chiral molecule as a photon-mode chiral switch was synthesized for the reversible control of self-assembled superstructures based on doped chiral nematic liquid crystals. The chiral switch is composed of bis-hexyl substituted diphenylnaphthalene and a photoisomerizing azobenzene unit connected by ethylene spacers in a cyclic manner. Bis-hexyl substitution to the mesogenic unit promoted the chirality transfer to the host LC medium resulting in a high initial helical twisting power (HTP) and a large change in HTP by photo-isomerization of the chiral dopant. At very low doping concentrations, both reversible tuning of RGB reflection colors and rotation motion control of micro glass rods on the cholesteric liquid crystal surface were achieved.
• Complete ON/OFF Photoswitching of the Motility of a Nanobiomolecular Machine

  K. R. Sunil Kumar, Takashi Kamei, Tuyoshi Fukaminato, Nobuyuki Tamaoki

  ACS NANO 8 (5) 4157 - 4165 1936-0851 2014/05 [Refereed][Not invited]
   

  To apply motor proteins as natural nanomolecular machines to transporting systems in nanotechnology, complete temporal control over ON/OFF switching of the motility is necessary. We have studied the photoresponsive inhibition properties of azobenzene-tethered peptides for regulation of kinesin-microtubule motility. Although a compound containing a peptide having an amino acid sequence derived from the kinesin's C-terminus (a known inhibitor of kinesin's motor domain) and also featuring a terminal azobenzene unit exhibited an inhibition effect, the phototunability of this behavior upon irradiation with UV or visible light was only moderate. Unexpectedly, newly synthesized peptides featuring the reverse sequence of amino acids of the C-terminus of kinesin exhibited excellent photoresponsive inhibition. In particular, azobenzene-CONH-IPKAIQASHGR completely stopped and started the motility of kinesin-microtubules in Its trans- and cis-rich states, respectively, obtained after irradiation with visible and UV light, respectively. A gliding motility system containing this photoresponsive Inhibitor allowed in situ control of the motion of microtubules on a kinesin-coated glass substrate. It is expected that the present results on the photoresponsive nanomotor system open up new opportunities to design nanotransportation systems.
• Reversible control of F-1-ATPase rotational motion using a photochromic Cross Mark ATP analog at the single molecule level

  Ei-Ichiro Sunamura, Takashi Kamei, Hiroki Konno, Nobuyuki Tamaoki, Toru Hisabori

  BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS 446 (1) 358 - 363 0006-291X 2014/03 [Refereed][Not invited]
   

  Motor enzymes such as F-1-ATPase and kinesin utilize energy from ATP for their motion. Molecular motions of these enzymes are critical to their catalytic mechanisms and were analyzed thoroughly using a single molecule observation technique. As a tool to analyze and control the ATP-driven motor enzyme motion, we recently synthesized a photoresponsive ATP analog with a p-tert-butylazobenzene tethered to the 2' position of the ribose ring. Using cis/trans isomerization of the azobenzene moiety, we achieved a successful reversible photochromic control over a kinesin-microtubule system in an in vitro motility assay. Here we succeeded to control the hydrolytic activity and rotation of the rotary motor enzyme, F1-ATPase, using this photosensitive ATP analog. Subsequent single molecule observations indicated a unique pause occurring at the ATP binding angle position in the presence of cis form of the analog. (c) 2014 Elsevier Inc. All rights reserved.
• Dicholesteryl icosanedioate as a glass-forming cholesteric liquid crystal: properties, additive effects and application in color recording

  Yuna Kim, Momoyo Wada, Nobuyuki Tamaoki

  JOURNAL OF MATERIALS CHEMISTRY C 2 (10) 1921 - 1926 2050-7526 2014 [Refereed][Not invited]
   

  A cholesteric ester dimer - dicholesteryl icosanedioate - was examined for color imaging. Cholesterol was introduced as one of the dopants which performed an important role reducing phase transition temperatures. The other dopants, 4,4'-dialkoxyazobenzene and 4,4'-dialkoxybiphenyl promoted formation of smectic domains in cholesteric phases which resulted in the expansion of the reflective band shift over the whole visible region. In particular, the photo-responsive dopant 4,4'-dialkoxyazobenzene allowed us to realize reversible RGB color tuning of the cholesteric film by both photon and thermal modes. The trans-cis photoisomerization led to a cholesteric pitch change which resulted in reflective color change, and recorded optical images that have been stable for more than 8 months in a glassy solid film state.
• Thieno[3,2-b]thiophene derivatives exhibiting semiconducting liquid-crystalline phases at lower temperatures

  Yuna Kim, Masahiro Funahashi, Nobuyuki Tamaoki

  RSC ADVANCES 4 (105) 60511 - 60518 2046-2069 2014 [Refereed][Not invited]
   

  We synthesized novel liquid crystalline semiconductors bearing an extended pi-conjugated mesogen based on thieno[3,2-b]thiophene, which exhibit high solubility and low phase transition temperature. In particular, lateral methyl substitution to the mesogenic unit led to the formation of efficiently self-organized LC domains at lower temperature than that of reported liquid crystalline thieno[3,2-b]thiophene derivatives. Smectic A and smectic E phases were observed by a polarizing optical microscope over a wide temperature range between 75 and 125 degrees C. Hole mobility was determined by the time-of-flight (TOF) method, and calculated up to 2 x 10(-3) cm(2) V-1 s(-1). Herein we report the synthesis, thermophysical and carrier transport properties of novel thieno[3,2-b]thiophene based liquid-crystalline semiconductors.
• A non-nucleoside triphosphate for powering kinesin-microtubule motility with photo-tunable velocity

  Nishad Perur, Masao Yahara, Takashi Kamei, Nobuyuki Tamaoki

  Chemical Communications 49 (85) 9935 - 9937 1359-7345 2013/11/04 [Refereed][Not invited]
   

  Three non-nucleoside triphosphates, one containing an azobenzene moiety, power a kinesin-microtubule system with high motile activity, with an observed maximum velocity of almost half of that obtained with ATP. The cis-trans photoisomerization of the azobenzene unit allows reversible and repeated control over the motile properties of kinesin. © 2013 The Royal Society of Chemistry.
• Supramolecular self-assembly of a novel hydrogen-bonded cholesteric liquid crystal exhibiting macromolecular behaviour

  Mahdi Roohnikan, Morteza Ebrahimi, Seyed Reza Ghaffarian, Nobuyuki Tamaoki

  LIQUID CRYSTALS 40 (3) 314 - 320 0267-8292 2013/03 [Refereed][Not invited]
   

  The mesomorphic, thermoptic and glass-forming properties of 4-[6-((cholesteryloxy) carbonyl)oxy hexyloxy] benzoic acid (Ch-BA) have been investigated as a novel supramolecular hydrogen-bonded cholesteric mesogen. Fourier transform infrared and H-1 nuclear magnetic resonance studies have confirmed the chemical structure and the hydrogen-bond formation between the mesogens. According to polarising optical microscope observations, the compound exhibited smectic and chiral nematic phases. Differential scanning calorimetry indicated an unexpected glass transition (T-g) around 32 degrees C and a liquid crystalline region between 32 and 122 degrees C, in which the cholesteric phase appeared at 80 degrees C. As a result of the glass formation, samples of Ch-BA which were rapidly cooled below the T-g were found to preserve the long-range ordering of the liquid crystalline state and retained the iridescent colours of the cholesteric phase. These results led to the conclusion that the formation of identical dimers by intermolecular hydrogen-bonding of the terminal carboxylic acids accompanying the lateral packing of the rigid cores, built a trimeric arrangement and this was responsible for the macromolecular behaviour of Ch-BA, despite its relatively simple structure and low molecular weight.
• Chirality induction by E-Z photoisomerization in [2,2]paracyclophane- bridged azobenzene dimer

  P. K. Hashim, Meethale C. Basheer, Nobuyuki Tamaoki

  Tetrahedron Letters 54 (2) 176 - 178 0040-4039 2013/01/09 [Refereed][Not invited]
   

  We designed and synthesized a new prochiral molecule in which two azobenzene moieties were embedded in [2,2]paracyclophane and showed the chirality induction by E-Z photoisomerization. We also demonstrated the on/off switching of asymmetry by irradiation and reflux respectively. © 2012 Elsevier Ltd. All rights reserved.
• Influence of a Change in Helical Twisting Power of Photoresponsive Chiral Dopants on Rotational Manipulation of Micro-Objects on the Surface of Chiral Nematic Liquid Crystalline Films

  Reji Thomas, Yohei Yoshida, Takehito Akasaka, Nobuyuki Tamaoki

  CHEMISTRY-A EUROPEAN JOURNAL 18 (39) 12337 - 12348 0947-6539 2012/09 [Refereed][Not invited]
   

  Herein we report a group of five planar chiral molecules as photon-mode chiral switches for the reversible control of the self-assembled superstructures of doped chiral nematic liquid crystals. The chiral switches are composed of an asymmetrically substituted aromatic moiety and a photoisomerizing azobenzene unit connected in a cyclic manner through methylene spacers of varying lengths. All the molecules show conformational restriction in the rotation of the asymmetrically substituted aromatic moiety in both the E and Z states of the azobenzene units resulting in planar chirality with separable enantiomers. Our newly synthesized compounds in pure enantiomeric form show high helical twisting power (HTP) in addition to an improved change in HTP between the E and Z states. The molecule with a diphenylnaphthalene unit shows the highest ever known initial helical twisting power among chiral dopants with planar chirality. In addition to the reversible tuning of reflection colors, we employed the enantiomers of these five compounds in combination with four nematic liquid crystalline hosts to study their properties as molecular machines; the change in HTP of the chiral dopant upon photoisomerization induces rotation of the texture of the liquid crystal surfaces. Importantly, this study has revealed a linear dependence of the ratio of the difference between HTPs before and after irradiation against the absolute value of the initial HTP, not the absolute value of the change in helical twisting power between two states, on the angle of rotation of micro-objects on chiral nematic liquid crystalline films. This study has also revealed that a change in irradiation intensity does not affect the maximum angle of rotation, but it does affect the speed of rotational reorganization of the cholesteric helix.
• 3PT102 Driving and Reversible Photo-control of Motility of a Kinesin/Microtubule System by a Novel Photochromic ATP Analogue(The 50th Annual Meeting of the Biophysical Society of Japan)

  Kamei Takashi, Fukaminato Tuyoshi, Tamaoki Nobuyuki

  Seibutsu Butsuri 一般社団法人 日本生物物理学会 52 S157  2012
• Fluorescence photoswitching based on a photochromic pK(a) change in an aqueous solution

  Tuyoshi Fukaminato, Emi Tateyama, Nobuyuki Tamaoki

  CHEMICAL COMMUNICATIONS 48 (88) 10874 - 10876 1359-7345 2012 [Refereed][Not invited]
   

  Reversible fluorescence photoswitching of RSA-AZO dyad 1 was clearly demonstrated in an acidic aqueous solution. The fluorescence photoswitching mechanism is based on the reversible ring opening/closing reactions of the RSA unit induced by a photochromic pK(a) change along with the photoisomerization of the AZO unit.
• A photochromic ATP analogue driving a motor protein with reversible light-controlled motility: controlling velocity and binding manner of a kinesin-microtubule system in an in vitro motility assay

  Takashi Kamei, Tuyoshi Fukaminato, Nobuyuki Tamaoki

  CHEMICAL COMMUNICATIONS 48 (61) 7625 - 7627 1359-7345 2012 [Refereed][Not invited]
   

  We synthesized two photochromic ATP analogues (ATP-Azos) featuring azobenzene derivatives tethered at the 2' position of the ribose ring. In the presence of the ATP-Azo tethering p-tert-butylazobenzene, we observed reversible photo-control of the motility, velocity and binding manner, of a kinesin-microtubule system in an in vitro motility assay.
• Dynamic photo-control of kinesin on a photoisomerizable monolayer - hydrolysis rate of ATP and motility of microtubules depending on the terminal group

  M. K. Abdul Rahim, Takashi Kamei, Nobuyuki Tamaoki

  ORGANIC & BIOMOLECULAR CHEMISTRY 10 (16) 3321 - 3331 1477-0520 2012 [Refereed][Not invited]
   

  The reversibly and repeatedly altered gliding motility of microtubules driven by kinesin on the photoresponsive monolayer surface is studied. It was confirmed that an azobenzene monolayer surface needs to have free amino terminal groups for the successful dynamic control of the motility of microtubule. The surface of the azobenzene monolayer with terminal amino groups can dynamically control the ATP hydrolysis activity of kinesin which resulted in the change in motility of the microtubules.
• Reversible Photogeneration of a Stable Chiral Radical-Pair from a Fast Photochromic Molecule

  Sayaka Hatano, Kana Fujita, Nobuyuki Tamaoki, Takashi Kaneko, Takuya Nakashima, Masanobu Naito, Tsuyoshi Kawai, Jiro Abe

  JOURNAL OF PHYSICAL CHEMISTRY LETTERS 2 (21) 2680 - 2682 1948-7185 2011/11 [Refereed][Not invited]
   

  The photochromic naphthalene-bridged imidazole dimer containing a naphthyl moiety that tethers two triarylimidazole units shows instantaneous coloration upon exposure to UV light and rapid fading in the dark. In this work, we demonstrate the formation of a stable chiral radical-pair that exhibits no photoracemization even by repeated photochromic cycles. The photogenerated radical-pair from the imidazole dimer exhibits the Cotton effect in the visible light region, indicating the retention of the enantiomeric conformation of the radical-pair. This result suggests that the chirality resulting from the binaphthyl moiety induces exciton coupling between the two radical chromophores by through-space interaction.
• Temperature-Independent Hole Mobility in Field-Effect Transistors Based on Liquid-Crystalline Semiconductors

  Masahiro Funahashi, Fapei Zhang, Nobuyuki Tamaoki

  IEICE TRANSACTIONS ON ELECTRONICS E94C (11) 1720 - 1726 0916-8524 2011/11 [Refereed][Not invited]
   

  Thin-film transistors based on Liquid-crystalline phenylterthiophenes, 3-TTPPh-5 and 3-TTPPhF4-6 are fabricated with a spin-coating method. The devices exhibit p-type operation with the mobility on the order of 10(-2) cm(2)V(-1)s(-1). The field-effect mobilities of the transistors using 3-TTPPh-5 and 3-TTPPhF4-6 are almost independent of the temperature above room temperature. In particular, the temperature range in which the mobility is constant is between 230 and 350 K for 3-TTPPh-5.
• Dynamic Photocontrol of the Gliding Motility of a Microtubule Driven by Kinesin on a Photoisomerizable Mono layer Surface

  M. K. Abdul Rahim, Tuyoshi Fukaminato, Takashi Kamei, Nobuyuki Tamaoki

  LANGMUIR 27 (17) 10347 - 10350 0743-7463 2011/09 [Refereed][Not invited]
   

  The gliding motility of microtubules driven by kinesin on the surface of an azobenzene monolayer presenting lysine terminal groups is reversibly and repeatedly altered upon photoisomerization of the monolayer.
• Induction of Molecular Chirality by Circularly Polarized Light in Cyclic Azobenzene with a Photoswitchable Benzene Rotor

  P. K. Hashim, Reji Thomas, Nobuyuki Tamaoki

  CHEMISTRY-A EUROPEAN JOURNAL 17 (26) 7304 - 7312 0947-6539 2011/06 [Refereed][Not invited]
   

  New phototriggered molecular machines based on cyclic azobenzene were synthesized in which a 2,5-dimethoxy, 2,5-dimethyl, 2,5-difluorine or unsubstituted-1,4-dioxybenzene rotating unit and a photoisomerizable 3,3'-dioxyazobenzene moiety are bridged together by fixed bismethylene spacers. Depending upon substitution on the benzene moiety and on the E/Z conformation of the azobenzene unit, these molecules suffer various degrees of restriction on the free rotation of the benzene rotor. The rotation of the substituted benzene rotor within the cyclic azobenzene cavity imparts planar chirality to the molecules. Cyclic azobenzene 1, with methoxy groups at both the 2- and 5-positions of the benzene rotor, was so conformationally restricted that free rotation of the rotor was prevented in both the E and Z isomers and the respective planar chiral enantiomers were resolved. In contrast, compound 2, with 2,5-dimethylbenzene as the rotor, demonstrated the property of a light-controlled molecular brake, whereby rotation of the 2,5-dimethylbenzene moiety is completely stopped in the E isomer (brake ON, rotation OFF), while the rotation is allowed in the Z isomer (brake OFF, rotation ON). The cyclic azobenzene 3, with fluorine substitution on the benzene rotor, was in the brake OFF state regardless of E/Z photoisomerization of the azobenzene moiety. More interestingly, for the first time, we demonstrated the induction of molecular chirality in a simple monocyclic azobenzene by circular-polarized light. The key characteristics of cyclic azobenzene 2, that is, stability of the chiral structure in the E isomer, fast racemization in the Z isomer, and the circular dichroism of enantiomers of both E and Z isomers, resulted in a simple reversible enantio-differentiating photoisomerization directly between the E enantiomers. Upon exposure to r- or l-circularly polarized light at 488 nm, partial enrichment of the (S)- or (R)-enantiomers of 2 was observed.
• Single-Molecule Fluorescence Photoswitching of a Diarylethene-Perylenebisimide Dyad: Non-destructive Fluorescence Readout

  Tuyoshi Fukaminato, Takao Doi, Nobuyuki Tamaoki, Katsuki Okuno, Yukihide Ishibashi, Hiroshi Miyasaka, Masahiro Irie

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 133 (13) 4984 - 4990 0002-7863 2011/04 [Refereed][Not invited]
   

  Single-molecule fluorescence photoswitching plays an essential role in ultrahigh-density (Tbits/inch(2)) optical memories and super-high-resolution fluorescence imaging. Although several fluorescent photochromic molecules and fluorescent proteins have been applied, so far, to optical memories and super-high-resolution imaging, their performance is unsatisfactory because of the absence of "non-destructive fluorescence readout capability". Here we report on a new molecular design principle of a molecule having non-destructive readout capability. The molecule is composed of acceptor photochromic diarylethene and donor fluorescent perylenebisimide units. The fluorescence is reversibly quenched when the diarylethene unit converts between the open- and the closed-ring isomers upon irradiation with visible and UV light. The fluorescence quenching is based on an electron transfer from the donor to the acceptor units. The fluorescence photoswitching and non-destructive readout capability were demonstrated in solution (an ensemble state) and at the single-molecule level. Femtosecond time-resolved transient and fluorescent lifetime measurements confirmed that the fluorescence quenching is attributed to the intramolecular electron transfer.
• Synthesis, Gelation Properties and Photopolymerization of Macrocyclic Diacetylenedicarboxamides Derived from L-Glutamic Acid and trans-1,4-Cyclohexanediol

  Jun'ichi Nagasawa, Masaru Yoshida, Nobuyuki Tamaoki

  EUROPEAN JOURNAL OF ORGANIC CHEMISTRY 2011 (12) 2247 - 2255 1434-193X 2011/04 [Refereed][Not invited]
   

  Novel macrocyclic diacetylene compounds derived from L-glutamic acid and trans-1,4-cyclohexanediol have been synthesized and their gelation ability, photopolymerizability and aggregation state have been studied. Most of the compounds with decyl groups gelatinize hexane, cyclohexane, cyclohexene and carbon tetrachloride. Some of the compounds also gelatinize toluene and 2-propanol. An FTIR spectroscopy study indicated hydrogen-bonding in the gel state. An X-ray crystallographic analysis of one of the macrocyclic compounds with methyl groups demonstrated a tubular assembly based on the face-to-face packing of the macrocyclic rings as a result of intermolecular hydrogen-bonding. Upon photoirradiation, most of the gels changed their hue from colourless to red or orange, which suggests photopolymerization of the diacetylene moieties.
• Induction of Point Chirality by E/Z Photoisomerization

  P. K. Hashim, Nobuyuki Tamaoki

  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 50 (49) 11729 - 11730 1433-7851 2011 [Refereed][Not invited]
  
• Synthesis and efficient circularly polarized light emission of an optically active hyperbranched poly(fluorenevinylene) derivative

  Juin-Meng Yu, Takeshi Sakamoto, Kento Watanabe, Seiichi Furumi, Nobuyuki Tamaoki, Yun Chen, Tamaki Nakano

  CHEMICAL COMMUNICATIONS 47 (13) 3799 - 3801 1359-7345 2011 [Refereed][Not invited]
   

  An optically active, hyperbranched poly(fluorenevinylene) derivative was synthesized by polymerization of (-)-2,4,7-tris(bromomethyl)-9-neomenthyl-9-pentylfluorene. A spin-coated film sample of the polymer exhibited efficient circularly polarized light (CPL) emission in the visible range of 400-700 nm on photo excitation even without annealing processes leading to chain ordering.
• Chirality transfer from chiral solvents and its memory in an azobenzene derivative exhibiting photo-switchable racemization

  Reji Thomas, Nobuyuki Tamaoki

  ORGANIC & BIOMOLECULAR CHEMISTRY 9 (15) 5389 - 5393 1477-0520 2011 [Refereed][Not invited]
   

  The transfer and dynamic fixation of chirality in cyclic azobenzenes using R-(+)-1-phenylethylalcohol (R-PEA) and S-(-)-1-phenylethylalcohol (S-PEA) as solvents or additives are investigated. The cyclic azobenzenes used in this study carry a 1,5-dioxynaphthalene moiety as rotating unit, connected to the photoisomerizing (E-Z) azobenzene unit with spacers of varying lengths. With suitable lengths of the spacers the molecules exhibit stable enantiomers originated from the element of planar chirality in the E form due to the stopped rotation of the rotor, while in the Z form the allowed rotation results in racemization. The CD spectra of racemic compounds in the E form in chiral solvents were inert or almost negligible before irradiation, while 366 nm irradiation causing E-Z photoisomerization resulted in induction of clear CD bands. The thermal or photochemical reverse Z E isomerization causes a change in the CD spectra to new ones which are reasonably matching with the spectra of the pure enantiomers recorded in non-chiral solvents. The obtained new CD spectra are maintained even in a racemic solvent system attained by the dilution with an equal amount of chiral solvent of opposite stereostructure. These results indicate that the chirality is transferred from the chiral solvents or additives to the racemizing Z form of cyclic azobenzene and it is fixed in the non-racemizing E form. The molecule without racemization in both E and Z forms did not show any significant induced CD bands irrespective of E-Z isomerizations. The molecule showing racemization in E and Z forms just shows the non-fixed induced CD. The property of photo-switchable racemization is necessary for the effective transfer and temporal fixation of the chirality in this type of chirality sensors.
• Tuning of solubility and gelation ability of oligomeric electrolyte by anion exchange

  Nagatoshi Koumura, Hajime Matsumoto, Hajime Kawanami, Nobuyuki Tamaoki, Masaru Yoshida

  POLYMER JOURNAL 42 (9) 759 - 765 0032-3896 2010/09 [Refereed][Not invited]
   

  To tune the miscibility of the gel-forming oligomeric electrolyte, we examined anion exchange reactions using appropriate ammonium or alkali-metal salts. Nine oligomeric electrolytes with different anions were obtained in high yields by the reactions. The solubility of these oligomeric electrolytes in organic solvents was carefully tested. Although the starting material with chloride as a counter anion was not soluble in any organic solvents, excellent miscibility and gelation ability of the oligomeric electrolytes with different anions were consequently observed with dipolar protophilic and aprotic solvents such as N,N-dimethylformamide, dimethylsulfoxide and N, N-dimethylacetamide. Furthermore, ionogels based on aliphatic ionic liquids were readily formed using the oligomer with bis(trifluoromethanesulfonyl) amide anion at a 40 g l(-1) concentration. It is remarkable that the ionic conductivity of the above-mentioned ionogels is almost identical to that of neat ionic liquids, despite the significant increase in the apparent viscosity. This study shows a novel and convenient approach to gelators for multiple solvents. Polymer Journal (2010) 42, 759-765; doi:10.1038/pj.2010.65; published online 4 August 2010
• Reversible photo-regulation of the properties of liquid crystals doped with photochromic compounds

  Nobuyuki Tamaoki, Takashi Kamei

  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 11 (2-3) 47 - 61 1389-5567 2010/09 [Refereed][Not invited]
   

  Photochromic reactions in liquid crystals induce re-alignments of the host molecules, accompanied by changes in the optical properties and various other properties of the materials. Since the first report by Sackmann in 1971, various combinations of photochromic compounds and liquid crystals have been studied to elicit the reversible photo-regulated changes of various properties. In this report we review the advances of this field during the past 5 years, which include the creation of mechanical functions, the regulation of novel optical properties, cholesteric liquid crystals doped with azobenzene compounds in high concentrations, the regulation of ferroelectric liquid crystals, the induction of chirality by circularly polarized light, photoresponsive chiral dopants, and the photo-regulation of the oscillation wavelength of mirrorless lasers. (C) 2010 Elsevier B.V. All rights reserved.
• Structure of Silver(I) Complex Prepared from Azobenzenonaphthalenophane, Photochemical Coordination Change of Silver(I) and Silver(I)-Induced Acceleration of Z-E Thermal Isomerization of Azobenzene Unit

  Yoshimi Oka, Nobuyuki Tamaoki

  INORGANIC CHEMISTRY 49 (11) 4765 - 4767 0020-1669 2010/06 [Refereed][Not invited]
   

  A Ag(I) complex was prepared from azobenzenonaphthalenophane as a photoreactive multidentate ligand. The coordination of Ag(I) was reversibly controlled by photoisomerization of the azobenzene unit, and at the same time, Ag(I) accelerated the Z-E thermal isomerization of the azobenzene unit.
• Flexible field-effect transistors from a liquid crystalline semiconductor by solution processes

  Fapei Zhang, Masahiro Funahashi, Nobuyuki Tamaoki

  ORGANIC ELECTRONICS 11 (3) 363 - 368 1566-1199 2010/03 [Refereed][Not invited]
   

  We have fabricated the flexible field-effect transistors based on the liquid crystalline phenylterthiophene derivative via a solution process. A dielectric layer of polyvinyl alcohol (PVA) are deposited on a polyimide sheet substrate by a spin-coating method and then the thin film of 5-propyl-5 ''-(4-pentylphenyl)-2,2': 5',2 ''-terthiophene is fabricated from its chlorobenzene solution on the dielectric layer by spin-coating or solution sheared deposition method. The fabricated devices exhibit good electrical performance with a hole mobility of up to 0.05 cm(2) V-1 s(-1) as well as excellent mechanical flexibility. The performance does not degrade at the external strain reached 3%. Our results demonstrate that liquid crystalline semiconductors are promising materials for low-cost flexible electronic devices. (C) 2009 Elsevier B.V. All rights reserved.
• Photoisomerization of Azobenzene Units Controls the Reversible Dispersion and Reorganization of Fibrous Self-Assembled Systems

  Yoko Matsuzawa, Nobuyuki Tamaoki

  JOURNAL OF PHYSICAL CHEMISTRY B 114 (4) 1586 - 1590 1520-6106 2010/02 [Refereed][Not invited]
   

  N-(L-valyl-L-valyl-L,-valyl)azobenzene-4-carboxamide [AZO(LVal)(3)] is a low molecular weight gelator that forms a photo functional Fibrous assembled system; this assembly undergoes dispersion/reorganization upon trans-to-cis photoisomerization, which, as a result of the breaking and reforming of hydrogen bonds, induces reversible sol-gel transitions. In this paper, we describe the mechanism by which azobenzene isomerization induces the breaking and reorganization of these assembled systems. We applied Fourier transform infrared spectroscopy to investigate the effect of the irradiation time on the change in absorption intensity in the amide I region. The lifetime of the cis isomer influences the photoinduced breaking and reforming of hydrogen bonds between trivalyl units. Because the cis isomer of AZO(LVal)(3) had a long lifetime, its assemblies underwent reversible phototriggered dispersion and organization. In contrast. the lifetime of the cis isomer of 4'-dimeethylamino-N-(L-valyl-L-valyl-L-valyl)azobenzene-4-carboxmide [PMR(Lval)(3)] was too short to disrupt the hydrogen bonds in its fibrous self-assembled system.
• Glass-Forming Cholesteric Liquid Crystal Oligomers for New Tunable Solid-State Laser

  Seiichi Furumi, Nobuyuki Tamaoki

  ADVANCED MATERIALS 22 (8) 886 - + 0935-9648 2010/02 [Refereed][Not invited]
   

  A new potential utility of glass-forming cholesteric liquid crystal (G-CLC) oligomers for application in tunable solid-state laser is presented. The G-CLC is capable of tuning the photonic band gaps (PBGs) by way of the annealing temperature and preserving the tuned PBGs by a subsequent supercooling treatment. This G-CLC film enables the facile fabrication of a continuously gradated PGB structure and, thus, the continuous tuning of a single laser-emission peak (see figure).
• Fluorescence photoswitching of a diarylethene-perylenebisimide dyad based on intramolecular electron transfer

  Tuyoshi Fukaminato, Masaaki Tanaka, Takao Doi, Nobuyuki Tamaoki, Tetsuro Katayama, Arabinda Mallick, Yukihide Ishibashi, Hiroshi Miyasaka, Masahiro Irie

  PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES 9 (2) 181 - 187 1474-905X 2010 [Refereed][Not invited]
   

  A fluorescent photochromic molecule, which is composed of a photochromic diarylethene (DE) and a fluorescent perylenebisimide (PBI), was synthesized and its fluorescence photoswitching was studied. The fluorescence quantum yield of the open-ring isomer is constant irrespective of solvent polarity, while that of the closed-ring isomer decreases with an increase in the dielectric constant of solvents. Femtosecond time-resolved transient and fluorescence lifetime measurements revealed that the fluorescence quenching of the closed-ring isomer is attributed to the intramolecular electron transfer from the PBI chromophore to the DE unit.
• A Light-Controlled Molecular Brake with Complete ON-OFF Rotation

  Meethale C. Basheer, Yoshimi Oka, Manoj Mathews, Nobuyuki Tamaoki

  CHEMISTRY-A EUROPEAN JOURNAL 16 (11) 3489 - 3496 0947-6539 2010 [Refereed][Not invited]
   

  A light-controlled molecular machine based on cyclic azobenzenophanes consisting of a dioxynaphthalene rotating unit and a photoisomerizable dioxyazobenzene unit bridged by methylene spacers is reported. In compounds 1 and 2, 1,5- and 2,6-dioxynaphthalene moieties, respectively, are linked to p-dioxyazobenzene by different methylene spacers (n=2 in la and 2; n=3 in 1b), whereas a 1,5-dioxynaphthalene moiety is bonded to m-dioxyazobenzene by bismethylene spacers in 3. In 1b and 2, the naphthalene ring can rotate freely in both the trans and cis states at room temperature. The rotation speed can be controlled either by photoinduced reversible trans cis (E-Z) isomerization of the azobenzene or by keeping the system at low temperature, as is evident from its NMR spectra. Furthermore, for the first time, we demonstrate a light-controlled molecular brake, wherein the rotation of the naphthalene moiety through the cyclophane is completely OFF in the trans isomer of compound 3 due to its smaller cavity size. Such restricted rotation imparts planar chirality to the molecule, and the corresponding enantiomers could be resolved by chiral HPLC. However, the rotation of the naphthalene moiety is rendered ON in the cis isomer due to its increased cavity size, and it is manifested experimentally by the racemization of the separated enantiomers by photoinduced E-Z isomerization.
• Flexible Field-Effect Transistors Based on a Liquid-Crystalline Semiconductor Fabricated by the Solution Shared-Deposition Method

  Masahiro Funahashi, Fapei Zhang, Nobuyuki Tamaoki

  IDW'10: PROCEEDINGS OF THE 17TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3 1705 - 1708 1883-2490 2010 [Refereed][Not invited]
   

  Thin-film transistors based on Liquid-crystalline phenylterthiophene, 3-TTP-Ph-5 were fabricated with a solution-shared deposition method. The transistors on Si/SiO2 substrates exhibit the field-effect mobility of the hole reached 8x10-2 cm(2)V(-1)s(-1) with the on/off ratio of 10(7). The carrier mobility and the on/off ratio of the field-effect transistors fabricated on a polyimide films improved to be 5x10(-2) cm(2)V(-1)s(1) and 10(5), respectively. Their carrier mobilities are retained when the strain reaches 3 %.
• Indane-1,3-dione and cholesterol containing butadione derivatives: Photoresponsive liquid crystalline glasses for imaging applications

  N. S. Saleesh Kumar, Shibu Abraham, K. Vijayaraghavan Ratheesh, Nobuyuki Tamaoki, Seiichi Furumi, Suresh Das

  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 207 (1) 73 - 78 1010-6030 2009/09 [Refereed][Not invited]
   

  Synthesis, thermo-optical and glass forming properties of a series of photoresponsive luminescent mesogenic materials containing a butadiene moiety linked to a cholesterol group (CBIN, CBIN8 and CBIN12) as well as colour imaging devices based on them are described. These molecules exhibited relatively high fluorescence quantum efficiency in the solid and liquid crystalline states. The cholesteric phase was observed to be the major phase in these molecules and the pitch of cholesteric helix was sensitive to external stimuli such as temperature and light, making it possible to tune their iridescent colour in the visible region. The colour reflected by the cholesteric films could be stabilized by converting them to the glassy state by sudden cooling from their cholesteric phase to similar to 0 degrees C. Selective exposure of the material in its liquid crystalline phase to light resulted in trans-cis photoisomerization of the butadiene chromophore. Consequently the pitch of the irradiated portion changed depending upon the intensity of the illuminating light. The coloured images thus formed could be stored for long periods by converting the films to glasses by sudden cooling. The images stored in the glassy state were stable over long periods of time (>one year). (C) 2008 Elsevier BY. All rights reserved.
• Drastic solvent effect on thermal back reaction of spiroperimidine photochromic compounds

  Yasuo Norikane, Riju Davis, Yoshinobu Nishimura, Tatsuo Arai, Nobuyuki Tamaoki

  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 205 (2-3) 116 - 121 1010-6030 2009/06 [Refereed][Not invited]
   

  The photochromic behavior of two spiroperimidine compounds, 2,3-dihydro-2-spiro-7'-(8'-imino-7',8'-dihydronaphthalen-1'-amine)perimidine, PNI and 2,3-dihydro-2-spiro-4'-[8'-aminonaphthalen-1'(4H)-one]perimidine, PNO-p has been studied by absorption and transient absorption spectroscopies. Both PNI and PNO-p exhibit extremely large solvent effect on the thermal back reaction from the colored (open) to the initial (close) state. The lifetime of the colored state ranges from 600 mu s (methanol) to 22 days (acetonitrile) at room temperature. The relative energies of isomers have been estimated by the DFT calculations. (C) 2009 Elsevier B.V. All rights reserved.
• 螺旋構造を持つ液晶性半導体

  舟橋 正浩, 玉置信之

  光技術コンタクト 2009年2月号p84-89 2009 (2) 84-89  2009/02 [Refereed][Not invited]
  
• [2+2] Photodimerization and photopolymerization of diphenylhexatriene crystals utilizing perfluorophenyl-phenyl stacking interactions

  Yoriko Sonoda, Midori Goto, Seiji Tsuzuki, Haruhisa Akiyama, Nobuyuki Tamaoki

  JOURNAL OF FLUORINE CHEMISTRY 130 (2) 151 - 161 0022-1139 2009/02 [Refereed][Not invited]
   

  Irradiation of the crystal of 1-perfluorophenyl-6-phenyl-1,3,5-hexatriene (1), the 1:1 cocrystal of 1,6diphenyl-1,3,5-hexatriene (2) and 1,6-bis(perfluorophenyl)-1,3,5-hexatriene (3) (2/3), and crystal 3 gave a mixture of dimer, trimer and higher oligomers that was soluble in common organic solvents. The highest molecular weight was 5000-8000 (the degree of polymerization = 15-20). The order of reactivity was 1 > 2/3 >> 3. The reaction of I was relatively efficient compared to typical organic crystals. The conversion reached 100% after 3 h irradiation. In each case, the regio- and stereoselectivity in the photodimerization was high, whereas in the formation of trimer and higher oligomers, the selectivity was much lower. The main dimer was spectroscopically identified to be the face-to-face dimer formed by the [2 + 2] cycloaddition at the 1,2-position of the triene double bonds. The photoproducts from 1 and 2/3 were amorphous, as evidenced by powder X-ray diffraction and polarizing optical microscopy. This is probably due to the nonplanar and bulky structures of the cyclobutane products. The photodimerization and polymerization are considered to be non-topochemical reactions. (C) 2008 Elsevier B.V. All rights reserved.
• Thin-film transistors based on liquid-crystalline tetrafluorophenylter thiophene derivatives: thin-film structure and carrier transport

  Fapei Zhang, Masahiro Funahashi, Nobuyuki Tamaoki

  ORGANIC ELECTRONICS 10 (1) 73 - 84 1566-1199 2009/02 [Refereed][Not invited]
   

  The authors fabricated thin films by solution processes using liquid-crystalline (LC) semiconductors, 5-alkyl-5 ''-(4-hexyltetrafluorophenyl)-2,2':5',2 ''-terthiophene (2-5). Films of 5-propy 1-5 ''-(4-hexyl tetrafluorophenyl)-2,2': 5',2 ''-terthiophene (2) show similar molecular packing as their non-fluorinated counterparts. However, the degree of molecular packing ordering from X-ray diffraction measurement is higher, and the films exhibit a more crystal-like structure. Moreover, fluorination has a remarkable effect on their mesomorphic behaviors. Films of 2 consist of large size LC domains (in the range of 100 pm) at room temperature. Thin-film transistors (TFTs) of 2 show p-type operation with good hole mobility up to 0.027 cm(2)/Vs as well as improved operation stability under ambient conditions and high on/off ratio. Tetrafluorophenyl substitution leads to lowering of HOMO energy by 0.15 eV for 2 and 0.35 eV for 5, resulting in operation stability. Variable-temperature current-voltage measurements indicate intrinsic carrier transport in films of 2. (C) 2008 Elsevier B.V. All rights reserved.
• Visible-Light Photocontrol of (E)/(Z) Isomerization of the 4-(Dimethylamino)azobenzene Pseudo-Nucleotide Unit Incorporated into an Oligonucleotide and DNA Hybridization in Aqueous Media

  Takashi Kamei, Haruhisa Akiyama, Hisayuki Morii, Nobuyuki Tamaoki, Taro Q. P. Uyeda

  NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 28 (1) 12 - 28 1525-7770 2009 [Refereed][Not invited]
   

  We demonstrate significant photoresponsivity in aqueous media to visible light of pseudo-oligonucleotides possessing 4-(dimethylamino)azobenzene (4-DMAzo) side chains. The spectrum of the 4-DMAzo moiety during 436 nm light irradiation at pH 9 was clearly different from that of the all (E)-form, indicating the presence of the (Z)-form. Thermal (Z)-to-(E) recovery isomerization was faster at pH 9 (kZ-E = 101 s-1) than at pH 11; however, addition of 50% ethanol significantly slowed the thermal recovery isomerization at pH 9 (kZ-E = 2 s-1) and increased the magnitude of the spectral changes. Significant photoregulation of DNA hybridization by visible light was demonstrated under this condition.
• Photochromism of a spiroperimidine compound in polymer matrices

  Yasuo Norikane, Riju Davis, Nobuyuki Tamaoki

  NEW JOURNAL OF CHEMISTRY 33 (6) 1327 - 1331 1144-0546 2009 [Refereed][Not invited]
   

  The photochromic behavior of a spiroperimidine compound, 2,3-dihydro-2-spiro-7'-(8'-imino-7',8'-dihydronaphthalen-1'-amine)-perimidine (PNI), doped in various polymers has been studied. Upon irradiation with 405 nm light, PNI exhibits photochromism, and a color change (light yellow to brown) is observed. The initial (closed) and colored (open) forms exhibit absorption maxima (lambda(max)) around 400 and 500 nm, respectively. The open form possesses a wide absorption band, extending to similar to 750 nm. Little effect of the polymer matrix on the lambda(max) of either the closed or open forms was observed, and these values were also similar to those in solution. The lifetime of the open form depends mainly on the glass transition temperature (T(g)) of the polymer, and ranges from, for example, 11 min to 5.4 d. This indicates that the lifetime of the open form can be readily tuned by simply choosing a suitable polymer matrix. Photochromism in different polymer substrates are demonstrated herein.
• Reversibly tunable helicity induction and inversion in liquid crystal self-assembly by a planar chiroptic trigger molecule

  Manoj Mathews, Nobuyuki Tamaoki

  CHEMICAL COMMUNICATIONS (24) 3609 - 3611 1359-7345 2009 [Refereed][Not invited]
   

  Reversible control of the helical pitch length and inversion of helical handedness in an induced cholesteric liquid crystal phase were accomplished via a combination of photochemical and thermal isomerizations of a planar chiral azobenzenophane molecule.
• Reflection colour changes in cholesteric liquid crystals after the addition and photochemical isomerization of mesogenic azobenzenes tethered to sugar alcohols

  Haruhisa Akiyama, Asuka Tanaka, Hideo Hiramatsu, Jun'ichi Nagasawa, Nobuyuki Tamaoki

  JOURNAL OF MATERIALS CHEMISTRY 19 (33) 5956 - 5963 0959-9428 2009 [Refereed][Not invited]
   

  We controlled reflection colour of the glass-forming cholesteric liquid crystals over the whole visible region using the smectic liquid crystalline photochromic dopants on the basis of the different mechanism from the conventional helical twisting power change, which gave rise to full-colour recording and display materials at a lower additive concentration than that reported previously. We simply tethered multiple mesogenic azobenzene units to sugar alcohols to obtain effective dopants in which the intramolecular mesogenic moieties could adopt smectic-like alignments. The new dopants that featured linear sugar alcohol backbones exhibited increasingly stable smectic phases upon increasing the number of mesogenic groups in the molecule; a corresponding cyclic sugar alcohol derivative exhibited no such smectic phase. Addition of these smectic liquid crystalline dopants to the glass-forming cholesteric liquid crystalline material induced increasingly larger pitch shifts upon increasing the number of intramolecular mesogenic groups in the dopant. Dopants prepared from stereoisomeric sugar alcohol backbones provided similar liquid crystalline phases and induced similar pitch shifts after their addition to the cholesteric liquid crystals. The colour images recorded on the thin layer of the cholesteric liquid crystalline mixture were stabilized by fixing the cholesteric alignment into glassy states, which withstood heating at 70 degrees C.
• Flexible field-effect transistors fabricated on polymer films using liquid crystalline semiconductors with solution process

  Fapei Zhang, Masahiro Funahashi, Nobuyuki Tamaoki

  IDW '08 - Proceedings of the 15th International Display Workshops 2 1495 - 1498 2008/12/01 [Not refereed][Not invited]
   

  Thin-film transistors based on Liquid crystalline oligothiophene derivatives were fabricated. The transistors with the high performance were produced by the simple solution process. When the surface of the gate dielectrics were treated with octatrichlorosilane, the field-effect mobility of the hole reached 0.04 cm 2/Vs with the on/off ratio of 10 7 Furthermore flexible thin-film transistors could be fabricated on polymer thin films. They maintained the performance when the strain reached 3%.
• Hydrogels Based on Surfactant-Free Ionene Polymers with N,N '-(p-Phenylene)dibenzamide Linkages

  Yoshihiro Misawa, Nagatoshi Koumura, Hajime Matsumoto, Nobuyuki Tamaoki, Masaru Yoshida

  MACROMOLECULES 41 (22) 8841 - 8846 0024-9297 2008/11 [Refereed][Not invited]
   

  Ionene Polymers with N,N'-(p-phenylene)dibenzamide linkages were synthesized in high yields by the copolymerization of 1,4-bis[4-(chloromethyl)benzamide] benzene and alpha, omega-ditertiary amines in N,N-dimethylformamide. The ionene polymers provided physical hydrogels under ca. 1-5 wt % of the concentrations after heating and cooling at room temperature without any other additives. The gelation ability was dependent on the diamine spacers and/or the molecular weights, and the ionene polymer with the longest hexylene linker connecting ammonium cations was the most effective gelation capability in water among these ionene polymers. In the theological measurement, the hydrogel showed a unique thixotropic nature that was a fast self-recovering property after the continuous oscillatory shear stress. Furthermore, the ionene polymer has an additional function as a dispersant for single-walled carbon nanotubes (SWNT) in water.
• Photoresponsive glass-forming butadiene-based chiral liquid crystals with circularly polarized photoluminescence

  Ratheesh K. Vijayaraghavan, Shibu Abraham, Haruhisa Akiyama, Seiichi Furumi, Nobuyuki Tamaoki, Suresh Das

  ADVANCED FUNCTIONAL MATERIALS 18 (17) 2510 - 2517 1616-301X 2008/09 [Refereed][Not invited]
   

  The synthesis and study of the photo and thermoresponsive behavior of a series of novel trimesogenes consisting of a diphenylbutadiene core linked to cholesterol moietes on either side via flexible alkyl chains are reported. These molecules possess the combined glass forming properties of bischolesterols and photochromic and luminescent properties of the butadiene moity. The pitch of the cholesteric phase of these materials could be continuosly varied thermally and photochemically, making it possible to tune the color of the film over the entire visible region. The color images thus generated could be stabilized by coverting them to N glasses. These materials were also highly photoluminescent, exhibiting circularly polarized characteriztics in the glassy liquid-crystalline state even by linearly polarized excitation.
• Planar chiral azobenzenophanes as chiroptic switches for photon mode reversible reflection color control in induced chiral nematic liquid crystals

  Manoj Mathews, Nobuyuki Tamaoki

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 130 (34) 11409 - 11416 0002-7863 2008/08 [Refereed][Not invited]
   

  In this report, for the first time, a planar chiral photoresponsive compound has been employed in commercially available nematic liquid crystals to achieve phototunable reflection colors.. We designed an azobenzenophane compound having conformational restriction on the free rotation of naphthalene moiety to impose an element of planar chirality and the corresponding enantiomers were resolved by HPLC on chiral column. We have determined the absolute configuration by comparison of density functional theory (DFT) calculations of its electronic circular dichroism (ECD) spectrum and specific rotation [alpha](D) to experimental ECD and [alpha](D) data. Enantiomers exhibit photochemically reversible isomerization in solution without undergoing thermal or photoinduced racemization. As chiroptic switches in different host nematic liquid crystals, they exhibit good solubility, moderately high helical twisting power, as well as a large change in helical twisting power due to photoisomerization. A unique feature of these chiral photochromic compounds is that no other auxiliary chiral agents is required to achieve a fast photon mode reversible full-range color control in induced cholesterics, that is, both the hypsochromic and bathochromic shift can be obtained from a single LC formulation by reversible photoisomerization of the single chiral compound.
• Ambipolar transport in the smectic E phase of 2-propyl-5 ''-hexynylterthiophene derivative over a wide temperature range

  Masahiro Funahashi, Fapei Zhang, Nobuyuki Tamaoki, Jun-ichi Hanna

  CHEMPHYSCHEM 9 (10) 1465 - 1473 1439-4235 2008/07 [Refereed][Not invited]
   

  5-Hexyl-5 ''-hexynyl-2,2':5',2 ''-terthiophene exhibits the smectic E phase below 200 degrees C and does not crystallize when it is cooled to -100 degrees C Between 200 and -100 degrees C, non-dispersive transport is observed for holes and electrons with time-of-flight spectroscopy. Over the entire temperature range, the electron mobility is approximately twice as high as that of the hole. The hole and electron transport characteristics in the smectic phase below 0 degrees C are explained by the Gaussian disorder model, which was proposed for amorphous organic semiconductors. The disorder parameters, sigma and Sigma, are almost the some for holes and electrons. However, the pre-exponential parameter mu(0) for the electron is twice as large as that for the hole, which can be attributed to the difference in the extension of the LUMO of the molecules. The energetic disorder a is primarily determined by the disorder in the orientation of the permanent dipoles of liquid crystal molecules.
• An H-bonded main-chain liquid-crystalline polymer obtained by in situ photochemical conversion from an H-bonded LC dimer

  Hideyuki Kihara, Nobuyuki Tamaoki

  MACROMOLECULAR CHEMISTRY AND PHYSICS 209 (14) 1424 - 1431 1022-1352 2008/07 [Refereed][Not invited]
   

  An H-bonded main-chain liquid-crystalline (LC) polymer was obtained by in situ photochemical conversion from an H-bonded LC dimer. A bifunctional compound, 1, having a cinnamoyl group at one end and a carboxylic acid group at the other, was synthesized as the H-bonded LC dimer. UV irradiation of 1 in the LC phase in the presence of a sensitizer resulted in its conversion to a photodimer, with a carboxylic acid at both ends, through photocycloaddition of the cinnamoyl moiety. The LC phase was maintained during irradiation, because that of the photodimer was more thermally stable than that of 1. FT-IR analysis revealed that the carboxylic acids of the photodimer dominantly formed hydrogen bonds in the LC phase, which suggests that the photodimers assembled into an H-bonded main-chain LC polymer.
• Unconventional thermodynamically stable cis isomer and trans to cis thermal isomerization in reversibly photoresponsive [0.0](3,3 ')-azobenzenophane

  Yasuo Norikane, Ryuzi Katoh, Nobuyuki Tamaoki

  CHEMICAL COMMUNICATIONS (16) 1898 - 1900 1359-7345 2008/04 [Refereed][Not invited]
   

  Sterically hindered [ 0.0]( 3,3')-azobenzenophane exhibits thermal trans-to-cis isomerization to the thermodynamically stable cis-cis isomer, and reversible photochemical isomerization with good fatigue resistance.
• Molecular packing and solid-state fluorescence of alkoxy-cyano substituted diphenylbutadienes: Structure of the luminescent aggregates

  Riju Davis, N. S. Saleesh Kumar, Shibu Abraham, C. H. Suresh, Nigam P. Rath, Nobuyuki Tamaoki, Suresh Das

  JOURNAL OF PHYSICAL CHEMISTRY C 112 (6) 2137 - 2146 1932-7447 2008/02 [Refereed][Not invited]
   

  A detailed study on the photophysical properties of a series of alkoxy substituted diphenylbutadienes in solution and in the solid state providing a molecular level understanding of the factors controlling their solid-state luminescence behavior is reported. Our studies provide clear evidence for exciton splitting in the solid state resulting in red-shifted emission for this class of materials. The role of the number of alkoxy substituents and the alkyl chain length in controlling the nature of the molecular packing and consequently their fluorescence properties has been elucidated. Whereas in the di- and tri-alkoxy substituted derivatives, the solid-state fluorescence was independent of the length of the alkyl chains, in the monoalkoxy substituted derivatives, increasing the length of the alkyl chain resulted in a visual change in fluorescence from green to blue. On the basis of the analysis of the molecular packing in the single crystals, this difference could be attributed to fluorescence arising from aggregates with an edge-to-face alignment in the molecules possessing short alkyl chains (methyl and butyl) to monomer fluorescence in the long alkyl chain containing derivatives.
• Fluorinated diphenylpolyenes: Crystal structures and emission properties

  Yoriko Sonoda, Midori Goto, Seiji Tsuzuki, Nobuyuki Tamaoki

  JOURNAL OF PHYSICAL CHEMISTRY A 111 (51) 13441 - 13451 1089-5639 2007/12 [Refereed][Not invited]
   

  \(E,E,E)-1,6-Diaryl(Ar)-1,3,5-hexatrienes (2, Ar = 4-fluorophenyl; 3, Ar = 2,4-difluorophenyl; 4, Ar = 2,4,6-trifluorophenyl; 5, Ar = perfluorophenyl) and (E,E,E)-1-perfluorophenyl-6-phenyl-1,3,5-hexatriene (6) were prepared. The absorption and fluorescence spectra in methylcyclohexane solution showed only a small dependence on the fluorine ring substituent, and were similar to those of the unsubstituted parent compound (1, Ar = phenyl). The solid-state absorption and fluorescence spectra shifted to red relative to those in solution and strongly depended on the substituent. The emission from crystals 1-5 originated mainly from monomeric species with the maximum wavelength (lambda(f(max))) of 440-465 nm, which overlapped the emission from molecular aggregates (1-4) or excimeric species (5) in the red region. Crystal 6 exhibited red-shifted (lambda(f(max))) = 530 nm) and structureless emission due to excimers. The cocrystal of 1 and 5 (1/5) showed red-shifted (lambda(f(max))) = 558 nm) and distinctly structured emission, not from exciplexes but from the excited states of molecular aggregates in which molecules 1 and 5 strongly interact already in the ground state. These assignments were confirmed by the results of fluorescence lifetime and quantum yield measurements in the solid state. Singlecrystal X-ray structure analyses showed that the molecules were basically planar in each crystal, whereas the crystal packing was strongly substituent-dependent. Weak pi-pi interactions in the herringbone (1 and 2) and in the pi-stacked but largely offset structures (3 and 4) account for their predominantly monomeric origin of emission. The observation of excimer fluorescence from 5 was rather unexpected, since the molecules in this crystal were arranged in an offset stacking fashion due to perfluorophenyl-perfluorophenyl (C(6)F(5)center dot center dot center dot C(6)F(5)) interaction. The structures of 6 and 1/5 considerably resembled each other, in which molecules were 7-stacked with more face-to-face geometries than those in 5, as a result of strongly attractive perfluorophenyl-phenyl (C(6)F(5)center dot center dot center dot C(6)F(5)) interaction. Nevertheless, the fluorescence origin was clearly different for 6 and 1/5. This can be ascribed to the difference in the strength of orbital-orbital interaction between molecular pi-planes in the ground and excited states in crystals.
• Study of unsymmetrical dimesogens containing 4-heptylazobenzene

  V. Ajay Mallia, Masahiro Funahashi, Nobuyuki Tamaoki

  JOURNAL OF PHYSICAL ORGANIC CHEMISTRY 20 (11) 878 - 883 0894-3230 2007/11 [Refereed][Not invited]
   

  4-Heptylazobenzene (HAB) has been covalently attached to cholesterol (Ch) by varying the methylene spacers and to cyanobiphenyl (CB) moiety with an octyl methylene linkage. Enhancement of short-range translational correlations in the chiral nematic (N*) phase has been observed by the introduction of HAB moiety. HAB-Ch dimesogens exhibit chiral smectic C (SmC*), chiral smectic A (SmA*) and N* phases depending on the methylene spacer length. The dimesogen containing HAB-CB shows a SmA and an N phase. The HAB-Ch dimesogen with octyl methylene spacer shows co-existence of multiple periodicities in its SmA* as well as in SmC* phases. A dramatic increase of > 150 nm in the N* reflected wavelength shift (Delta lambda) with change in temperature has been observed for the HAB-Ch dimesogen containing an octyl spacer compared to the similar dimesogen that does not have a heptyl side chain. Ferroelectric switching has been studied for a representative dimesogen containing HAB-Ch having hexyl spacer in its SmC* phase, the spontaneous polarization value was determined to be 150 nC cm(-2) (at 125 degrees C) by applying a triangular wave field. A reversible photochemical switching between SmA and N phases also has been reported for the dimesogen containing HAB-CB. Copyright (c) 2007 John Wiley & Sons, Ltd.
• Oligomeric electrolyte as a multifunctional gelator

  Masaru Yoshida, Nagatoshi Kouimura, Yoshihiro Misawa, Nobuyuki Tamaoki, Hajime Matsumoto, Hajime Kawanami, Said Kazaoui, Nobutsugui Minami

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 129 (36) 11039 - + 0002-7863 2007/09 [Refereed][Not invited]
   

  We prepared a novel oligomeric electrolyte that acts as a multifunctional gelator. The gelator has the following notable characteristics: (1) facile preparation in one pot involving condensation and subsequent intermolecular quaternization reaction; (2) tunable solubility to apply to various solvents (e.g., organic, aqueous) and ionic liquids by a simple anion-exchange reaction; (3) resistant to acids; (4) fast recovery of the mechanical strength after stress; (5) synergistic use as dispersant for single-wailed carbon nanotubes (SWNT).
• High-performance thin film transistors from semiconducting liquid crystalline phases by solution processes

  Fapei Zhang, Masahiro Funahashi, Nobuyuki Tamaoki

  APPLIED PHYSICS LETTERS 91 (6) 0003-6951 2007/08 [Refereed][Not invited]
   

  The authors have prepared liquid crystalline (LC) semiconducting thin films with smectic phases at room temperature from 5-propyl-5(')-(4-pentylphenyl)-2,2('):5('),2(')-terthiophene (3-TTPPh-5) by spin-coating process. The films consist of large-size (approximately several tens of micrometers) LC domains with a lamellar structure. The ordering of molecular packing within the smectic layer is enhanced after annealing. The performance of thin film transistors (TFTs) based on 3-TTPPh-5 is influenced largely by silane agent modification of the dielectric. The octyltrichlorosilane (OTS) treatment enhances performance and leads to a high hole mobility of more than 4 x 10(-2) cm(2)/V s in ambient air. It is attributed to the formation of highly ordered domains with the size comparable to channel length of the TFT as well as the favorable interaction between OTS and LC molecules. (c) 2007 American Institute of Physics.
• Synthesis and photoinduced phase transitions of poly(N-isopropylacrylamide) derivative functionalized with terminal azobenzene units

  Haruhisa Akiyama, Nobuyuki Tamaoki

  MACROMOLECULES 40 (14) 5129 - 5132 0024-9297 2007/07 [Refereed][Not invited]
   

  We have used an azobenzene derivative substituted with a 2-chloropropionyl group as an initiator for the atom transfer radical polymerization of N-isopropylacrylamide. The resulting polymers, which possessed azobenzene moieties at one of their termini, had molecular weights of 1.7-12.0 kDa. Aqueous solutions of these polymers displayed low critical solution temperatures that alternated reversibly in response to E-to-Z photoisomerization cycles of the terminal azobenzene moieties. The difference between the transition temperatures after exposure to UV and visible irradiation increased linearly up to a value of over 10 degrees C upon decreasing the molecular weight of the polymer.
• Characterization of poly(N-isopropylacrylamide)-grafted interfaces with sum-frequency generation spectroscopy

  Miyamae Takayuki, Akiyama Haruhisa, Yoshida Masaru, Tamaoki Nobuyuki

  Macromolecules 40 (13) 4601 - 4606 0024-9297 2007/06/26 [Refereed][Not invited]
  
• Visible-light photoresponsivity of a 4-(dimethylamino)azobenzene unit incorporated into single-stranded DNA: Demonstration of a large spectral change accompanying isomerization in DMSO and detection of rapid (Z)-to-(E) isomerization in aqueous solution (April, pg 1846, 2007)

  Takashi Kamei, Masabumi Kudo, Haruhisa Akiyama, Momoyo Wada, Jun'ichi Nagasawa, Masahiro Funahashi, Nobuyuki Tamaoki, Taro Q. P. Uyeda

  EUROPEAN JOURNAL OF ORGANIC CHEMISTRY (18) 3053 - 3053 1434-193X 2007/06 [Refereed][Not invited]
  
• Assembly and photoinduced organization of mono- and oligopeptide molecules containing an azobenzene moiety

  Yoko Matsuzawa, Katsuyuki Ueki, Masaru Yoshida, Nobuyuki Tamaoki, Tohru Nakamura, Hideki Sakai, Masahiko Abe

  ADVANCED FUNCTIONAL MATERIALS 17 (9) 1507 - 1514 1616-301X 2007/06 [Refereed][Not invited]
   

  Assembled systems consisting of an azobenzene moiety as the photofunctional component and valyl units as the network backbone are investigated. The molecular ordering of these assemblies is examined by spectroscopy and theoretical calculations. The number of valyl units greatly influences the molecular order in the organized systems. Only N-(L-valyl-L-valyl-L-valyl)azobenzene-4-carboxamide (3) forms a complete beta-sheet structure in this artificial assembly. Upon photoirradiation, the azobenzene moieties isomerize completely, revealing the reversibility in the structural organization through the flexibility of the beta-sheet network in this system.
• Visible-light photoresponsivity of a 4-(dimethylamino)azobenzene unit incorporated into single-stranded DNA: Demonstration of a large spectral change accompanying isomerization in DMSO and detection of rapid (Z)-to-(E) isomerization in aqueous solution

  Takashi Kamei, Masabumi Kudo, Haruhisa Akiyama, Momoyo Wada, Jun'ichi Nagasawa, Masahiro Funahashi, Nobuyuki Tamaoki, Taro Q. P. Uyeda

  EUROPEAN JOURNAL OF ORGANIC CHEMISTRY (11) 1846 - 1853 1434-193X 2007/04 [Refereed][Not invited]
   

  We demonstrate significant visible-light photoresponsivity in a synthesized oligonucleotide containing a built-in pseudonucleotide possessing a 4-(dimethylamino)azobenzene (4-DMAzo) side chain. In dry DMSC) as solvent, two clearly distinguishable spectra corresponding to the (E) and (Z) forms of the 4-DMAzo moiety tethered to the oligonucleotide were recorded with a conventional spectrophotometer before and after irradiation with 420 nm wavelength light, which induced (E)-to-(Z) isomerization. In addition, (Z)-to-(E) isomerization was accelerated by irradiation with either visible (lambda = 550 nm) or UV (lambda = 350 nm) light, demonstrating reversible photoresponsivity of the pseudo-oligonucleotide. In aqueous solutions the (Z)-to-(E) thermal isomerization of the photoresponsive pseudo-oligonucleotide was very rapid and was only detectable by laser flash photolysis. (c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007).
• Four (E,Z,E)-1-(4-alkoxyphenyl)-6-(4-nitrophenyl)hexa-1,3,5-trienes

  Yoriko Sonoda, Seiji Tsuzuki, Nobuyuki Tamaoki, Midori Goto

  ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS 63 O196 - O200 0108-2701 2007/03 [Refereed][Not invited]
   

  The crystal structures of the four E, Z, E isomers of 1-(4-alkoxyphenyl)-6-(4-nitrophenyl)hexa-1,3,5-triene, namely (E,Z,E)-1-(4-methoxyphenyl)-6-(4-nitrophenyl) hexa-1,3,5-triene, C19H17NO3, (E,Z,E)-1-(4-ethoxyphenyl)-6-(4-nitrophenyl)hexa-1,3,5-triene, C20H19NO3, (E,Z,E)-1-(4-nitrophenyl)6-(4-n-propoxyphenyl)hexa-1,3,5-triene, C21H21NO3, and (E,Z,E)-1-(4-n-butoxyphenyl)-6-(4-nitrophenyl)hexa-1,3,5-triene, C22H23NO3, have been determined. Intermolecular N center dot center dot center dot O dipole interactions between the nitro groups are observed for the methoxy derivative, while for the ethoxy derivative, two adjacent molecules are linked at both ends through N center dot center dot center dot O dipole-dipole interactions between the N atom of the nitro group and the O atom of the ethoxy group to form a supramolecular ring-like structure. In the crystal structures of the n-propoxy and n-butoxy derivatives, the shortest intermolecular distances are those between the two O atoms of the alkoxy groups. Thus, the nearest two molecules form an S-shaped supramolecular dimer in these crystal structures.
• High ambipolar mobility in a highly ordered smectic phase of a dialkylphenylterthiophene derivative that can be applied to solution-processed organic field-effect transistors

  Masahiro Funahashi, Fapei Zhang, Nobuyuki Tamaoki

  ADVANCED MATERIALS 19 (3) 353 - + 0935-9648 2007/02 [Refereed][Not invited]
   

  A phenylterthiophene derivative that exhibits a highly ordered smectic phase around room temperature is synthesized. In the bulk of the smectic phase, ambipolar carrier transport is observed and electron mobility exceeds 0.2 cm(2) V-1 S-1. Thin-film transistors (see the AFM image in the figure) are fabricated by a spin-coating method and exhibit p-type operation, a field-effect mobility of 0.02 cm(2) v(-1) s(-1), and an on/off ratio of 10(6).
• Effect of pretransitional organization in chiral nematic of oligothiophene derivatives on their carrier transport characteristics

  Masahiro Funahashi, Nobuyuki Tamaoki

  CHEMISTRY OF MATERIALS 19 (3) 608 - 617 0897-4756 2007/02 [Refereed][Not invited]
   

  We have synthesized three phenylquaterthiophene derivatives (liquid-crystalline semiconductors that exhibit a chiral nematic phase) and investigated their carrier transport characteristics in the chiral nematic phases with the time-of-flight technique. In contrast to the ionic nature of negative carrier transport, positive carrier transport in the chiral nematic phases of these compounds should be attributed to electronic charge carrier transport. The temperature dependence of the positive carriers in the chiral nematic phases of these compounds were strongly affected by a pretransitional smectic order formation.
• Modulation of unconventional fluorescence of novel photochromic perimidine spirodimers

  Rijn Davis, Nobuyuki Tamaoki

  CHEMISTRY-A EUROPEAN JOURNAL 13 (2) 626 - 631 0947-6539 2007 [Refereed][Not invited]
   

  Fluorescence modulation by a class of photochromic perimidine spirodimers, which exhibit a characteristic fluorescence associated with their photochromic reactions, has been described. Upon irradiation using 365 nm light, these non-fluorescent spiro molecules undergo a thermally-reversible ring opening at their spiro junction resulting in the generation of strong fluorescence. The fluorescing species is distinctly different from both the stable ring-closed and the ring-opened compounds, though it appears to have been formed from and remains in equilibrium with the photochemically generated ring-opened form. While the fluorescing species possesses a narrow absorption band with its maximum centered at 500 nm, the ring-opened form exhibits a broad absorption across the visible region with two maxima centered at 410 and 650 nm, respectively. After initiating the photochromic reactions in these molecules using 365 nm light, purely photochemically-controlled fluorescence modulation can be carried out using two wavelengths in the visible region, that is, 500 and 700 nm, while the equilibrium concentration of the ring-opened form and the fluorescing species is controlled. Fluorescence modulation is attained also by controlling the ratio of the ring-closed and ring-opened forms by photochemical ring-opening and thermal ring-closing reactions. The study on the effect of substitution of these molecules suggests that by extending the conjugation of the perimidine core in the ring-opened form the molecule is rendered nonfluorescent and hence it can be assumed that the perimidine core forms the fluorescing entity of the molecule.
• In situ photochemical conversion from cinnamoyl-functionalized liquid-crystalline monomers to liquid-crystalline dimers

  Hideyuki Kihara, Nobuyuki Tamaoki

  LIQUID CRYSTALS 34 (11) 1337 - 1347 0267-8292 2007 [Refereed][Not invited]
   

  Liquid-crystalline ( LC) monomers, which were functionalized with a cinnamoyl group on their extremity, were synthesized and irradiated with UV light in their LC phases. In the presence of a triplet sensitizer, most LC monomers were converted into the corresponding dimers, which were produced by the cycloaddition reaction of the cinnamoyl group. The photodimerization reaction could proceed while the LC phases were maintained, because the dimers showed LC phases whose temperature ranges were wider than those of the corresponding monomers. A H-1 NMR study of the LC dimers indicated that the cyclobutane unit dominantly had an anti-head-to-head configuration, that is, delta-truxinate. As the LC monomers, which had a phenyl biphenyl-4-carboxylate moiety as a mesogen, showed smectic A phases and the corresponding dimers also exhibited smectic A phases, we estimated the smectic layer distances by X-ray diffraction analysis and found that the dimers adopted the structure in which the two mesogens aligned laterally and existed in the same smectic layer in the LC phases.
• Field-effect transistors based on liquid crystalline oligothiophene semiconductors with solution process

  M. Funahashi, F. Zhang, N. Tamaoki

  IDW '07: PROCEEDINGS OF THE 14TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3 459 - + 2007 [Refereed][Not invited]
   

  2-Alkyl-5 ''-(p-alkylphenyl)terthiophene derivatives were synthesized and around room temperature, they exhibited highly ordered smectic phases in which fast electronic carrier transport is possible. This compound was applied to thin film transistors fabricated with solution process. Thin films have molecular packing structure and their surface morphology is remarkably developed by thermal annealing at low temperature and in short time. The carrier mobility of the FET was 0.042 cm(2)/Vs with the on/off ratio exceeding 10(6).
• Photochemical synthesis of a main-chain LC oligomer from an alpha,omega-dicinnamoyl-functionalized LC monomer: Photoirradiation in the crystalline state

  Hideyuki Kihara, Nobuyuki Tamaoki

  MOLECULAR CRYSTALS AND LIQUID CRYSTALS 470 31 - 37 1542-1406 2007 [Refereed][Not invited]
   

  An LC compound 1,4-bis[4-(6-cinnamoyloxyhexyloxy)benzoyloxy]benzene, 1, was Synthesized, having cinnamoyl groups at the each end of the molecule, and was found to show polymorphism in the crystalline state. A rapid cooling from the isotropic melt of 1 to room temperature gave a K1 crystal, while annealing the mesophase of 1 at 95 degrees C afforded a K2 crystal. LW irradiation (>300nm) of both the K1 and K2 crystals at room temperature resulted in the formation of linear LC oligomers with cyclobutane rings in the main chain. H-1 NMR spectroscopy revealed that the cyclobutane units of the oligomer obtained from K1 assumed anti and syn head-to-head configurations, whereas those from K2 predominantly formed an anti head-to-tail structure.
• Organic semiconductors with helical structure based on oligothiophene derivatives exhibiting chiral nematic phase

  Masahiro Funahashi, Nobuyuki Tamaoki

  MOLECULAR CRYSTALS AND LIQUID CRYSTALS 475 123 - + 1542-1406 2007 [Refereed][Not invited]
   

  We have synthesized 2-[5-(4-[(S)-2-methylbutoxy]phenyl)-3-methyl]-2'''-propyl-2: 5'-2'-5 ''-2 ''-5"'-quaterthiophene (10), a liquid crystalline semiconductor that exhibits a chiral nematic phase, and used the time-of-flight technique to determine its carrier mobility behavior. In the chiral nematic phase, the positive carrier mobility was 2 x 10(-4)cm(2)/Vs at 120 degrees C and the negative carrier mobility was 1 x 10-4 cm(2)/Vs, both of which we attribute to electronic processes. For the negative carrier, in addition to the fast electronic process, we also observed a slow carrier transport, having mobility on the order of 10(-5)cm(2)/Vs, which we attribute to ionic conduction. Chiral dimers containing binaphthyl group exhibited stable glassy cholesteric phase and cholesteric thin films with selective reflection band in visible light area could be fabricated. They emitted circularly polarized light with dichroic parameter of 1.3 when UV light was illuminated.
• Fluorescence spectroscopic properties and crystal structure of a series of donor - Acceptor diphenylpolyenes

  Yoriko Sonoda, Midori Goto, Seiji Tsuzuki, Nobuyuki Tamaoki

  JOURNAL OF PHYSICAL CHEMISTRY A 110 (50) 13379 - 13387 1089-5639 2006/12 [Refereed][Not invited]
   

  A series of p-nitro-p'-alkoxy(OR)-substituted (E,E,E)-1,6-diphenyl-1,3,5-hexatrienes (1a,R)Me;1b,R= Et;1c, R = n-Pr; 1d, R = n- Bu) were prepared. The absorption and fluorescence spectra in solution were almost independent of the alkoxy chain length. The absorption maximum showed only a small dependence on the solvent polarity, whereas the fluorescence maximum red-shifted largely as the polarity increased. The solid-state absorption and fluorescence spectra were red-shifted relative to those in low polar solvents and were clearly dependent on the alkoxy chain length. The fluorescence maxima for the crystals of 1b and 1d were observed at 635-650 nm, which were red-shifted by 40-50 nm relative to those for 1a and 1c. The Stokes shifts were all relatively small (3000-3500 cm(-1)). For all four compounds, the fluorescence decay curves in the solid state were able to be analyzed by single-exponential fitting to give the lifetimes of 1.1-1.3 ns. This indicates that the emission of 1a-d is not originated from an excimer or molecular aggregates, but from only one emitting monomeric species. The fluorescence quantum yields of 1a-d were considerably high compared with the values for organic solids, which is consistent with their monomeric origin of emission. Single-crystal X-ray structure analyses of 1a, 1c, and 1d showed that the crystal packing was dependent on the alkoxy chain length. The crystals of 1a and 1c had herringbone structure, whereas that of 1d had pi-stacked structure. Strong pi-pi interaction in the crystal of 1d would be the cause of the spectral red shifts relative to those for 1a and 1c. No observation of excimer fluorescence from crystal 1d can be attributed to the limited overlap between the pi-planes of the molecules due to its "slipped-parallel" structure.
• Palladium-catalyzed C-H homocoupling of bromothiophene derivatives and synthetic application to well-defined oligothiophenes

  Masabumi Takahashi, Kentaro Masui, Hiroki Sekiguchi, Nobuhiko Kobayashi, Atsunori Mori, Masahiro Funahashi, Nobuyuki Tamaoki

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128 (33) 10930 - 10933 0002-7863 2006/08 [Refereed][Not invited]
   

  Synthesis of oligothiophenes of well-defined structures that possess 2-8 thiophene units is performed with a new synthetic strategy involving C-H homocoupling of bromothiophenes and cross-coupling with organostannanes. Tolerance of the carbon-bromine bond to the palladium-catalyzed C-H homocoupling results in oligothiophenes bearing C-Br bonds at the terminal thiophene rings, which allow further transformation by the catalysis of a transition-metal complex.
• Reversible thermal and photochemical switching of liquid crystalline phases and luminescence in diphenylbutadiene-based mesogenic dimers

  Shibu Abraham, V. Ajay Mallia, K. Vijayaraghavan Ratheesh, Nobuyuki Tamaoki, Suresh Das

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128 (23) 7692 - 7698 0002-7863 2006/06 [Refereed][Not invited]
   

  The synthesis and study of the photo- and thermoresponsive behavior of a series of novel asymmetric mesogenic dimers, consisting of a cholesterol moiety linked to a diphenylbutadiene chromophore via flexible alkyl chains are reported. These mesogenic dimers possess the combined glass forming properties of the cholesterol moiety and the photochromic and luminescent properties of the butadiene moiety. Photoinduced cis/trans isomerization of the butadiene chromophore in these materials could be utilized to bring about an isothermal phase transition from the smectic to the cholesteric state. By photochemically controlling the cis/trans isomer ratio, the pitch of the cholesteric could be continuously varied making it possible to tune the color of the film over the entire visible region, and the color images thus generated could be stabilized by converting them to N* glasses. These materials were also polymorphic, exhibiting two crystalline forms possessing distinctly different fluorescence properties. The ability to thermally switch these materials from one crystalline form to the other in a reversible manner also makes them useful for recording fluorescent images.
• Electronic conduction in the chiral nematic phase of an oligothiophene derivative

  M Funahashi, N Tamaoki

  CHEMPHYSCHEM 7 (6) 1193 - 1197 1439-4235 2006/06 [Refereed][Not invited]
  
• A main-chain liquid-crystalline oligomer prepared by in situ photopolymerization of an LC monomer having cinnamate moieties

  H Kihara, N Tamaoki

  MACROMOLECULAR RAPID COMMUNICATIONS 27 (11) 829 - 834 1022-1336 2006/06 [Refereed][Not invited]
   

  A liquid-crystalline (LC) compound, having a cinnamate moiety on each end of the molecule, was synthesized and irradiated with UV light in its LC phase in the presence of a triplet sensitizer. Various measurements of the irradiated sample revealed that the linearly structured LC oligomer were formed by [2+2] cycloaddition of the cinnamate moieties, and that the resultant cyclobutane units dominantly assumed an anti head-to-head configuration.
• Dynamic control of racemization rate through E-Z photoisomerization of azobenzene and subsequent partial photoresolution under circular polarized light

  Nobuyuki Tamaoki, Momoyo Wada

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128 (19) 6284 - 6285 0002-7863 2006/05 [Refereed][Not invited]
  
• Synthesis, liquid-crystalline properties, and photo-optical studies of photoresponsive oligomeric mesogens as dopants in a chiral glassy liquid crystal

  H Akiyama, VA Mallia, N Tamaoki

  ADVANCED FUNCTIONAL MATERIALS 16 (4) 477 - 484 1616-301X 2006/03 [Refereed][Not invited]
   

  We have prepared photoresponsive oligomers that have Molecular weights of ca. 4500, 8000, and 1.6 000 g mol(-1) via the free-radical polymerization of 4-[4-alkylplienylazo]phenoxyalkyl acrylates. All of the oligomers possess bilayer smectic A (SmA) and smectic B (SmB) phases. Increasing, the concentration of these oligomeric dopants in a glass-forming cholesteric liquid crystal causes a dramatic red-shift in the reflection wavelength. The pitch shifts are very dependent on the alkyl chain lengths and molecular weights of the dopants. The oligomer that contains octyl chains and an octyl spacer, and that has a molecular weight of 4500 g mol(-1) exhibits the largest shift in the reflection wavelength. UV exposure has been used to control the cholesteric reflection pitch of the oligomer-cholesteric glassy liquid-crystal mixture over the entire visible region of the electromagnetic spectrum and vitrifies the samples by rapid cooling from their cholesteric temperatures to 0 degrees C. Extremely stable, even at 70 degrees C, erasable, full-color images have been created using this host-guest mixture.
• Photochemical and thermal cis/trans isomerization of cyclic and noncyclic azobenzene dimers: Effect of a cyclic structure on isomerization

  Y Norikane, N Tamaoki

  EUROPEAN JOURNAL OF ORGANIC CHEMISTRY (5) 1296 - 1302 1434-193X 2006/02 [Refereed][Not invited]
   

  The effect of ring strain on the photochemical and thermal isomerization of azobenzene dimers was investigated by comparison of macrocyclic (1) and noncyclic (2) azobenzene dimers. The macrocycle 1 comprises two azobenzene moieties connected at their meta positions through two methylene linkers, whereas the noncyclic dimer 2 has only one methylene linker bridging two azobenzenes at the meta positions. Upon irradiation of 1 or 2 with UV light, each (E/E) (transl/ trans) isomer exhibited a stepwise photoisomerization to give the corresponding (E/Z) (trans/cis) isomer, followed by isomerization to yield the (Z/Z) (cis/cis) isomer. Quantum yields for the isomerization indicated that the photochemical isomerizations of 1 were altered by its cyclic structure. The effect on the photochemical isomerization process can be explained in terms of the ring strain, causing shifts in the absorption spectra of the azobenzene chromophore and perturbations in molecular motion in the excited state. Thermal (Z) -> (E) isomerization was observed in each I and 2, taking place in stepwise manner as (Z/Z) -> (E/Z) -> (E/E). The cyclic structure gave higher activation barriers (E(a) and Delta H(double dagger)) and activation entropies (Delta S(double dagger)). HF/6-31G** calculations were carried out for 1 and 2 in their ground electronic states in order to estimate the ring strain of each isomer of 1. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006).
• Carrier transport properties in liquid crystalline oligothiopehene semiconductors and their device applications

  M. Funahashi, F. Zhang, N. Tamaoki

  IDW '06: PROCEEDINGS OF THE 13TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3 19 - 22 2006 [Refereed][Not invited]
   

  asymmetrically substituted oligothiophene derivatives were synthesized and around room temperature, they exhibited highly ordered smectic phases in which fast electronic carrier transport. In particular high electron mobility exceeding over 0.2 cm(2)/Vs was observed in propyl(4-pentylphenyl)terthiophene. This compound was applied to thin film transistors fabricated with solution process. In addition to smectic phases, electronic charge carrier transport was also observed in the cholesteric phase of phenylquarterthiophene derivatives with extended p-conjugated system which emitted circularly polarized light by UV light excitation.
• Study of chiral dimesogens: Liquid crystalline properties, effect of smectic cybotactic domains in controlling the chiral reflections and glassy liquid crystal forming properties

  VA Mallia, N Tamaoki

  MOLECULAR CRYSTALS AND LIQUID CRYSTALS 454 81 - 90 1542-1406 2006 [Refereed][Not invited]
   

  Liquid crystalline properties, temperature dependent reflection studies and glassy liquid crystal forming properties of azobenzene/alkylazobenzene containing cholesterol dimesogens with varying methylene spacers have been described. All these compounds exhibit chiral nematic phases, and both chiral nematic and smecticA phases have been observed for the dimesogens containing 4-alkylazobenzene moieties. X-ray diffraction studies in the smecticA phases of these dimesogens show that both monolayer and intercalated arrangements co-exist in the meso phase. Selective reflection observed in the chiral nematics was found to be red shifted upon lowering the temperature due to fluctuations in smectic order. By rapid cooling of the 4-alkylazobenzene compounds from the cholesteric phase transition temperature to 0 degrees C, solid films maintaining a helical molecular order were obtained.
• Thermal and photo optical properties of azoxybenzene/alkyloxy-ambenzene-cholesterol dimesogens with alkyl diacetylene linker

  S Kumaresan, VA Mallia, Y Kida, N Tamaoki

  JOURNAL OF MATERIALS RESEARCH 20 (12) 3431 - 3438 0884-2914 2005/12 [Refereed][Not invited]
   

  Thermal and photo-optical properties of azoxybenzene/alkyloxy-azobenzene containing chiral dimesogens are presented. Alkyloxyazobenzene containing dimesogenic materials exhibited two kinds of smectic A phases. Photoirradiation at temperatures exhibiting, smectic phases of pure materials in azobenzene linked dimesogens resulted in formation of the isotropic phase, and this was systematically studied at different liquid crystalline temperatures. The efficacy of these compounds as a dopant in the glassy liquid crystalline material was also explored. Increasing concentration to 4 wt%/5 wt% in azobenzene/azoxy-benzene derivatives caused a dramatic red-shift in the wavelength of reflected light by the host cholesteric glassy liquid crystal. Photo-isomerization of these dopants led to a blue-shift of the reflected light, and this effect could be used to tune the light reflectivity of these mixtures over the visible region.
• Photoinduced hinge-like molecular motion: Studies on xanthene-based cyclic azobenzene dimers

  SA Nagamani, Y Norikane, N Tamaoki

  JOURNAL OF ORGANIC CHEMISTRY 70 (23) 9304 - 9313 0022-3263 2005/11 [Refereed][Not invited]
   

  Molecular devices incorporating azobenzene units represent active components of smart systems, as they are capable of exhibiting photoregulated cooperative molecular motion. Herein, we describe the synthesis, X-ray crystal analysis, and photochemical and thermal studies of a xanthene based cyclic azobenzene dimer and its precursor. The trans-trans isomer of the azobenzene dimer upon photoirradiation transforms to the cis-cis isomer through an intermediate trans-cis isomer. The X-ray crystal structures of the trans-trans isomer (open) and the cis-cis isomer (closed) provide unambiguous proof for the hinge-like molecular motion in this class of molecules. The inferences drawn from photochemical and thermal studies shed light on the effect of varied substitution and cyclic structures on the different transitions. The lifetime of the cis-cis isomer is estimated to be 6.43 years, whereas the trans-cis isomer is short-lived (2.73 min) at 303 K. A rational explanation for the relative stability of the different isomers is derived from the isokinetic plot and theoretical calculations.
• Novel photochromic spiroheterocyclic molecules via oxidation of 1,8-diaminonaphthalene

  R Davis, N Tamaoki

  ORGANIC LETTERS 7 (8) 1461 - 1464 1523-7060 2005/04 [Refereed][Not invited]
   

  [GRAPHICS] Novel spiroheterocyclic molecules, namely, 2,3-dihydro-2-spiro-7'-[8'-imino-7',8'-dihydronaphthalen-1'-amine]perimidine, PNI, and 2,3-dihydro2-spiro-4'-[8'-aminonaphthalen-1'(4H)-one]perimidine, PNO-p, were obtained by oxidation of 1,8-diaminonaphthalene using manganese dioxide. These molecules exhibit thermally reversible photochromism with good photofatigue resistance, and their photogenerated forms possess broad absorption in the visible region.
• Synthesis, isomerization and functions of cyclophanes containing azobenzene units in the main frame

  N Tamaoki

  JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN 63 (4) 370 - 376 0037-9980 2005/04 [Refereed][Not invited]
   

  The photochromic reaction of azobenzenes has been applied to many soft materials whose functions can be controlled by the action of light. In order to accomplish a selective photochromic reaction, a new strategy utilizing a macrocyclic structure in which photochromic units are inserted into the main frame of the ring is proposed. The isomerization rate of azobenzene units from a cis form to a trans form is affected by the ring strain, the extent of which depends on the length of the spacers and the positions connecting azobenzene chromophores. This effect was applied to realize the bistability and light-intensity dependence in the photochromic systems. The concept shown here can be used for the photoresponsive molecular machines or the molecular memory.
• Two dimensionally ion-conductive liquid crystals of cholesterol/tetra(ethylene oxide) block molecules

  K Kishimoto, Y Sagara, T Kato, T Mukai, H Ohno, N Tamaoki

  MOLECULAR CRYSTALS AND LIQUID CRYSTALS 435 777 - 785 1542-1406 2005 [Refereed][Not invited]
   

  Two-dimensionally ion-conductive liquid crystals have been simply obtained by self-assembly of a cholesterol/tetra(ethylene oxide) block molecule and lithium triflate. Nanophase-segregation between cholesterol and tetra(ethylene oxide) blocks leads to the formation of a smectic A liquid crystalline phase in a wide range of temperature. A homeotropically aligned lithium salt complex in the smectic A phase shows two-dimensional ionic conductivity. The ionic conductivities parallel to the smectic layers are higher than those perpendicular to the layers. The maximum value of the anisotropy in the ionic conductivity is about 2.4 x 10(3) at 30 degrees C.
• Photocontrolled gel-to-sol-to-gel phase transitioning of meta-substituted azobenzene bisurethanes through the breaking and reforming of hydrogen bonds

  N Koumura, M Kudo, N Tamaoki

  LANGMUIR 20 (23) 9897 - 9900 0743-7463 2004/11 [Refereed][Not invited]
   

  An azobenzene derivative substituted at its meta positions with two urethane moieties linked to two cholesteryl ester units forms a gel that exhibits sol-gel phase transitions upon photoirradiation as a result of trans-cis isomerization of the azobenzene unit. During the sol-gel phase transitions, hydrogen bonds, which are partly responsible for stabilizing the gels, are broken or reformed. Using circular dichroism spectroscopy, we detected asymmetrical fibrous networks in the aggregates of these gelators.
• Polymers derived from N-isopropylacrylamide and azobenzene-containing acrylamides: Photoresponsive affinity to water

  H Akiyama, N Tamaoki

  JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 42 (20) 5200 - 5214 0887-624X 2004/10 [Refereed][Not invited]
   

  N-Isopropylacryamide was copolymerized by free-radical polymerization with N-[2-(4-phenylazophenoxy)ethyllacrylamide derivatives that were substituted at their 4'-position with ethoxy, methoxyethoxy, or isopropyl units, or with N-{2-[4(pyridin-2-ylazo)phenoxyl ethyl) acrylamide. The polymers were soluble in cold water and possessed lower critical solution temperatures (LCSTs). The value of the LCST rose a few degrees after UV irradiation and dropped after irradiation with visible light, reversibly, in processes that corresponded to the isomerization of the azobenzene units. The polymers became increasingly hydrophobic after increasing their azobenzene content. The difference of hydrophobicity correlates with the absorption band height at about 400 nm. The structure of the substituent on the azobenzene unit affected both the transition temperature and the hydrophobicity. A change in photoinduced wettability for water was observed to occur on a prepared film at a temperature different from the LCST determined in water. (C) 2004 Wiley Periodicals, Inc.
• Novel odd/even effect of alkylene chain length on the photopolymerizability of organogelators

  K Aoki, M Kudo, N Tamaoki

  ORGANIC LETTERS 6 (22) 4009 - 4012 1523-7060 2004/10 [Refereed][Not invited]
   

  Starting from diactylene diacarboxylic acids, we have synthesized a series of photopolymerizable organogelators that possess simple amide structures, different alkylene chain lengths, and either optically active or racemic 3,7-dimethyl-1-octylamine units. The alkylene chain length of these compounds exhibits a prominent odd/even effect with respect to the photopolymerization in the gel state and is accompanied by a stereostructural effect on the gelation ability.
• Organogelation of diacetylene cholesteryl esters having two urethane linkages and their photopolymerization in the gel state

  J Nagasawa, M Kudo, S Hayashi, N Tamaoki

  LANGMUIR 20 (19) 7907 - 7916 0743-7463 2004/09 [Refereed][Not invited]
   

  Various diacetylene cholesteryl esters having two urethane linkages were synthesized to study the relationship between their gelation properties and chemical structures. Most of these compounds form organogels in cyclohexane, and some compounds gelatinized hexane, diethyl ether, N,N-dimethylformamide, and ethanol. The cholesteryl moieties play an important role in gel formation, but IR spectroscopic measurements show that the main driving force for gelation is hydrogen bonding of the urethane groups. Upon UV irradiation, most of the gels polymerized to give polydiacetylenes, with concomitant changes from colorless to a variety of hues, such as dark blue, orange, and pink. The polymerization proceeds efficiently in cases where the gels change color to dark blue. The polymerization reached 52% chemical yield, with the quantum yield estimated to be at least 54. Solid-state NMR spectroscopy confirmed that polymerization in the gel state proceeds via 1,4-addition.
• Butadienes as novel photochromes for color tuning of cholesteric glasses: Influence of microscopic molecular reorganization within the helical superstructure

  R Davis, VA Mallia, S Das, N Tamaoki

  ADVANCED FUNCTIONAL MATERIALS 14 (8) 743 - 748 1616-301X 2004/08 [Refereed][Not invited]
   

  1-(Alkoxyphenyl)-4-(cyanophenyl)buta-1E,3E-dienes have been used as novel photoresponsive dopants for investigating light-induced changes in the pitch of a glass-forming cholesteric liquid crystal (CLC), dicholesteryl-10,12-docosadiynedioate. X-ray diffraction studies have helped to establish the role of microscopic changes of smectic domains within the helical superstructure, induced by the dopant molecules and their photoisomers, which result in changes in their macroscopic light-reflecting properties. Increasing concentration (1-12 wt.-%) of these dopants causes a dramatic red-shift in the wavelength of reflected light by the host CLC, extending it into the near-infrared region. The extent of red-shift depends strongly on the molecular length of the dopants and those possessing lengths between 25-28 Angstrom, namely 1-(octyloxyphenyl)-4-(cyanophenyl)buta-1E,3E-diene and 1-(decyloxyphenyl)-4-(cyanophenyl)buta-1E,3E-diene, exhibit the maximum shift (Deltalambda(max)=435 nm). Photoisomerization of these dopants leads to a blue-shift of the reflected light and this effect could be used to tune the light reflectivity of these mixtures over a large part of the visible region. The cholesteric pitch and hence the reflected light by these materials could be fixed in a glassy state by rapidly cooling them from their cholesteric temperatures to 0 degreesC. The efficacy of these materials for full-color photoimaging has also been demonstrated.
• Light-driven molecular hinge: A new molecular machine showing a light-intensity-dependent photoresponse that utilizes the trans-cis isomerization of azobenzene

  Y Norikane, N Tamaoki

  ORGANIC LETTERS 6 (15) 2595 - 2598 1523-7060 2004/07 [Refereed][Not invited]
   

  A new class of molecular machine exhibits a hingelike motion upon photo irradiation. The motion (close and open) can be operated by alternate irradiation with UV and visible light. The trans/trans and cis/cis isomers are thermally stable at 40degreesC, and the photochemical closure reaction (from trans/trans to cis/cis isomer) is dependent on the intensity of the light used because of the short-lived intermediate (trans/cis isomer).
• Thermal hysteresis in the photoresponsivity of a Langmuir film of amphiphilic spiropyran

  M Matsumoto, T Nakazawa, VA Mallia, N Tamaoki, R Azumi, H Sakai, M Abe

  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 126 (4) 1006 - 1007 0002-7863 2004/02 [Refereed][Not invited]
  
• Design of chiral dimesogens containing cholesteryl groups; formation of new molecular organizations and their application to molecular photonics

  VA Mallia, N Tamaoki

  CHEMICAL SOCIETY REVIEWS 33 (2) 76 - 84 0306-0012 2004/02 [Refereed][Not invited]
   

  Photoresponsive liquid crystals and organogels are finding increasing application in information technology and photonics. In this tutorial review, the authors describe how weak intermolecular interactions facilitate molecular organization of cholesterol-containing dimesogens to form such materials. Design considerations and photoresponsive properties of both organogels and glassy liquid crystals are discussed and their applications to molecular photonics highlighted. The review will be of value to readers interested in the development of new materials which respond to the different properties of light.
• Photoactive dimesogen having different pathways of light driven phase transitions at different temperatures

  VA Mallia, N Tamaoki

  CHEMICAL COMMUNICATIONS (22) 2538 - 2539 1359-7345 2004 [Refereed][Not invited]
   

  We hereby describe a novel example of light driven phase transitions in a photoresponsive dimesogen, which goes through different pathways at different temperatures. The isomer ratios required to obtain the phase transition in each case have also been determined.
• Molecular mechanism of anomalous increase in the helical pitch of cholesteric liquid crystals induced by achiral dopants

  M Kidowaki, M Moriyama, M Wada, N Tamaoki

  JOURNAL OF PHYSICAL CHEMISTRY B 107 (44) 12054 - 12061 1520-6106 2003/11 [Refereed][Not invited]
   

  A dopant-induced anomalous increase in the helical pitch of dicholesteryl 10,12-docosadiynedioate 1 is explained by generation of smectic clusters in the cholesteric phase where the dopants act as promoters of smectic domains. The dopants, having a mesogenic core and the proper length of alkyl chains on both their molecular sides, such as 4,4'-dialkylazobenzenes, 4,4'-dialkylazoxybenzenes and 4,4'-dialkylbiphenyls, considerably increase the pitch. However, dopants having benzene or a binaphthyl structure in the molecular center, an alkyl chain at one side of the molecules and Z-isomers of azobenzene and azoxybenzene derivatives, slightly decrease the pitch by acting as impurities that decrease the transition temperature of the host. An X-ray diffraction study of the cholesterics revealed that the pitch increases with an increase in size and amount of the smectic domains induced by the appropriate dopants.
• Quantum chemical studies on photoinduced Cis-Trans isomerization and intramolecular hydrogen atom transfer of 2′-hydroxychalcone

  Yasuo Norikane, Naofumi Nakayama, Nobuyuki Tamaoki, Tatsuo Arai, Umpei Nagashima

  Journal of Physical Chemistry A 107 (41) 8659 - 8664 1089-5639 2003/10/16 [Refereed][Not invited]
   

  The reaction mechanism of the one-way isomerization of 2′-hydroxychalcone (2HC) was studied by calculating the potential energy surfaces of the twist of the C=C double bond and the intramolecular hydrogen atom transfer in the excited triplet state by the UB3LYP/6-31G** level. The calculations reveal the following. The potential energy curve of the triplet state between the keto forms (trans-2HC and cis-2HC) is similar to that of stilbene, which exhibits mutual isomerization. On the other hand, the potential energy curve between the enol forms (trans-2HC′ and cis-2HC′) is similar to that of styrylanthracene, which exhibits one-way isomerization from the cis to trans isomer. Although the hydrogen atom transfer has an energy barrier (<2 kcal mol-1), the relative energy of the transition state with zero-point correction is lower than that of trans-2HC. Electronic spins localize around the C=C double bond in the intermediate states (p-2HC and p-2HC′) of isomerization. During the hydrogen atom transfer, electronic spins shift from the phenyl group to the 2-hydroxyphenyl moiety. The electronic charge on hydrogen-bonded proton does not change significantly during the hydrogen atom transfer process.
• Novel crystal structure, Cis-Trans isomerization, and host property of meta-substituted macrocyclic azobenzenes with the shortest linkers

  Y Norikane, K Kitamoto, N Tamaoki

  JOURNAL OF ORGANIC CHEMISTRY 68 (22) 8291 - 8304 0022-3263 2003/10 [Refereed][Not invited]
   

  Azobenzenophanes, in which two (2), three (3), and four (4) azobenzene units are connected cyclically by methylene linkers at the meta positions, were synthesized. The effect of ring strain on the structure and the photochemical and the thermal isomerization of azobenzene were investigated. Complex formation with guest species such as alkali metal cations and solvent molecules was observed. X-ray crystal analyses revealed the crystal structure of all three isomers of 2. Compound 2(t,c) was distorted due to the ring strain and 2(c,c) was not deformed. Both 3 and 4 formed supramolecular channel structures in which an azobenzenophane molecule holds a solvent molecule in the molecular cavity. Upon exposure to light, 2, 3, and 4 exhibited stepwise trans-cis photoisomerization in solutions. The quantum yields for all isomerization steps of 2 were determined, and these values suggested that interactions between chromophores such as energy transfer and/ or steric distortion affect the isomerization process. The lifetime of 2(c,c) (19.7 days) was longer than that of 2(t,c) (6.1 days) at room temperature. The relative stability of these isomers was explained by the isokinetic (or compensation) relationship between DeltaH(double dagger) and DeltaS(double dagger) values and by the effect of the ring strain. The relative energies of three isomers of 2 were estimated by HF/6-31G** calculations, and these values indicated that 2(t,c) has the largest ring strain. Complexes (1:1 and 2:1) between macrocycles and alkali metal cations (Li+, Na+, K+, Rb+, Cs+) were observed by ESIMS. The cation selectivity was shifted upon photoirradiation especially in 4.
• Photochemically driven smectic-cholesteric phase transition in an inherently photoactive dimesogen

  VA Mallia, N Tamaoki

  CHEMISTRY OF MATERIALS 15 (17) 3237 - 3239 0897-4756 2003/08 [Refereed][Not invited]
  
• Synthesis of a mechanically linked oligo[2]rotaxane

  A Belaissaoui, S Shimada, A Ohishi, N Tamaoki

  TETRAHEDRON LETTERS 44 (11) 2307 - 2310 0040-4039 2003/03 [Refereed][Not invited]
   

  A bifunctional [2]rotaxane, bearing two free functional groups each in the ring and axial parts, was synthesized, followed by its polycondensation with methylene diphenyl diisocyanate leading to a mechanically linked oligo[2]rotaxane. (C) 2003 Elsevier Science Ltd. All rights reserved.
• Photochemical phase transition and molecular realignment of glass-forming liquid crystals containing cholesterol/azobenzene dimesogenic compounds

  N Tamaoki, Y Aoki, M Moriyama, M Kidowaki

  CHEMISTRY OF MATERIALS 15 (3) 719 - 726 0897-4756 2003/02 [Refereed][Not invited]
   

  We synthesized dimesogenic liquid crystals with both cholesterol and azobenzene groups by esterification of 10,12-docosadiynedioic acid or docosanedioic acid with 4-alkyl-4'-hydroxyazobenzene (or 4-hydroxyazobenzene) and cholesterol and studied the thermal, optical, and glass-forming properties. Especially, we focused on the effect of the length of the alkyl chain substituted on the azobenzene unit and the photochemical isomerization of the azobenzene unit on the properties of the mesophases of the compounds or a host cholesteric liquid crystal forming stable glass when using them as a dopant. Two compounds without an alkyl chain on the azobenzene unit show a cholesteric phase, while five compounds with an alkyl chain from butyl to hexadecyl show only a smectic phase. The cholesteric reflection bands of the compounds without an alkyl chain on the azobenzene unit shifted toward shorter wavelengths upon photoisomerization of the azobenzene unit from the trans to cis form. Further photoirradiation induced an isotropic phase in the compounds. The compounds with an alkyl chain showing a smectic phase directly changed to an isotropic phase after the photochemical formation of a certain amount of the cis form. All compounds attained a glassy state by maintaining a molecular order if the compounds between the substrates were rapidly cooled from their liquid-crystalline temperature to 0 degreesC. When the compounds were doped with 2-10 wt % of a dicholesteryl ester forming a stable cholesteric glass, the cholesteric band of the mixtures shifted toward shorter wavelengths following the photoisomerization from trans to cis of the azobenzene unit on the dopant. The extent of the shift depends on the irradiation energy, temperature, and length of the alkyl chain on the azobenzene unit. The mixture went into the glassy state, keeping the shifted cholesteric reflection band after rapid cooling from the liquid-crystalline temperature to 0 degreesC. The cholesteric glassy state was stable up to 80 degreesC. Since the molecular arrangement of the liquid-crystalline compounds and the conformation of the azobenzene unit completely returned to the initial state upon reheating to its isotropic temperature, the photoresponsibility and glass-forming property of the compounds or mixtures are applicable to rewritable recording materials.
• Unique crystal structures of donor-acceptor complexes: crossed arrangement of two charge-transfer columns

  M Kidowaki, N Tamaoki

  CHEMICAL COMMUNICATIONS (2) 290 - 291 1359-7345 2003 [Refereed][Not invited]
   

  Unique crystal structures containing two kinds of crossed charge-transfer (CT) columns are demonstrated by cocrystals consisting of ion pairs of acceptors of methyl viologen and anthraquinone disulfonate derivatives and a donor, hydroquinone, mediated by electrostatic and donor-acceptor (DA) interactions.
• Novel supramolecular hydrogen-bonded cholesteric mesogens: liquid crystalline, thermoptical and glass-forming properties

  A Takahashi, VA Mallia, N Tamaoki

  JOURNAL OF MATERIALS CHEMISTRY 13 (7) 1582 - 1587 0959-9428 2003 [Refereed][Not invited]
   

  Liquid crystalline, thermoptical and glass-forming properties of a series of novel supramolecular hydrogen bonded cholesteric mesogens have been described. These assemblies were built via intermolecular hydrogen bonding between cholesteric esters containing pyridine groups and cholesterol containing carboxylic acid moieties. All hydrogen-bonded complexes exhibit well defined cholesteric phases over a range of temperatures depending upon the number of carbon atoms present in their alkyl chains. The formation of pure LC materials on 1 : 1 complexation could be confirmed from the phase diagrams of the binary mixtures and infrared absorption spectra. By rapid cooling of the hydrogen bonded assemblies from their cholesteric temperature to 0 degreesC glassy liquid crystalline films maintaining helical molecular order were obtained. Different reflection colors of the cholesteric phase were selectively and repeatedly fixed by changing the starting temperature of rapid cooling.
• Effects of polymerized photoresponsive additives on cholesteric pitch of medium molecular weight liquid crystals

  H Akiyama, N Tamaoki

  KOBUNSHI RONBUNSHU 60 (10) 575 - 580 0386-2186 2003 [Refereed][Not invited]
   

  Effects of polymeric additives on the cholesteric pitch of medium molecular weight liquid crystals were investigated. Copolymers of an azobenzene acrylate with long alkyl chains and a cholesteryl acrylate prepared by free radical polymerization in solution showed a low compatibility with the cholesteric liquid crystal. Photopolymerization of these monomers in the liquid crystalline phase brought about a dispersible polymer. The liquid crystal cell containing the photopolymerized materials shows shifts of the cholesteric pitch in response to irradiation.
• Photoresponsive vitrifiable chiral dimesogens: photo-thermal modulation of microscopic disordering in helical superstructure and glass-forming properties

  VA Mallia, N Tamaoki

  JOURNAL OF MATERIALS CHEMISTRY 13 (2) 219 - 224 0959-9428 2003 [Refereed][Not invited]
   

  Thermal, photooptical as well as glass-forming properties of a series of photoresponsive chiral dimesogenic compounds containing cholesterol-azobenzene moieties linked to varying alkyl chain lengths (6-14) are described. All compounds except the dimesogen containing 7 methylene spacers show a cholesteric phase. Selective reflections observed in the cholesteric liquid crystals were found to be blue shifted upon increasing the temperature due to variations in smectic fluctuations. X-Ray diffraction studies of these compounds in the cholesteric phase show a low intensity reflection at small angles, the half widths of which decrease on decreasing the temperature, confirming the presence of smectic cybotactic groups. These materials also exhibit a strong odd-even effect in their reflection wavelength as a function of spacer length. Compounds with even numbers of methylene units show a drastic change in their reflection wavelength (102-225 nm) on temperature change compared to those with odd numbers of methylene units (9-14 nm). UV photolysis, using light of 366 nm wavelength, in the cholesteric super-cooled state exhibits a hypsochromic shift in the reflection wavelength. This can be explained by the formation of the cis isomer destroying the smectic clusters in the helical superstructure due to its bent geometry, which in turn causes a decrease in the reflected wavelength. A maximum wavelength shift of 215 nm (703-488 nm) has been observed on photolysis at 80 degreesC (cooling cycle) for the dimesogen having 12-methylene spacers. By rapid cooling of the compounds from the cholesteric temperature to 0 degreesC glassy liquid crystalline films maintaining helical molecular order were obtained. The optical properties of these dimesogens, such as cholesteric reflections, controlled by light and temperature combined with their glass forming properties, can be utilized for the construction of information storage materials.
• [1.1](3,3 ')-azobenzenophane: Novel crystal structure and cis-trans isomerization of distorted azobenzene

  Y Norikane, K Kitamoto, N Tamaoki

  ORGANIC LETTERS 4 (22) 3907 - 3910 1523-7060 2002/10 [Refereed][Not invited]
   

  [GRAPHICS] [1.1](3,3')-Azobenzenophane, in which two azobenzenes are cyclically connected by -CH2- chains at the meta positions, has been synthesized, The crystal structures of all isomers have been revealed. This is the first report on the crystal structure of the cis isomer of macrocyclic azobenzenes. The trans,trans isomer was slightly distorted, the trans,cis isomer highly deformed, and the cis,cis isomer unstrained. The thermal stability of cis isomers in solutions are deducible from the crystal structures.
• DFT study on triplet ground state silylenes revisited: The quest for the triplet silylene must go on

  Masaru Yoshida, Nobuyuki Tamaoki

  Organometallics 21 (13) 2587 - 2589 0276-7333 2002/06/24 [Refereed][Not invited]
   

  The density functional theory on triplet ground state silyenes was presented. Precise calculation methods without an effective core potential approximation was used. The overestimation of the stability of the triplet state of bis(silyl)silylenes was confirmed. The results showed that the quest for the triplet ground state silylene must go until the direct electron spin resonance observation of the unequivocally predicted triplet silylene was accomplished.
• Photochemical control of reflection colors of glass-forming non-polymeric cholesterics with azobenzene chromophore.

  N Tamaoki, M Moriyama

  ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 223 D47 - D47 0065-7727 2002/04 [Refereed][Not invited]
  
• Substituent effects on a photo-induced alternation of the lower critical solution temperatures of Poly(N-isopropylacrylamide) with azobenzene units

  H Akiyama, N Tamaoki

  POLYMER INTERFACES AND THIN FILMS 710 67 - 72 0272-9172 2002 [Refereed][Not invited]
   

  We synthesized copolymers of N-isopropylacrylamide (NIPAM) and azobenzene-containing acrylates or acrylamides by free radical polymerization, and investigated the water solubility of these polymers upon irradiation with ultra-violet and visible light. The solubility depended on concentration and structure of photoreactive azobenzene unit in the polymers. The soluble polymers showed the lower critical solution temperature, which was varied along with light irradiation. Photo-induced large wettability alteration was observed in the film.
• Photochemical control of helical pitch of glass-forming dimeric cholesteric liquid crystals by isomerization of embedded di-mesogenic compounds with both cholesterol and azobenzene groups

  N Tamaoki, Y Aoki, M Moriyama, M Kidowaki

  LIQUID CRYSTALS VI 4799 103 - 112 0277-786X 2002 [Refereed][Not invited]
   

  We synthesized di-mesogenic liquid crystals with both cholesterol and azobenzene groups by esterification of 10,12-docosadiynedioic acid or docosanedioic acid with 4-alkyl-4'-hydroxyazobenzene (or 4-hydroxyazobenzene) and cholesterol. Two compounds without an alkyl chain on the azobenzene unit show cholesteric and smectic phases, while five compounds with an alkyl chain from butyl to hexadecyl show only a smectic phase. When the compounds were doped in 2-10 w% to a dicholesteryl ester forming stable cholesteric glass, the mixture became photo-responsive. Upon irradiation at 366 nm, the cholesteric band of the mixtures shifted toward shorter wavelength caused by the photo-isomerization from trans to cis of the azobenzene unit on the dopant. The extent of the shift depends on irradiation energy, temperature and the length of the alkyl chain on the azobenzene unit. When a thin film of the dicholesteryl compounds containing 5 w% of the dopant having a heptyl substituent on the azobenzene unit was irradiated at 90 degreesC, the reflection band shifted from 730 nm (infrared) to 490 nm (blue). The mixture went into the glassy state keeping the shifted cholesteric reflection band after rapid cooling from the liquid crystalline temperature to 0 degreesC. The cholesteric glassy state was stable up to 80 degreesC. Since the molecular arrangement of the dicholesteryl compound and the conformation of the doped azobenzene derivatives completely returned to the initial state upon reheating to isotropic temperature, the photo-responsibility and glass-forming property of the mixture is applicable to full-color rewritable recording materials.
• Thermal and optical properties of newly synthesized dicholesteryl esters with a phenylene oxide link in the normal and solidified cholesteric phases

  N Tamaoki, H Matsuda

  LIQUID CRYSTALS 28 (12) 1823 - 1829 0267-8292 2001/12 [Refereed][Not invited]
   

  A series of liquid crystalline compounds with a central phenylene oxide group to which two cholesteryl groups are attached via two alkanoate spacers has been synthesized and investigated. All the compounds except the one with ethanoate spacers showed a cholesteric phase as a single mesophase. The phase transition temperatures, the corresponding enthalpy changes and the wavelengths of selective reflection associated with the cholesteric phases showed a strong odd-even effect as a function of the spacer length. By rapid cooling of the compounds from the cholesteric phase to 0 degreesC, solid films maintaining a cholesteric molecular order were obtained. At room temperature, the solid film showed stable cholesteric colours controlled by changing the temperature at which the rapid cooling was begun. Heating the cholesteric solid film of the compound with hexanoate spacers gave two forms of crystals above 80 degreesC, whose ratio changed depending on the colour of the starting solid films. This result suggests the existence of two conformational isomers in the liquid crystalline state. Since it is possible repeatedly to fix stable red, green and blue colours by thermal treatment of this compound, we may apply it to a rewritable full colour recording in the thermal mode.
• Photo-controllable and fixative optical properties of non-polymeric liquid crystals with azobenzene chromophore

  M Moriyama, N Tamaoki

  CHEMISTRY LETTERS (11) 1142 - 1143 0366-7022 2001/11 [Refereed][Not invited]
   

  A new series of non-polymer photochromic liquid crystalline compounds which form glassy solids maintaining the liquid crystalline molecular alignment has been synthesized; their optical properties such as cholesteric reflections, controlled by the intramolecular photoreaction and temperature, can be utilized for the construction of information-storing materials.
• Cholesteric liquid crystals for color information technology

  N Tamaoki

  ADVANCED MATERIALS 13 (15) 1135 - + 0935-9648 2001/08 [Refereed][Not invited]
   

  Fixation of the molecular ordering of cholesteric liquid crystals is essential for use of these materials in color information technology.. Methods to achieve this as well as thermal and photochemical control of the cholesteric pitch of the liquid crystals are addressed and applications in rewritable color recording are highlighted. The Figure shows a sample recorded using a laser.
• Effects of doped dialkylazobenzenes on helical pitch of cholesteric liquid crystal with medium molecular weight: utilisation for full-colour image recording

  M Moriyama, S Song, H Matsuda, N Tamaoki

  JOURNAL OF MATERIALS CHEMISTRY 11 (4) 1003 - 1010 0959-9428 2001 [Refereed][Not invited]
   

  The effects of small amounts of achiral photochromic dopants, 4,4'-di-n-alkylazobenzenes, with various lengths of substituted alkyl chain (CnH2n+1:n = 4, 7, 11, 12, 13, 14, 15, 16) on the helical pitch of a cholesteric liquid crystal (CLC) with ca. 1000 molecular weight were investigated in order to utilise the cholesteric reflected colour of these combinations for a rewritable colour image recording. The (E)-azobenzenes (similar to2 wt%) in the host CLC induced pitch changes dependent on temperature, the concentration of the azobenzenes and the length of substituted alkyl chain on the azobenzenes. In the low region of the cholesteric temperature (below 100 degreesC), some (E)-azobenzenes remarkably lengthened the pitch. Contrary to this, upon irradiation, E-Z photoisomerization of all the azobenzenes in the CLC phase induced consecutive pitch shortenings in response to the formation of the Z isomers. The changed pitch (reflected colour) could be fixed in cholesteric glassy solids. In the glassy solid state, the photo and thermal isomerization of the azobenzenes could not influence the cholesteric pitch any longer, therefore, the colour was stably stored. However, since the molecular arrangement of the CLC and the conformation of the doped azobenzenes completely returned to the initial state upon re-heating to isotropic temperatures, the stored colour could be easily erased. Based on these fundamental investigations, it is suggested that the mixed systems of the medium-molecular-weight CLCs and the 4,4'-dialkylazobenzenes will be effective materials for a rewritable full-colour image recording in a photon mode.
• Photoinduced alignment of nematic liquid crystal on the polymer surface microrelief

  A Parfenov, N Tamaoki, S Ohni-Shi

  MOLECULAR CRYSTALS AND LIQUID CRYSTALS 359 487 - 495 1058-725X 2001 [Refereed][Not invited]
   

  Polymer film surface modified in the holographic process under the laser illumination was used for nematic liquid crystal (LC) alignment. Azobenzene - containing polyurethanes were taken fur a material of the film. A relief grating inscribed by laser illumination onto the surface of these polymers induced a reorientation of LC director from initial homeotropic alignment. Possible applications of described processes include command-surface creation for liquid crystal displays, reversible and adaptable in real-time liquid crystal structures for laser beam targeting and aiming, etc.
• Polymerization of a diacetylene dicholesteryl ester having two urethanes in organic gel states

  N Tamaoki, S Shimada, Y Okada, A Belaissaoui, G Kruk, K Yase, H Matsuda

  LANGMUIR 16 (19) 7545 - 7547 0743-7463 2000/09 [Refereed][Not invited]
  
• Photoinduced alignment of nematic liquid crystal on the polymer surface microrelief

  A Parfenov, N Tamaoki, S Ohnishi

  JOURNAL OF APPLIED PHYSICS 87 (4) 2043 - 2045 0021-8979 2000/02 [Refereed][Not invited]
   

  A polymer film surface modified by laser illumination was used as a command surface for nematic liquid crystal (LC). Azobenzene-containing polyurethanes were taken for the material of the film. A relief grating inscribed by laser illumination onto the surface of these polymers induced a reorientation of the LC director from the initial homeotropic alignment. Possible applications of the described processes include command-surface creation for liquid-crystal displays, reversible and adaptable liquid-crystal structures for laser-beam targeting and aiming, etc. (C) 2000 American Institute of Physics. [S0021-8979(00)07604-0].
• Cholesteric solid films formed by spin-coating solutions of dicholesteryl esters

  N Tamaoki, M Moriyama, H Matsuda

  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 39 (3) 509 - + 1433-7851 2000 [Refereed][Not invited]
  
• Rewritable full-color recording in a photon mode

  N Tamaoki, S Song, M Moriyama, H Matsuda

  ADVANCED MATERIALS 12 (2) 94 - 97 0935-9648 2000/01 [Refereed][Not invited]
  
• Optical and liquid crystalline properties of dicholesteryl derivatives having different configurations of the hydrocarbon linkages

  G Kruk, N Tamaoki, H Matsuda, Y Kida

  LIQUID CRYSTALS 26 (11) 1687 - 1693 0267-8292 1999/11 [Refereed][Not invited]
   

  The liquid crystalline and optical properties of four dicholesteryl derivatives having various linkage configurations, but with the same number of connecting carbons (18), have been investigated, using differential scanning calorimetry, polarizing optical microscopy, Fourier transform infrared (FTIR) spectroscopy and UV-Vis spectroscopy. Quite different phase behaviours and optical properties have been found for these compounds, while all of them exhibited the behaviour specific for a cholesteric phase. By rapid cooling from the cholesteric phase to 0 degrees C, the iridescent colours of some of the dicholesteryl esters were fixed in the cholesteric glassy state. It was difficult but possible to fix various stable colours in the cholesteric glassy state of one compound with a polymethylene (CH2)(18) linking chain. It was much easier to fix less stable colours for samples with the linking groups (CH2)(6) and C=C double bonds between them. Very unstable colours could also be fixed for the compound with the (CH2)(7) chains and a diyne group. The fourth compound with a branched linking chain gave a cholesteric phase which showed colours at room temperature. FTIR spectroscopy measurements provided interesting results concerning the average change in molecular configuration between the blue cholesteric glass and the crystal for the compound with the (CH2)(7) polymethylene chains which crystallized within a few hours; also frequency changes associated with some bands were found and reported.
• Optical and thermal properties of cholesteric solid from dicholesteryl esters of diacetylenedicarboxylic acid

  N Tamaoki, G Kruk, H Matsuda

  JOURNAL OF MATERIALS CHEMISTRY 9 (10) 2381 - 2384 0959-9428 1999/10 [Refereed][Not invited]
   

  Dicholesteryl esters of diacetylenedicarboxylic acid with different lengths of methylene linkages were synthesised. Compounds with (CH2)(n)(n=2, 4, 5, 6, 7, 8, 10) showed a cholesteric phase. Phase transition temperatures from the isotropic phase to the anisotropic phase showed an odd-even effect of the number of (CH2) units. By rapid cooling from the cholesteric phase to 0 degrees C, the compounds were solidified retaining the cholesteric colours (cholesteric solid), some of which were stable at room temperature. Changing the temperature at which rapid cooling started changed the colours of the cholesteric solid. The thermal stability of the cholesteric solid also showed an odd-even effect of the number of (CH2) units. The effect can be explained by the difference in the stable structures of the molecules and the strength of the weak intermolecular interactions via carbonyl groups between the compounds with odd and even (CH2), which was observed in the FT-IR spectra.
• Laser recording on a solid cholesteric glass of a medium-molecular-weight compound

  N Tamaoki, T Terai, H Matsuda

  JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 37 (11) 6113 - 6114 0021-4922 1998/11 [Refereed][Not invited]
   

  The possibility of laser-addressing a new full color recording material, that is, a solid film of a medium-molecular weight cholesteric compound, was investigated. A red image was clearly recorded on the blue background by laser-heating using CO2 laser followed by natural cooling. By increasing the laser power, the fixed color is changed from red to yellow and then to blue. A resolution of about 500 mu m, that should depend on the profile of the laser beam, was obtained after 1 s of recording time.
• Synthesis and switchable condensation reaction of bifunctional [2]catenane

  S Shimada, K Ishikawa, N Tamaoki

  ACTA CHEMICA SCANDINAVICA 52 (3) 374 - 376 0904-213X 1998/03 [Refereed][Not invited]
  
• Diffraction-based spatial light modulation: Transverse linear electrooptic effect in polymers

  K Harada, M Itoh, IN Kompanets, H Matsuda, AV Parfenov, N Tamaoki, T Yatagai

  OPTICAL REVIEW 5 (2) 89 - 92 1340-6000 1998/03 [Refereed][Not invited]
   

  We propose a new type of spatial light modulator using nonlinear organic polymer film as a phase modulation element. Using polymer poly-Disperse Red-19 Toluendiiso-cyanate, a more than 150:1 contrast ratio has been realized for electrical addressing in transverse geometry.
• Photomodification of polymer films: azobenzene-containing polyurethanes

  M Itoh, K Harada, H Matsuda, S Ohnishi, A Parfenov, N Tamaoki, T Yatagai

  JOURNAL OF PHYSICS D-APPLIED PHYSICS 31 (5) 463 - 471 0022-3727 1998/03 [Refereed][Not invited]
   

  New results are presented on optical recording to the films of polymers substituted with azo dyes. Holographic gratings are formed in the polyurethane films by exposure to Ar(+) laser light without any post-treatment as in previous works using polyacrylates, epoxy-based polymers and polyesters substituted with azo dyes. It is shown for the first time that the principal mechanism of optical recording could be the mass transfer of polymers during the cis-trans isomerization of azo dye units on the polymers from illuminated areas to non-illuminated areas. Besides this transport, some irreversible photochemical reactions involving atmospheric oxygen are suggested as another possible origin for the holographic recording.
• Thermally stable iridescent colors of a new low-molecular-weight cholesteric compound in the solid state and the application to full-color recording

  N Tamaoki, AV Parfenov, A Masaki, H Matsuda

  ELECTRICAL, OPTICAL, AND MAGNETIC PROPERTIES OF ORGANIC SOLID-STATE MATERIALS IV 488 915 - 919 0272-9172 1998 [Refereed][Not invited]
   

  We synthesized a series of new di-cholesteryl esters of several diacids. One of the compounds containing both of a diyne unit and long alkylene units, in the form of a thin solid film, showed stable iridescent colours in the visible region after rapid cooling process from the temperature of the cholesteric liquid crystalline phase. Measurement of selective reflectance of visible light, X-ray diffraction, optical rotation dispersion of the solid films proved that the films remained the cholesteric ordering of the molecules. The cholesteric structure in the solid films were completely stable at room temperature. The colour of the solid film was totally, partially or in imagewise manner changed into selected colours by adjusting the temperature of the surface just before the rapid cooling process. The property of this compound can be applicable to memory media with high density using the spectrum of light, or to thermosensitive full-colour recording materials.
• Rewritable full-color recording on a thin solid film of a cholesteric low-molecular-weight compound

  N Tamaoki, AV Parfenov, A Masaki, H Matsuda

  ADVANCED MATERIALS 9 (14) 1102 - 1104 0935-9648 1997/11 [Refereed][Not invited]
  
• Synthesis of rotaxanes with functional groups

  N Tamaoki, S Shimada

  ACTA CHEMICA SCANDINAVICA 51 (11) 1138 - 1140 0904-213X 1997/11 [Refereed][Not invited]
  
• Photoreversible optical nonlinearities of polymeric films containing spiropyran with long alkyl chains

  N Tamaoki, E VanKeuren, H Matsuda, K Hasegawa, T Yamaoka

  APPLIED PHYSICS LETTERS 69 (9) 1188 - 1190 0003-6951 1996/08 [Refereed][Not invited]
   

  It was demonstrated that the third-order optical nonlinearity of polymer films could be reversibly controlled by the photochromic conversion and following J-aggregate formation of spiropyr;tn embedded in an inert polymer matrix. Patterns consisting of areas with high and low third-order nonlinear optical activities were prepared by imagewise exposure of the photochromic films followed by thermal treatment to form thermally stable J aggregates of photoinduced merocyanine in the exposed area. This system could be useful in developing new unconventional optical devices based on optical nonlinearities, including new types of spatial light modulators. (C) 1996 American Institute of Physics.
• Photochemistry of benzenediazonium anthracenesulfonates: Photolysis of benzenediazonium salts by excitation of the anion

  Nobuyuki Tamaoki, Yasushi Takahashi, Tsuguo Yamaoka

  Journal of the Chemical Society, Chemical Communications (15) 1749 - 1750 0022-4936 1994 [Not refereed][Not invited]
   

  4-Substituted benzenediazonium 1,8-dimethoxyanthracene-3-sulfonates photodecompose under visible light, which is absorbed only by the anionic part, via intra-ion pair electron transfer from the excited anionic part to the benzene diazonium.
• Thermo-optic effects of 4-alkoxy-3-chlorobenzoic acids in polymeric matrices

  Yasushi Takahashi, Nobuyuki Tamaoki, Yuichi Komiya, Yoshihiro Hieda, Kenichi Koseki, Tsuguo Yamaoka

  Journal of Applied Physics 74 (6) 4158 - 4162 0021-8979 1993 [Not refereed][Not invited]
   

  Polymer films containing 4-alkoxy-3-chlorobenzoic acid heated to 140°C showed two optically different states at room temperature depending on the cooling rate. If after heating the film cooled rapidly, it froze in the transparent state. In contrast, it reverted to the light scattering state when cooled slowly. Cycles between the two optical states were reproducible, therefore these films may offer potential as a rewritable recording material. The reversibility in the optical transmittance may be caused by a reversible change in the crystal size of the acid in the polymer matrix.
• Photo- and thermal cis-trans isomerization of [23](4,4′) azobenzenophane

  Nobuyuki Tamaoki, Kenichi Koseki, Tsuguo Yamaoka

  Journal of the Chemical Society, Perkin Transactions 2 1107 - 1110 1472-779X 1992/12/01 [Not refereed][Not invited]
   

  Four isomers, EEE, EEZ, EZZ and ZZZ, exist for [2 3 ] (4,4′)azobenzenophane depending on the degree of the isomerization of three azobenzene units. These isomers are stable enough to be separated by reversed-phase liquid chromatography. The compound in methanol exists as the EEE form in the dark. Upon irradiation at 366 nm the EEE form isomerizes via the EEZ form and the EZZ form to the ZZZ form. At the photostationary state at 366 nm, 85% of the compound exists as the ZZZ form. From the photostationary state the compound thermally isomerizes gradually to the EEE form. The thermal reaction from the ZZZ form to the EEE form also proceeds in a stepwise fashion. The relative values of the quantum yields for the photoisomerization and the absolute value of the rate for the thermal isomerization have been determined for each step. Both the photo- and thermal processes in the Z → E direction show the different efficiencies (or rates) depending on the processes. These experimental results can be explained by supposing that the different degree of ring strain works for ground and (or) excited states of each isomer. In this compound, a certain isomer can be enriched by the combination of external stimuli, such as light or heat. This raises the possibility of synthesizing molecules with more than two functional states.
• A PHOTOCHROMIC MEMORY WITH A NONDESTRUCTIVE READ-OUT PROPERTY

  N TAMAOKI, S YOSHIMURA, T YAMAOKA

  THIN SOLID FILMS 221 (1-2) 132 - 139 0040-6090 1992/12 [Not refereed][Not invited]
   

  Isomerizations of [2.2](4,4')-azobenzenophane (1) in polycarbonate films were investigated spectrophotometrically, and the light-intensity dependent efficiency of the photoisomerization of macrocyclic azobenzene dimers, including 1, was analyzed theoretically. It is demonstrated that the efficiency of photoisomerization of 1 is dependent on the light intensity, even in a polymer film. A correlation between the lifetimes of the trans-cis isomers of macrocyclic azobenzene dimers and light intensities, where the efficiency of photoisomerization becomes dependent on light intensity, is also described. A photochromic memory composed of 1 and polycarbonate shows a non-destructive read-out property.
• Light-intensity dependence in the photochromism of dibenzo[2.2](4,4′) -azobenzenophane

  Nobuyuki Tamaoki, Tsuguo Yamaoka

  Journal of the Chemical Society, Perkin Transactions 2 873 - 878 1472-779X 1991/12/01 [Not refereed][Not invited]
   

  Reduction of 4′,4″-dinitro-o-terphenyl under conditions of high dilution, produces a mixture of macrocyclic poly(azobenzene) compounds. From the mixture, three kinds of macrocycle, namely, dimer 2 {dibenzo[2.2](4, 4′)azobenzenophane}, trimer 3 and tetramer 4 have been isolated pure. In toluene, absorption peaks due to the π → π* transition for the macrocycles undergo dramatic hypsochromic shifts as the ring size of the macrocycles decreases from the trimer 3 to the dimer 2; this is an indication that benzene rings at both ends of the dimer 2 are fixed perpendicularly to two azobenzene planes in the macrocycle. The photostationary state of the dimer 2 in toluene at λ = 366 nm contained the EZ isomer which undergoes thermal isomerization to the more stable EE isomer at the first-order rate of 0.768 s -1 . The reaction of 2 is much faster than that of the dimer 5, which was described in our last paper. Due to the fast thermal EZ to EE isomerization, the efficiency of the photoisomerization from the EE isomer to the ZZ isomer is light-intensity dependent. This dependence is observed at higher light intensities for the dimer 2 than for the dimer 5.
• LIGHT-INTENSITY DEPENDENCE IN THE PHOTOCHROMISM OF DIBENZO[2.2](4.4')-AZOBENZENOPHANE

  N TAMAOKI, T YAMAOKA

  JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 (6) 873 - 878 0300-9580 1991/06 [Refereed][Not invited]
   

  Reduction of 4',4"-dinitro-o-terphenyl under conditions of high dilution produces a mixture of macrocyclic poly(azobenzene) compounds. From the mixture, three kinds of macrocycle, namely, dimer 2 {dibenzo[2.2](4,4')azobenzenophane}, trimer 3 and tetramer 4 have been isolated pure. In toluene, absorption peaks due to the pi --> pi* transition for the macrocycles undergo dramatic hypsochromic shifts as the ring size of the macrocycles decreases from the trimer 3 to the dimer 2; this is an indication that benzene rings at both ends of the dimer 2 are fixed perpendicularly to two azobenzene planes in the macrocycle. The photostationary state of the dimer 2 in toluene at lambda = 366 nm contained the EZ isomer which undergoes thermal isomerization to the more stable EE isomer at the first-order rate of 0.768 s-1. The reaction of 2 is much faster than that of the dimer 5, which was described in our last paper. Due to the fast thermal EZ to EE isomerization, the efficiency of the photoisomerization from the EE isomer to the ZZ isomer is light-intensity dependent. This dependence is observed at higher light intensities for the dimer 2 than for the dimer 5.
• THE PHOTOISOMERIZATION AND THERMAL CIS-TRANS ISOMERIZATION OF [23](4,4')AZOBENZENOPHANE

  N TAMAOKI, K KOSEKI, T YAMAOKA

  TETRAHEDRON LETTERS 31 (23) 3309 - 3312 0040-4039 1990 [Not refereed][Not invited]
   

  The cis-trans isomerization of the title compound in methanol has been investigated kinetically by HPLC, confirming the existence of relatively stable four isomers and giving the thermodynamic parameters of the isomerization among the isomers. © 1990.
• [2.2](4,4')AZOBENZENOPHANE - SYNTHESIS, STRUCTURE, AND CIS-TRANS ISOMERIZATION

  N TAMAOKI, K OGATA, K KOSEKI, T YAMAOKA

  TETRAHEDRON 46 (17) 5931 - 5942 0040-4020 1990 [Not refereed][Not invited]
   

  The title compound 2 was synthesized by the reduction of 1,2-bis(4'-nitrophenyl) ethane. Spectral data and results of X-ray crystal structure analyses suggest that facing two azobenzene units in 2 are deformed from the planes both in solution and crystal. The cis-cis form of2 (cc-2), which was generated photochemically, isomerized thermally via the transcis form (tc-2), whose life time was only 22 second at 25°C, to the trans-trans form (tt-2). Due to a short life time of tc-2, the efficiency of photo-isomerization of 2 from tt-2 to cc-2 became light intensity dependent. © 1990.
• [2.2](4,4')AZOBENZENOPHANE

  N TAMAOKI, K KOSEKI, T YAMAOKA

  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH 29 (1) 105 - 106 0570-0833 1990/01 [Not refereed][Not invited]
   

  The long sought after [2,2]azobenzenophane 1 has been prepared quite simply by reduction of l,2‐bis(4‐nitrophenyl)ethane. According to 1 H‐NMR and UV/VIS spectra the CNNC moiety in 1 is noticeably bent. Photochemically generated cis,cis‐1 isomerizes 10000 times more slowly to the trans,trans‐form than does the cis,trans‐isomer. (Figure Presented.) Copyright © 1990 by VCH Verlagsgesellschaft mbH, Germany
• HISTOCHEMISTRY OF BUNGAROTOXIN BINDING-SITES AT ELECTRON-MICROSCOPIC LEVEL

  N TAMAOKI, S YOSHIMURA, A AKATSUKA

  ACTA HISTOCHEMICA ET CYTOCHEMICA 15 (4) 592 - 599 0044-5991 1982 [Refereed][Not invited]
  

Books etc

• Molecular photoswitches : chemistry, properties, and applications

  Tamaoki, Nobuyuki, Pianowski, Zbigniew L. etc 
  Wiley-VCH 2022 (ISBN: 9783527351046) xx p., p. 477-1112
• 光機能性有機・高分子材料の新局面（分著）

  シーエムシー出版 2002
• 光を制御する次世代高分子・超分子（分著）

  高分子学会編 2000

MISC

• Synthesis and isomerization behavior of azobenzene derivatives with metal-responsive moieties

  平山湧人, 玉置信之, 和泉雅之, 越智里香  ホスト-ゲスト・超分子化学シンポジウム講演要旨集  19th-  2022
• リン脂質アゾベンゼンベシクルと疎水性基を含む水溶性高分子とのゾル-ゲル転移と外部刺激応答性

  佐藤大介, KIM Sunnam, 深港豪, 蟹江澄志, 村松淳司, 秋山陽久, 玉置信之, 栗原清二  日本化学会春季年会講演予稿集(CD-ROM)  99th-  2019
• 高い光重合率を有するL‐アラニン末端型ジアセチレンゲル化剤の合成と特性評価

  内田啓太, 植田美里, 玉置信之, 青木健一  ポリマー材料フォーラム講演予稿集  26th-  84  2017/11/01  [Not refereed][Not invited]
  
• 脂環末端型ジアセチレン有機ゲル化剤の合成と光パターニング材料への応用

  寺内賢太郎, 伊藤誠一郎, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  26th-  83  2017/11/01  [Not refereed][Not invited]
  
• ジアセチレン誘導体の2成分混合によるハイブリッド型ゲルネットワークの形成と光重合ゲルの高性能化

  小谷昌輝, 高橋大樹, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  26th-  82  2017/11/01  [Not refereed][Not invited]
  
• 一本鎖アゾベンゼンリン脂質ベシクルとキトサンからのゲルの作製とその刺激応答性

  内田真琴, 深港豪, 玉置信之, 秋山陽久, 蟹江澄志, 蟹江澄志, 村松淳司, 村松淳司, 栗原清二, 栗原清二  高分子学会予稿集(CD-ROM)  66-  (2)  ROMBUNNO.2Pc071  2017/09/06  [Not refereed][Not invited]
  
• 新規ジスチリルベンゼン系メカノフルオロクロミック材料の合成と発光挙動

  金子凌平, 荒拓哉, 米田祥二, 相良剛光, 玉置信之, 中野英之  万有札幌シンポジウム  29th-  60  2017/07/01  [Not refereed][Not invited]
  
• ヘテロ型シクロファンが示す過冷却ネマチック相とその外部刺激応答発光特性

  相良剛光, 玉置信之  日本化学会春季年会講演予稿集(CD-ROM)  97th-  ROMBUNNO.3F8‐17  2017/03/03  [Not refereed][Not invited]
  
• 可逆的に光制御できるキネシン阻害剤の開発とその応用

  Kazuya Matsuo, Nobuyuki Tamaoki  日本化学会春季年会講演予稿集(CD-ROM)  97th-  ROMBUNNO.2E7‐04  2017/03/03  [Not refereed][Not invited]
  
• 新規アゾベンゼン三リン酸によるキネシンの駆動とin vitro光制御

  芦野史弥, 松尾和哉, 玉置信之  日本化学会春季年会講演予稿集(CD-ROM)  97th-  ROMBUNNO.2E7‐03  2017/03/03  [Not refereed][Not invited]
  
• 1,4‐Bis(2‐cyano‐2‐{4‐[5‐(4‐methylphenyloxy)pentyloxy]phenyl}‐ethenyl)‐2,5‐dimethoxybenzeneの合成と発光挙動

  金子凌平, 荒拓哉, 米田祥二, 相良剛光, 玉置信之, 中野英之  日本化学会春季年会講演予稿集(CD-ROM)  97th-  ROMBUNNO.2E7‐49  2017/03/03  [Not refereed][Not invited]
  
• 二成分混合による高性能な光重合性有機ゲルの開発

  小谷昌輝, 高橋大樹, 楢崎健太, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  25th-  69  2016/10/26  [Not refereed][Not invited]
  
• 高い重合活性を示すジアセチレン有機ゲル膜を用いた導電性ポリマーの光パターニング

  高橋大樹, 楢崎健太, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  25th-  68  2016/10/26  [Not refereed][Not invited]
  
• 入手しやすい光学活性部位であるアミノ酸残基を末端に有する光重合性ジアセチレンゲル化剤の合成と特性評価

  植田美里, 小林佑子, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  25th-  70  2016/10/26  [Not refereed][Not invited]
  
• モータータンパク質の運動の時空間光制御

  玉置信之  日本分析化学会年会講演要旨集  65th-  159  2016/08/31  [Not refereed][Not invited]
  
• ジアセチレンゲル化剤の二成分混合による光重合特性の制御

  小谷昌輝, 高橋大樹, 楢崎健太, 玉置信之, 青木健一, 青木健一  高分子学会予稿集(CD-ROM)  65-  (1)  ROMBUNNO.1Pf102  2016/05/10  [Not refereed][Not invited]
  
• モータータンパク質キネシンを光制御する新規アゾベンゼン連結ペプチド

  松尾和哉, 玉置信之  日本化学会春季年会講演予稿集(CD-ROM)  96th-  ROMBUNNO.1D3‐11  2016/03/10  [Not refereed][Not invited]
  
• 機械的刺激と熱刺激により発光色が固相で変化するシクロファン

  相良剛光, SIMON Yoan, 玉置信之, WEDER Christoph  日本化学会春季年会講演予稿集(CD-ROM)  96th-  ROMBUNNO.2D3‐25  2016/03/10  [Not refereed][Not invited]
  
• 光応答性ナノ集合体のナノ組織構造動的制御と生体機能開拓への展開

  蟹江澄志, 村松淳司, 栗原清二, 深港豪, 玉置信之, KIM Yuna, 秋山陽久  東北大学多元物質科学研究所研究発表会講演予稿集  16th-  81  2016  [Not refereed][Not invited]
  
• 高い重合活性を示すジアセチレンゲル化剤の開発とゲル中へのポリジアセチレンパターンの形成

  高橋大樹, 楢崎健太, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  24th-  64  2015/11/11  [Not refereed][Not invited]
  
• 末端にアミノ酸構造を有するジアセチレン有機ゲル化剤のゲル化および光重合特性

  小林佑子, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  24th-  66  2015/11/11  [Not refereed][Not invited]
  
• 芳香環末端型ジアセチレンゲル化剤の構造最適化による有機ゲル中での高効率な光重合

  楢崎健太, 高橋大樹, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  24th-  63  2015/11/11  [Not refereed][Not invited]
  
• アラニンベンジルエステル部位を末端に有する光重合性ジアセチレンゲル化剤の合成と特性評価

  植田美里, 小林佑子, 玉置信之, 青木健一, 青木健一  ポリマー材料フォーラム講演予稿集  24th-  65  2015/11/11  [Not refereed][Not invited]
  
• 芳香環末端型ジアセチレンゲル化剤のアルキレン鎖長が光重合速度に及ぼす新規な偶奇効果の発現

  楢崎健太, 堀次恒介, 山本毅, 玉置信之, 青木健一  日本化学会講演予稿集  95th-  (3)  725  2015/03/11  [Not refereed][Not invited]
  
• 高い光重合活性を示すジアセチレン有機ゲル膜中へのポリジアセチレンパターンの作製

  高橋大樹, 楢崎健太, 玉置信之, 青木健一  日本化学会講演予稿集  95th-  (3)  929  2015/03/11  [Not refereed][Not invited]
  
• アミノ酸系ジアセチレンゲル化剤の化学構造変化によるゲル化および光重合特性の向上

  小林佑子, 堀次恒介, 玉置信之, 青木健一  日本化学会講演予稿集  95th-  (3)  725  2015/03/11  [Not refereed][Not invited]
  
• Construction of Molecular Robot Capable of Seeing, Making a Judgement and Taking Actions

  玉置信之  生物物理  55-  (4)  203-205 (J-STAGE)  2015  [Not refereed][Not invited]
  
• 1B06 Dimeric chiral azobenzene dopants exhibiting unusual photoswitching behavior of helical twisting power in cholesteric liquid crystal

  KIM Yuna, TAMAOKI Nobuyuki  Proceedings of Japanese Liquid Crystal Society Annual meeting  2015-  (0)  _1B06  -1_-_1B06-2  2015  [Not refereed][Not invited]
   

  Dimeric dopants were designed and synthesized for a cooperative effect which originates from two different mesogen units - a cholesterol and an azobenzene moiety connected with a flexible alkylenedioxy bridge. Reversible photoisomerization of azobenzene unit accompanied the unusual switching manner of helical pitch and its helical twisting power (HTP, β), exhibiting larger HTP value in cis-rich state (bent-form). Moreover, based on the large HTP switching upon UV and visible light irradiation (Δβ/β_ini of 50 %), a rotational motion of micro-objects was successfully achieved by the rotational reorganization of the cholesteric helix.
• Construction of Molecular Robot Capable of Seeing, Making a Judgement and Taking Actions

  TAMAOKI Nobuyuki  Seibutsu Butsuri  55-  (4)  203  -205  2015  [Not refereed][Not invited]
  
• 芳香環末端を有するジアセチレンゲル化剤~分子集合状態とゲル特性との相関

  楢崎健太, 堀次恒介, 山本毅, 玉置信之, 青木健一  高分子学会予稿集(CD-ROM)  63-  (2)  ROMBUNNO.1PB048  2014/09/03  [Not refereed][Not invited]
  
• アミノ酸系ジアセチレンゲル化剤の特性評価~化学構造がゲル化および光重合挙動に与える影響~

  小林佑子, 堀次恒介, 玉置信之, 青木健一  高分子学会予稿集(CD-ROM)  63-  (2)  ROMBUNNO.1PA049  2014/09/03  [Not refereed][Not invited]
  
• 生体分子機械のスマートコントロール アゾベンゼンの光異性化によるモータータンパク質機能の光制御

  深港豪, 亀井敬, 玉置信之  光化学  45-  (2)  80  -83  2014/08/20  [Not refereed][Not invited]
  
• Smart control of biomolecular machines : Photocontrol of the motile property of motor proteins based on the photoisomerization of azobenzene

  深港 豪, 亀井 敬, 玉置 信之  光化学 : 光化学協会誌  45-  (2)  80  -83  2014/08  [Not refereed][Not invited]
  
• 芳香環末端を有する新規なジアセチレンゲル化剤の合成と特性解析~アルキレン鎖長がゲル化および光重合特性に与える影響~

  楢崎健太, 山本毅, 堀次恒介, 玉置信之, 青木健一  日本化学会講演予稿集  94th-  (3)  1018  2014/03/12  [Not refereed][Not invited]
  
• リン酸基を有する水溶性アゾベンゼン誘導体の高速cis‐trans熱異性化挙動とそのpH・添加物依存性

  越智里香, PERUR Nishad, 吉田一迅, 玉置信之  日本化学会講演予稿集  94th-  (3)  802  2014/03/12  [Not refereed][Not invited]
  
• アミノ酸誘導体を末端に持つ新規なジアセチレン系ゲル化剤の合成とその特性

  小林佑子, 堀次恒介, 玉置信之, 青木健一  日本化学会講演予稿集  94th-  (3)  1018  2014/03/12  [Not refereed][Not invited]
  
• 光応答性ATPアナログによるF₁‐ATPaseの活性と回転の制御

  砂村栄一郎, 亀井敬, 紺野宏紀, 玉置信之, 久堀徹  日本生体エネルギー研究会討論会講演要旨集  39th-  74  -75  2013/12/18  [Not refereed][Not invited]
  
• シンプルな化学構造を持つジアセチレンゲル化剤の合成と光重合により生じるポリジアセチレンのπ共役連鎖長制御

  堀次恒介, 原拓也, 山本毅, 玉置信之, 青木健一  ポリマー材料フォーラム講演予稿集  22nd-  46  2013/11/13  [Not refereed][Not invited]
  
• 両親媒性アゾベンゼン誘導体を用いた微小管機能の光制御

  深港豪, 亀井敬, 島知弘, 岡田康志, 玉置信之  光化学討論会講演要旨集  2013-  65  2013/09/07  [Not refereed][Not invited]
  
• シンプルな化学構造を有する新規なジアセチレンゲル化剤の合成~分子構造とゲルの諸物性の相関性の検討~

  堀次恒介, 伊藤誠一郎, 原拓也, 玉置信之, 青木健一  高分子学会予稿集(CD-ROM)  62-  (2)  ROMBUNNO.2J06  2013/08/28  [Not refereed][Not invited]
  
• 新規ジアセチレン系ゲル化剤の合成とその特性:末端光学活性部位がゲル化および光重合挙動に与える影響の検討

  堀次恒介, 山本毅, 玉置信之, 青木健一  高分子学会予稿集(CD-ROM)  62-  (1)  ROMBUNNO.3PC119  2013/05/14  [Not refereed][Not invited]
  
• 2成分系ジアセチレンゲル化剤のゲル化特性と光重合挙動

  堀次恒介, 原田真衣, 玉置信之, 青木健一  日本化学会講演予稿集  93rd-  (3)  1039  2013/03/08  [Not refereed][Not invited]
  
• 光異性化反応で分子機能を動的に制御する―分子のキラリティー,液晶の分子配列,モータータンパク質の運動を例に―

  玉置信之  フォトポリマー懇話会講演会  195th-  9  -10  2012/12/06  [Not refereed][Not invited]
  
• アゾベンゼンの光異性化による微小管重合‐脱重合ダイナミクスの光制御

  深港豪, 亀井敬, 齊藤健太, 永井健治, 玉置信之  光化学討論会講演要旨集  2012-  212  2012/09/07  [Not refereed][Not invited]
  
• フォトクロミズムによるpKa変化を利用した水溶性蛍光スイッチング分子

  深港豪, 玉置信之  光化学討論会講演要旨集  2012-  122  2012/09/07  [Not refereed][Not invited]
  
• ジアセチレン系ゲル化剤のアルキル鎖が光重合性に及ぼす偶奇効果の発現メカニズム

  青木健一, 堀次恒介, 原田真衣, 玉置信之  高分子学会予稿集(CD-ROM)  61-  (2)  ROMBUNNO.3Q02  2012/09/05  [Not refereed][Not invited]
  
• 光デバイスの未踏領域 分子機械―キネシン/微小管系―の運動機能の動的光制御

  玉置信之, 亀井敬  光アライアンス  23-  (6)  16  -18  2012/06/01  [Not refereed][Not invited]
  
• 分子機械-キネシン/微小管系-の運動機能の動的光制御 (特集 光デバイスの未踏領域)

  玉置 信之, 亀井 敬  光アライアンス  23-  (6)  16  -18  2012/06  [Not refereed][Not invited]
  
• Laboratory of Smart Molecules, Research Institute for Electronic Science, Hokkaido University

  TAMAOKI Nobuyuki  液晶 : 日本液晶学会誌 = Ekisho  16-  (2)  154  -154  2012/04/25  [Not refereed][Not invited]
  
• 光スイッチング機能を有する微小管重合阻害剤:重合阻害に及ぼす置換基依存性

  深港豪, 亀井敬, 玉置信之  日本化学会講演予稿集  92nd-  (3)  894  2012/03/09  [Not refereed][Not invited]
  
• 新規なフォトクロミックヌクレオチドアナログによる生体ナノモーターの駆動と運動の光制御

  亀井敬, 深港豪, 玉置信之  日本化学会講演予稿集  92nd-  (3)  894  2012/03/09  [Not refereed][Not invited]
  
• 面性不斉型アゾベンゼン誘導体を添加したコレステリック液晶上におけるガラス薄片の光駆動一方向連続回転

  赤坂岳人, THOMAS Reji, 玉置信之  日本化学会講演予稿集  92nd-  (3)  890  2012/03/09  [Not refereed][Not invited]
  
• アントラセン基を有するジチアゾリルエテン誘導体のフォトクロミズムと蛍光特性

  大原裕樹, 森本正和, 深港豪, 玉置信之, 入江正浩  光化学討論会講演要旨集  2011-  124  2011/09/01  [Not refereed][Not invited]
  
• アゾベンゼンのフォトクロミズムによる微小管タンパク質の重合‐脱重合挙動の制御

  深港豪, 亀井敬, 玉置信之  光化学討論会講演要旨集  2011-  18  2011/09/01  [Not refereed][Not invited]
  
• 光応答性エネルギー供与分子による生体ナノモーターの駆動と運動の光制御

  亀井敬, 深港豪, 玉置信之  ナノ学会大会講演予稿集  9th-  195  2011/06/02  [Not refereed][Not invited]
  
• 光ラセミ化を利用した単一分子蛍光スイッチング

  深港豪, 玉置信之, 入江正浩  日本化学会講演予稿集  91st-  (3)  854  2011/03/11  [Not refereed][Not invited]
  
• キネシン‐微小管系の運動の光変調

  深港豪, 亀井敬, 玉置信之  光化学討論会講演要旨集  2010-  350  2010/09/08  [Not refereed][Not invited]
  
• フルオレン残基を含む光学活性ハイパーブランチポリマーの合成と機能

  JUIN‐MENG Yu, JUIN‐MENG Yu, 坂本猛, 古海誓一, 玉置信之, CHEN Yun, 中野環  高分子学会予稿集(CD-ROM)  59-  (2 Disk1)  ROMBUNNO.2F02  2010/09/01  [Not refereed][Not invited]
  
• 人工分子機械の運動を見る

  深港豪, 玉置信之  化学  65-  (6)  72  -73  2010/06/01  [Not refereed][Not invited]
  
• 面不斉型光応答性キラル添加剤

  玉置信之  液晶  14-  (1)  32  -38  2010/01/25  [Not refereed][Not invited]
   

  面不斉を示す新しいキラル添加剤として,アゾベンゼンを主骨格に含む単環型またはビシクロ型大環状化合物を合成した,得られた化合物のラセミ体は,キラルカラムにより鏡像異性体に分割でき,市販のネマチック液晶に対して十分な相溶性を示した.単環型化合物は,十分大きなねじり力と光反応前後における大きなねじり力の変化を示し,光反応により,液晶の反射色を可視域の広い領域で変化させることができた.一方,ビシクロ型化合物は,光反応前後でねじりの向きの逆転が起こった.今回の面不斉光応答性キラル添加剤では光応答性部位が不斉を発現するための構成要素となっているため,大きなねじり力の変化やねじりの向きの逆転が起こったと考えられる.
• Planar Chiral Liquid-Crystal Additives with Photoresponsivity

  TAMAOKI Nobuyuki  Journal of the Japanese Liquid Crystal Society  14-  (1)  32  -38  2010/01/25  [Not refereed][Not invited]
   

  面不斉を示す新しいキラル添加剤として,アゾベンゼンを主骨格に含む単環型またはビシクロ型大環状化合物を合成した,得られた化合物のラセミ体は,キラルカラムにより鏡像異性体に分割でき,市販のネマチック液晶に対して十分な相溶性を示した.単環型化合物は,十分大きなねじり力と光反応前後における大きなねじり力の変化を示し,光反応により,液晶の反射色を可視域の広い領域で変化させることができた.一方,ビシクロ型化合物は,光反応前後でねじりの向きの逆転が起こった.今回の面不斉光応答性キラル添加剤では光応答性部位が不斉を発現するための構成要素となっているため,大きなねじり力の変化やねじりの向きの逆転が起こったと考えられる.
• 面不斉を有する新規なアゾベンゼノファンの合成と性質

  長沢順一, 吉田勝, BASHEER Methale Cheleveettil, 玉置信之  基礎有機化学討論会要旨集  20th-  405  2009/09/18  [Not refereed][Not invited]
  
• 大環状アゾベンゼンのシス‐トランス異性化の理論的考察

  則包恭央, 吉田勝, 玉置信之  光化学討論会講演要旨集  2009-  384  2009/09/16  [Not refereed][Not invited]
  
• 糖アルコールを骨格にもつ光応答性スメクチック液晶化合物

  秋山陽久, 田中明日香, 田中明日香, 田中明日香, 長沢順一, 吉田勝, 平松秀夫, 玉置信之  日本液晶学会討論会講演予稿集(CD-ROM)  2009-  ROMBUNNO.2B09  2009/09/07  [Not refereed][Not invited]
  
• 高分子水溶液中での光照射による球状散乱体の形成

  秋山陽久, 吉田勝, 玉置信之  高分子学会予稿集(CD-ROM)  58-  (2 Disk1)  ROMBUNNO.1L2-07  2009/09/01  [Not refereed][Not invited]
  
• 液晶性半導体を用いたフレキシブルトランジスターの作製と特性

  舟橋正浩, ZHANG Fapei, 玉置信之  高分子学会予稿集(CD-ROM)  58-  (1 Disk1)  2G06  2009/05/12  [Not refereed][Not invited]
  
• Crystalline-state [2+2] photodimerization and photopolymerization of fluorinated diphenylpolyenes

  園田与理子, 後藤みどり, 都築誠二, 秋山陽久, 玉置信之  日本化学会講演予稿集  89th-  (2)  790  2009/03/13  [Not refereed][Not invited]
  
• 新世代の光学素子 螺旋構造を持つ液晶性半導体

  舟橋正浩, 玉置信之  光技術コンタクト  47-  (2)  77  -82  2009/02/20  [Not refereed][Not invited]
  
• 螺旋構造を持つ液晶性半導体 (特集 新世代の光学素子)

  舟橋 正浩, 玉置 信之  光技術コンタクト  47-  (2)  77  -82  2009/02  [Not refereed][Not invited]
  
• Synthesis and Characterization of a New Planar Chiral Azobenzenophane

  Nagasawa Jun'ichi, Yoshida Masaru, Basheer Methale Cheleveettil, Tamaoki Nobuyuki  Abstracts of Symposium on Physical Organic Chemistry  2009-  (0)  283  -283  2009  [Not refereed][Not invited]
   

  Recently we reported that a planar chiral azobenzenophane compound has been employed in commercially available nematic liquid crystals to achieve phototunable reflection colors. The cyclization was achieved by the reduction of nitro groups but the yield was low (ca. 1%). To obtain a planar chiral analogue in higher yield and to examine the effect of the difference of spacer chains on the physical property, we have synthesized a new azobenzenophane compound (<B>1</B>) in the Williamson reaction at ca. 10% yield. The azobenzene moiety of compound <B>1</B> isomerizes on irradiation. Both E- and Z-isomers have planer chirality and the corresponding enantiomers were resolved by HPLC on a chiral column. Nine conformers for E-isomer and three conformers for Z-isomer are found by CONFLEX conformation search and subsequently optimization with quantum chemical calculations at the B3LYP/6-31G(d,p) level. E isomer of compound <B>1</B> shows more flexible structure than the compound reported. Absolute configuration was determined by comparison of time dependent density functional theory calculations of its circular dichroism (CD) spectra to experimental CD spectra.
• Photoresponsive Smectic Liquid Crystals with Sugar Alcohol Backbones

  Akiyama Haruhisa, Tanaka Asuka, Nagasawa Jun'ichi, Yoshida Masaru, Hiramatsu Hideo, Tamaoki Nobuyuki  Proceedings of Japanese Liquid Crystal Society Annual meeting  2009-  (0)  95  -95  2009  [Not refereed][Not invited]
   

  We simply tethered multiple mesogenic azobenzene units to sugar alcohols to obtain effective dopants for cholestric liquid crystals. The new dopants that featured linear sugar alcohol backbones exhibited increasingly stable smectic phases upon increasing the number of mesogenic groups in the molecule. Addition of these smectic liquid crystalline dopants to the glass-forming cholesteric liquid crystalline material induced increasingly larger pitch shifts upon increasing the number of intramolecular mesogenic groups in the dopant. Dopants prepared from stereoisomeric sugar alcohol backbones provided similar liquid crystalline phases and induced similar pitch shifts after their addition to the cholesteric liquid crystals.
• [0.0](3,3’)‐アゾベンゼノファンの異性化挙動

  則包恭央, 加藤隆二, 玉置信之  光化学討論会講演要旨集  2008-  26  2008/09/11  [Not refereed][Not invited]
  
• フッ素置換ジフェニルヘキサトリエンの結晶相[2+2]光重合

  園田与理子, 後藤みどり, 都築誠二, 秋山陽久, 玉置信之  光化学討論会講演要旨集  2008-  38  2008/09/11  [Not refereed][Not invited]
  
• ジフェニルヘキサトリエンカルボン酸の固体発光

  園田与理子, 玉置信之  光化学討論会講演要旨集  2008-  319  2008/09/11  [Not refereed][Not invited]
  
• アゾベンゼンを置換したオリゴペプチド誘導体からなる光応答性分子ゲル光異性化反応速度の効果

  松澤洋子, 玉置信之  高分子学会予稿集(CD-ROM)  57-  (2 Disk1)  3PA059  2008/09/09  [Not refereed][Not invited]
  
• 新規な有機電解質化合物をゲル化剤とする,水・有機溶媒およびイオン液体ゲルの調製とその諸物性

  吉田勝, 三沢善大, 玉置信之, 甲村長利, 松本一  繊維学会予稿集  63-  (1/2)  330  2008/06/18  [Not refereed][Not invited]
  
• 液晶性半導体を用いた溶液プロセスによる薄膜トランジスターの作製

  舟橋 正浩, 張 発培, 玉置 信之  Molecular electronics and bioelectronics  19-  (2)  115  -118  2008/05/30  [Not refereed][Not invited]
  
• アゾベンゼン部位をもつポリN‐イソプロピルアクリルアミドの光相転移

  秋山陽久, 玉置信之  高分子学会予稿集(CD-ROM)  57-  (1 Disk1)  1PF108  2008/05/08  [Not refereed][Not invited]
  
• アントラセンの光二量化により得られるポリマーのアモルファス‐結晶相転移を利用した微細パターンの形成

  木原秀元, 玉置信之, 本橋壮志, 松村一成  高分子学会予稿集(CD-ROM)  57-  (1 Disk1)  1PE109  2008/05/08  [Not refereed][Not invited]
  
• 液晶性半導体を用いた高分子基板上への薄膜トランジスターの作製と特性

  舟橋正浩, ZHANG Fapei, 玉置信之  高分子学会予稿集(CD-ROM)  57-  (1 Disk1)  2PE129  2008/05/08  [Not refereed][Not invited]
  
• 新規なアンモニウム型ポリマーの合成と機能性ゲル化剤としての応用

  吉田勝, 三澤善大, 玉置信之, 甲村長利, 松本一  高分子学会予稿集(CD-ROM)  57-  (1 Disk1)  3D09  2008/05/08  [Not refereed][Not invited]
  
• 液晶性半導体を用いた溶液プロセスによる薄膜トランジスターの作製

  舟橋正浩, ZHANG Fapei, 玉置信之  応用物理学関係連合講演会講演予稿集  55th-  (0)  132  2008/03/27  [Not refereed][Not invited]
  
• 液晶性フェニルターチオフェン誘導体を用いた溶液プロセスによる電界効果トランジスターの作製と評価

  舟橋正浩, ZHANG Fapei, 玉置信之  日本化学会講演予稿集  88th-  (1)  592  2008/03/12  [Not refereed][Not invited]
  
• フッ素置換ジフェニルヘキサトリエンの結晶構造と蛍光特性

  園田与理子, 後藤みどり, 都築誠二, 玉置信之  日本化学会講演予稿集  88th-  (2)  940  2008/03/12  [Not refereed][Not invited]
  
• コレステリック液晶の情報材料への応用 (特集 構造色とその応用)

  秋山 陽久, 玉置 信之  O plus E  30-  (2)  169  -173  2008/02  [Not refereed][Not invited]
  
• 構造色とその応用 コレステリック液晶の情報材料への応用

  秋山陽久, 玉置信之  O plus E  (339)  169  -173  2008/01/25  [Not refereed][Not invited]
  
• 有機電解質オリゴマーのアニオン交換反応による相溶性の制御およびオルガノゲル・イオンゲルの作成

  甲村長利, 吉田勝, 松本一, 三澤善大, 玉置信之, 川波肇  高分子ゲル研究討論会講演要旨集  19th-  33  -34  2008/01/09  [Not refereed][Not invited]
  
• 有機電解質を基本構造とするゲル化剤の合成と多様な機能

  吉田勝, 三澤善大, 玉置信之, 甲村長利, 松本一  高分子ゲル研究討論会講演要旨集  19th-  111  -112  2008/01/09  [Not refereed][Not invited]
  
• ソフト・オプトエレクトロニクス材料(VI)―アゾ駆動デバイスのボトムアップアプローチの新展開―面不斉アゾベンゼンの合成と光駆動分子機械への展開

  玉置信之  ソフト・オプトエレクトロニクス材料6-アゾ駆動デバイスのボトムアップアプローチの新展開 理研シンポジウム/第169回JOEM講演要旨集 平成20年  19  -24  2008  [Not refereed][Not invited]
  
• キラルフォトクロミック化合物から生成するキラルラジカル対

  藤田華奈, 波多野さや佳, 和田百代, 玉置信之, 内藤昌信, 河合壮, 阿部二朗  分子科学討論会講演プログラム&要旨(Web)  2nd-  ROMBUNNO.1P041 (WEB ONLY)  2008  [Not refereed][Not invited]
  
• アゾベンゼンを置換したオリゴペプチド誘導体の光による自己組織化制御

  松澤洋子, 玉置信之  ポリマー材料フォーラム講演予稿集  16th-  78  2007/11/14  [Not refereed][Not invited]
  
• クロミック材料を用いたディスプレイ コレステリック液晶のサーモクロミズムとフォトクロミズムを利用する記録表示

  玉置信之  光技術コンタクト  45-  (10)  533  -538  2007/10/20  [Not refereed][Not invited]
  
• 水,有機溶媒,イオン液体に適用できるゲル化剤 新しい有機電解質オリゴマーの簡便な合成法と多様な機能

  吉田勝, 甲村長利, 三澤善大, 玉置信之, 太田敏隆, 松本一, 川波肇, サイ カザウィ, 南信次  産総研TODAY  7-  (10)  26  2007/10/01  [Not refereed][Not invited]
  
• コレステリック液晶のサーモクロミズムとフォトクロミズムを利用する記録表示 (特集 クロミック材料を用いたディスプレイ)

  玉置 信之  光技術コンタクト  45-  (10)  533  -538  2007/10  [Not refereed][Not invited]
  
• スピロペリミジン系化合物のフォトクロミック特性に及ぼす媒体の効果

  則包恭央, DAVIS Riju, 西村賢宣, 新井達郎, 玉置信之  光化学討論会講演要旨集  2007-  341  2007/09/21  [Not refereed][Not invited]
  
• フッ素置換ジフェニルヘキサトリエンの結晶構造と固体蛍光

  園田与理子, 後藤みどり, 都築誠二, 玉置信之  光化学討論会講演要旨集  2007-  72  2007/09/21  [Not refereed][Not invited]
  
• [0.0](3,3′)‐アゾベンゼノファンの光応答性に及ぼす環ひずみの効果

  則包恭央, 玉置信之  光化学討論会講演要旨集  2007-  451  2007/09/21  [Not refereed][Not invited]
  
• ドナーアクセプター置換ジフェニルポリエンの吸収スペクトルの理論計算

  園田与理子, 都築誠二, 玉置信之  光化学討論会講演要旨集  2007-  155  2007/09/21  [Not refereed][Not invited]
  
• 新規有機電解質オリゴマーを用いたオルガノゲルの電気二重層キャパシタへの応用

  松本一, 甲村長利, 吉田勝, 川波肇, 玉置信之, 辰巳国昭  電気化学秋季大会講演要旨集  2007-  289  2007/09/19  [Not refereed][Not invited]
  
• 共役系オリゴマー液晶―アルキル置換オリゴフェニレンエチニレン7量体の液晶性―

  谷田部哲夫, 川西祐司, 玉置信之  高分子学会予稿集(CD-ROM)  56-  (2 Disk1)  3J01  2007/09/04  [Not refereed][Not invited]
  
• 有機電解質オリゴマーをゲル化剤とするヒドロゲルの調製と高速構造復帰特性

  吉田勝, 甲村長利, 三澤善大, 玉置信之, 松本一  高分子学会予稿集(CD-ROM)  56-  (2 Disk1)  2PF084  2007/09/04  [Not refereed][Not invited]
  
• アゾベンゼンの光異性化反応による分子内運動の制御

  玉置信之, 和田百代, 岡芳美, MATHEWS Manoj  高分子学会予稿集(CD-ROM)  56-  (2 Disk1)  1O05  2007/09/04  [Not refereed][Not invited]
  
• Photochemically driven molecular machine

  玉置 信之  Function & materials  27-  (8)  50  -56  2007/08  [Not refereed][Not invited]
  
• 有機フォトクロミズムの新機軸 光駆動型分子機械

  玉置信之  機能材料  27-  (8)  50  -56  2007/07/05  [Not refereed][Not invited]
  
• ケイ皮酸の光化学反応を利用した二量体液晶の合成とその液晶構造の解析

  木原秀元, 玉置信之  高分子学会予稿集(CD-ROM)  56-  (1 Disk1)  3E01  2007/05/10  [Not refereed][Not invited]
  
• 新規電解質有機オリゴマーを用いたオルガノゲル・イオンゲルの作成およびその応用

  甲村長利, 吉田勝, 玉置信之, 松本一, 川波肇  高分子学会予稿集(CD-ROM)  56-  (1 Disk1)  2PD130  2007/05/10  [Not refereed][Not invited]
  
• 分子両末端にアントラセンを有する液晶モノマーの合成と光重合による主鎖型液晶ポリマーへの転化

  本橋壮志, 松村一成, 木原秀元, 玉置信之  高分子学会予稿集(CD-ROM)  56-  (1 Disk1)  2PF114  2007/05/10  [Not refereed][Not invited]
  
• 電解質構造を持った新しい有機材料の機能性:ゲル化能及び単層カーボンナノチューブ分散能

  吉田勝, 甲村長利, 三澤善大, 玉置信之, 南信次, KAZAOUI Said, 松本一, 川波肇  高分子学会予稿集(CD-ROM)  56-  (1 Disk1)  1M07  2007/05/10  [Not refereed][Not invited]
  
• ハイドロゲル化剤として機能する新規電解質化合物の共重合法による合成

  三澤善大, 吉田勝, 甲村長利, 玉置信之, 松本一  高分子学会予稿集(CD-ROM)  56-  (1 Disk1)  2PC129  2007/05/10  [Not refereed][Not invited]
  
• オリゴチオフェン誘導体のコレステリック相での分子凝集構造のキャリア移動度への影響

  舟橋正浩, 玉置信之  応用物理学関係連合講演会講演予稿集  54th-  (3)  1344  2007/03/27  [Not refereed][Not invited]
  
• 液晶性半導体を用いた溶液プロセスによる薄膜トランジスター

  舟橋正浩, ZHANG Fapei, 玉置信之  日本化学会講演予稿集  87th-  (1)  291  2007/03/12  [Not refereed][Not invited]
  
• スピロペリミジン系フォトクロミック化合物の反応機構

  則包恭央, DAVIS Riju, 西村賢宣, 新井達郎, 玉置信之  日本化学会講演予稿集  87th-  (2)  1610  2007/03/12  [Not refereed][Not invited]
  
• 1,4‐シクロヘキサンジオールから誘導された大環状ジアセチレン化合物のゲル化と光重合

  長沢順一, 玉置信之  日本化学会講演予稿集  87th-  (1)  725  2007/03/12  [Not refereed][Not invited]
  
• バナナ型共役分子trans,cis,transジフェニルヘキサトリエン環置換体の結晶構造

  園田与理子, 都築誠二, 玉置信之, 後藤みどり  日本化学会講演予稿集  87th-  (2)  1422  2007/03/12  [Not refereed][Not invited]
  
• 電解質ゲル化剤により調製されるヒドロゲルのレオロジー特性

  吉田勝, 三澤善大, 玉置信之, 甲村長利  レオロジー討論会講演要旨集  55th-  282  -283  2007  [Not refereed][Not invited]
  
• 1P314 Visible-light photoresponsivity of synthetic DNA conjugated with 4-(dimethylamino)azobenzene as a side chain unit(Bioengineering,Poster Presentations)

  Kamei Takashi, Akiyama Haruhisa, Kudo Masabumi, Wada Momoyo, Nagasawa Jun'ichi, Funahashi Masahiro, Tamaoki Nobuyuki, Uyeda Taro Q  Seibutsu Butsuri  47-  (0)  S102  2007  [Not refereed][Not invited]
  
• p‐ニトロ‐p′‐アルコキシ置換ジフェニルヘキサトリエンの結晶構造と固体吸収/発光スペクトルに対する鎖長効果

  園田与理子, 後藤みどり, 都筑誠二, 玉置信之  基礎有機化学連合討論会予稿集  18th-  168  -169  2006/10/07  [Not refereed][Not invited]
  
• ドナーアクセプター置換ジフェニルヘキサトリエンの結晶構造と固体発光

  園田与理子, 後藤みどり, 都築誠二, 玉置信之  光化学討論会講演要旨集  2006-  464  2006/09/09  [Not refereed][Not invited]
  
• スピロペリミジン系化合物のフォトクロミズム

  則包恭央, DAVIS Riju, 玉置信之  光化学討論会講演要旨集  2006-  202  2006/09/09  [Not refereed][Not invited]
  
• 水素結合性二量体型液晶から水素結合性主鎖型高分子液晶への光化学的転化

  木原秀元, 玉置信之  高分子学会予稿集(CD-ROM)  55-  (2 Disk1)  2PF002  2006/09/05  [Not refereed][Not invited]
  
• 末端もしくは中央に1つのアゾベンゼン部位をもつポリイソプロピルアクリルアミドの合成と光相転移

  秋山陽久, 玉置信之  高分子学会予稿集(CD-ROM)  55-  (2 Disk1)  1N13  2006/09/05  [Not refereed][Not invited]
  
• 室温でコレステリック相を示す液晶性半導体の電荷輸送と発光特性

  舟橋正浩, 玉置信之  日本液晶学会討論会講演予稿集(CD-ROM)  2006-  3C02  -105  2006/09/01  [Not refereed][Not invited]
   

  Synthesis and carrier transport and luminescence of cholesteric semiconductors exhibiting cholesteric phase around r.t. was investigated. Dimeric oligothiophene derivatives with binaphthyl spacer exhibited glassy cholesteric phase around r.t. Positive and negative carrier mobility at r.t. was on the order of 10-5 cm2/Vs. Circularly polarized luminescence was observed when reflection band overlaped with fluorescence spectrum.
• フェニルターチオフェン誘導体の室温での高電子移動度

  舟橋正浩, 張発培, 玉置信之  日本液晶学会討論会講演予稿集(CD-ROM)  2006-  3C07  -110  2006/09/01  [Not refereed][Not invited]
   

  Dialkylterthiophene derivatives exhibit highly ordered smectic phases around room temperature and their thin film fabrication is possible with solution process. Their carrier mobilities were determined with time-of-flight technique. Hole mobility was 0.05 cm2/Vs and electron mobility was 0.2 cm2/Vs at room temperature respectively. Because of their good thin film formation properties, they can be applied thin film transistors.
• 和周波発生(SFG)分光法を用いたpNIPAAm表面・界面の研究

  宮前孝行, 秋山陽久, 吉田勝, 玉置信之  分子構造総合討論会講演要旨集(CD-ROM)  2006-  4P128  2006/08/24  [Not refereed][Not invited]
  
• 環状アゾベンゼンを配位子とするAg(I)二核錯体の構造と機能

  岡芳美, 玉置信之  分子構造総合討論会講演要旨集(CD-ROM)  2006-  4C12  2006/08/24  [Not refereed][Not invited]
  
• Polymerization of Self-Organized Diacetylene Derivatives

  玉置信之  高分子  55-  (8)  611  -615  2006/08/01  [Not refereed][Not invited]
  
• Polymerization of Self-Organized Diacetylene Derivatives

  TAMAOKI Nobuyuki  Kobunshi  55-  (8)  611  -615  2006/08/01  [Not refereed][Not invited]
  
• DNAナノスイッチの創製

  亀井敬, 工藤成史, 秋山陽久, 和田百代, 長沢順一, 玉置信之, 上田太郎  ナノ学会大会講演予稿集  4th-  182  2006/05/19  [Not refereed][Not invited]
  
• 和周波発生(SFG)分光法を用いたpoly(NIPAAm)表面構造の研究

  宮前孝行, 秋山陽久, 吉田勝, 玉置信之  高分子学会予稿集(CD-ROM)  55-  (1 Disk1)  3PB064  2006/05/10  [Not refereed][Not invited]
  
• オリゴチオフェン誘導体のキラルネマティック相での電子伝導

  舟橋正浩, 玉置信之  応用物理学関係連合講演会講演予稿集  53rd-  (3)  1362  2006/03/22  [Not refereed][Not invited]
  
• コレステリック構造色の光,熱制御とフルカラー記録・表示材料への応用

  玉置信之  応用物理学関係連合講演会講演予稿集  53rd-  (0)  89  2006/03/22  [Not refereed][Not invited]
  
• Photodimerization of a Cinnamic Acid Moiety Attached to the End of Liquid Crystals

  木原秀元, 玉置信之  日本化学会講演予稿集  86th-  (2)  1541  2006/03/13  [Not refereed][Not invited]
  
• Synthesis of oligothiophenes using Pd catalyzed C-H homocoupling and cross coupling.

  関口広樹, 高橋正史, 小林信彦, 森敦紀, 舟橋正浩, 玉置信之  日本化学会講演予稿集  86th-  (2)  958  2006/03/13  [Not refereed][Not invited]
  
• Organic semiconductor with helical structure - Electronic conduction in the cholesteric phase of a phenylquaterthiophene derivatives

  舟橋正浩, 玉置信之  日本化学会講演予稿集  86th-  (1)  559  2006/03/13  [Not refereed][Not invited]
  
• Crystal Structure and Emission Properties of Donor-Acceptor-Substituted 1,6-Diphenyl-1,3,5-Hexatrienes

  園田与理子, 後藤みどり, 玉置信之  日本化学会講演予稿集  86th-  (2)  1389  2006/03/13  [Not refereed][Not invited]
  
• コレステリック液晶の色調制御と可逆的固定

  玉置信之  印刷・情報記録・表示研究会講座講演要旨集  2005-  1  -4  2006/02/16  [Not refereed][Not invited]
  
• High electron mobility of phenylterthiophene derivatives around room temperature

  FUNAHASHI MASAHIRO, TAMAOKI NOBUYUKI  Proceedings of Japanese Liquid Crystal Society Annual meeting  2006-  (0)  110  -110  2006  [Not refereed][Not invited]
   

  Dialkylterthiophene derivatives exhibit highly ordered smectic phases around room temperature and their thin film fabrication is possible with solution process. Their carrier mobilities were determined with time-of-flight technique. Hole mobility was 0.05 cm2/Vs and electron mobility was 0.2 cm2/Vs at room temperature respectively. Because of their good thin film formation properties, they can be applied thin film transistors.
• Carrier transport and luminescence of glassy cholesteric semiconductors

  FUNAHASHI MASAHIRO, TAMAOKI NOBUYUKI  Proceedings of Japanese Liquid Crystal Society Annual meeting  2006-  (0)  105  -105  2006  [Not refereed][Not invited]
   

  Synthesis and carrier transport and luminescence of cholesteric semiconductors exhibiting cholesteric phase around r.t. was investigated. Dimeric oligothiophene derivatives with binaphthyl spacer exhibited glassy cholesteric phase around r.t. Positive and negative carrier mobility at r.t. was on the order of 10-5 cm2/Vs. Circularly polarized luminescence was observed when reflection band overlaped with fluorescence spectrum.
• Solid-state absorption/fluorescence spectra and crystal structure of a series of p-nitro-p'-alkoxy-substituted diphenylhexatrienes.

  Sonoda Yoriko, Goto Midori, Tsuzuki Seiji, Tamaoki Nobuyuki  Abstracts of Symposium on Physical Organic Chemistry  18-  (0)  92  -92  2006  [Not refereed][Not invited]
   

  鎖長の異なる一連のニトロアルコキシ置換ジフェニルヘキサトリエンの結晶状態での吸収/蛍光発光特性を研究した。吸収/発光極大波長はアルコキシ鎖長に大きく依存した。一方、各化合物の発光量子収率、蛍光寿命などは鎖長に依存せず全てモノマー由来の発光に特徴的であった。単結晶Ｘ線構造解析結果と合わせ、固体吸収/発光特性と結晶構造との相関を議論する。また量子化学計算結果と比較した結果についても報告する。
• Material Report Review 光による高分子表面の親水疎水性制御とその応用

  秋山 陽久, 玉置 信之  機能材料  26-  (1)  28  -34  2006/01  [Not refereed][Not invited]
  
• Hydrophilicity and hydrophobicity control of the polymer surface by the light and the application.

  秋山陽久, 玉置信之  機能材料  26-  (1)  28  -34  2005/12/05  [Not refereed][Not invited]
  
• ドナーアクセプター置換ジフェニルヘキサトリエンの固体発光

  園田与理子, 後藤みどり, 玉置信之  光化学討論会講演要旨集  2005-  235  2005/09/11  [Not refereed][Not invited]
  
• 新規な電解質ゲル化剤(Ionic gelator)のone‐pot合成とカーボンナノチューブ可溶化剤としての応用

  吉田勝, KAZAOUI Said, 甲村長利, 玉置信之, 南信次  高分子学会予稿集(CD-ROM)  54-  (2 Disk1)  3T03  2005/09/05  [Not refereed][Not invited]
  
• 螺旋構造を有する液晶性半導体の合成と物性

  舟橋正浩, 玉置信之  日本液晶学会討論会講演予稿集  2005-  1  -2  2005/09/05  [Not refereed][Not invited]
  
• 1A02 Synthesis and characterization of oligithiophene liquid crystalline semiconductors with helical structure

  Funahashi Masahiro, Tamaoki Nobuyuki  日本液晶学会討論会講演予稿集  (2005)  1  -2  2005/09/05  [Not refereed][Not invited]
  
• 和周波発生(SFG)分光法による感温性高分子poly‐NIPAAm表面の研究

  宮前孝行, 吉田勝, 秋山陽久, 玉置信之  分子構造総合討論会講演要旨集(CD-ROM)  2005-  1P176  2005/09/01  [Not refereed][Not invited]
  
• アゾベンゼン骨格を有する光応答性有機ゲル化剤の開発と有機ゲルの光挙動

  甲村長利, 工藤成史, 玉置信之  構造有機化学討論会講演予稿集  35th-  260  -261  2005/08/29  [Not refereed][Not invited]
  
• Gelation and photopolymerization of macrocyclic diacetylene cholesteryl esters

  工藤成史, 玉置信之  日本化学会講演予稿集  85th-  (1)  226  2005/03/11  [Not refereed][Not invited]
  
• Synthesis and carrier transport in liquid crystalline semiconductors with helical structure

  FUNAHASHI MASAHIRO, TAMAOKI NOBUYUKI  Proceedings of Japanese Liquid Crystal Society Annual meeting  2005-  (0)  3  -3  2005  [Not refereed][Not invited]
   

  Synthesis of oligothiophene derivatives exhibiting chiral nematic phase will be reported, as well as their carrier transport properties.
• コレステリルエステル型ジメソゲンによる分子組織体形成と光機能材料への応用

  玉置信之  ポリマー材料フォーラム講演予稿集  13th-  102  -103  2004/10/28  [Not refereed][Not invited]
  
• 光応答性蝶番化合物

  玉置信之, 則包恭央  光化学討論会講演要旨集  2004-  391  2004/10/25  [Not refereed][Not invited]
  
• ジアセチレン系有機ゲルの光重合性におけるアルキレン炭素の偶奇効果

  青木健一, 玉置信之  高分子学会予稿集(CD-ROM)  53-  (2 Disk1)  2L05  2004/09/01  [Not refereed][Not invited]
  
• Efect of magenetic field on gelation of diacetylene cholesteryl ester derivatives

  長沢順一, 工藤成史, 玉置信之  日本化学会講演予稿集  84th-  (1)  282  2004/03/11  [Not refereed][Not invited]
  
• Gelation and Photoisomerization of Dichoresterylester with an Azobenzene Unit

  甲村長利, 工藤成史, 玉置信之  日本化学会講演予稿集  84th-  (1)  283  2004/03/11  [Not refereed][Not invited]
  
• Gelation and Photoisomerization of Dichoresterylester Derivatives with an Azobenzene

  甲村長利, 玉置信之  日本化学会講演予稿集  84th-  (2)  970  2004/03/11  [Not refereed][Not invited]
  
• Charge-Transfer Complexes Composed of Ion-Pairs Formed by Two Acceptor Molecules and Various Donor Molecules

  藤縄祐, 玉置信之  日本化学会講演予稿集  84th-  (2)  1289  2004/03/11  [Not refereed][Not invited]
  
• 中分子コレステリック液晶によるフレキシブル表示記録媒体の開発

  高橋敦, 小泉真一, 北原清志, 玉置信之  日本印刷学会研究発表会講演予稿集  112th-  126  -127  2004  [Not refereed][Not invited]
  
• スピロピランLangmuir膜の光応答性のヒステリシス

  中沢隆浩, AJAY MALLIA V, 阿澄玲子, 酒井秀樹, 阿部正彦, 玉置信之, 松本睦良  光化学討論会講演要旨集  2003-  56  2003/11/15  [Not refereed][Not invited]
  
• 環状および非環状アゾベンゼン2量体のシス‐トランス異性化反応

  則包恭央, 北本虎吾郎, 玉置信之  光化学討論会講演要旨集  2003-  417  2003/11/15  [Not refereed][Not invited]
  
• 光重合による高分子添加剤の作成とコレステリック液晶のピッチ制御

  秋山陽久, 玉置信之  日本液晶学会討論会講演予稿集  2003-  375  -376  2003/10/14  [Not refereed][Not invited]
  
• 特集号「モレキュラーキャラクタリゼーション」の発行にあたって

  右手 浩一, 安藤 慎治, 玉置 信之  高分子論文集  60-  (6)  巻頭言  2003/06/25  [Not refereed][Not invited]
  
• Relationship of the chemical structure on both gelation and polymerization of diacetylene cholesteryl ester derivatives

  長沢順一, 工藤成史, 玉置信之  日本化学会講演予稿集  83rd-  (1)  379  2003/03/03  [Not refereed][Not invited]
  
• Analytical study on structure and photopolymerization of organogels formed by the aggregation of diacetylene dicholesteryl ester derivatives

  工藤成史, 長沢順一, 玉置信之  日本化学会講演予稿集  83rd-  (1)  379  2003/03/03  [Not refereed][Not invited]
  
• PB09 Potopolymerization of Photoresponsive Additives and Pitch Control of Glass Forming Cholesteric Liquid Crystals

  Akiyama Haruhisa, Tamaoki Nobuyuki  Proceedings of Japanese Liquid Crystal Society Annual meeting  2003-  (0)  375  -376  2003  [Not refereed][Not invited]
   

  Glass forming cholesteric liquid crystals (docosa-10, 12-diynedioic acid dicholesteryl ester) including a potoreactive polymer produced the photorewitable full-color image storage. The potoreactive additives were prepared by polymerization of 12- [4- (4-dodecylphenylazo) phenoxy]dodecyl-acrylate in the liquid crystals. Weight average molecular weight of the polymeric materials was determined to be c. a. 7000 by gel permeation chromatography. The liquid crystal cell containing the azobenzene additives both before and after polymerization showed shifts of the cholesteric pitch in response to photo-irradiation depending on the isomerization ratio of azobenzene. The color image written in polymerized media maintained after heating at 50℃ for 12h, while the image written in the media without polymerization immediately disappeared on the heating at 50℃.
• 特集号「高分子系のナノ構造と物性・機能」の発行にあたって

  玉置 信之  高分子論文集  59-  (12)  巻頭言  2002/12/25  [Not refereed][Not invited]
  
• アゾベンゼノファンの構造と光および熱異性化反応

  則包恭央, 北本虎吾郎, 玉置信之  基礎有機化学連合討論会予稿集  16th-  74  -75  2002/10/03  [Not refereed][Not invited]
  
• 2′‐ヒドロキシカルコンのシス‐トランス異性化反応および分子内水素原子移動に関する理論計算

  則包恭央, 中山尚史, 玉置信之, 新井達郎, 長嶋雲兵  光化学討論会講演要旨集  2002-  385  2002/09/04  [Not refereed][Not invited]
  
• 大環状アゾベンゼン2量体のシス‐トランス異性化反応における環構造の影響

  則包恭央, 北本虎吾郎, 玉置信之  光化学討論会講演要旨集  2002-  191  2002/09/04  [Not refereed][Not invited]
  
• 新イメージング材料 9 フォトクロミック材料

  秋山陽久, 玉置信之  日本印刷学会誌  39-  (4)  267  -271  2002/07/31  [Not refereed][Not invited]
  
• New Imaging Materials : 9. Photochromic Materials

  AKIYAMA Haruhisa, TAMAOKI Nobuyuki  Bulletin of the Technical Association of Graphic Arts of Japan  39-  (4)  267  -271  2002/07/31  [Not refereed][Not invited]
   

  Photochromic materials are promising candidates for photosensitive parts in photoimaging and photorecording materials. However, the monitoring light for detection of photochromic color change can lead to degradation of the chromophors at photo-writing parts because of the photochemical back reaction. There have been several methods for new mode of photoimaging and photorecording system by using fluorescence property, photoreorientation, mass transportation, liquid crystal alignment or phase control and cholesteric liquid crystal pitch control of photochromic materials. They are useful to keep the writing information during reading process. This paper describes these methods briefly.
• Ion Pairs Formed by Two Acceptors of Anthraquinone and Methyl Viologen. (1).

  玉置信之, 木戸脇匡俊  日本化学会講演予稿集  81st-  (2)  771  2002/03/11  [Not refereed][Not invited]
  
• Structural Effect of Dopants on Helical Pitch of a Medium-molecular-weight Cholesteric Liquid Crystal.

  木戸脇匡俊, 和田百代, 守山雅也, 玉置信之  日本化学会講演予稿集  81st-  (1)  595  2002/03/11  [Not refereed][Not invited]
  
• Ion Pairs Formed by Two Acceptors of Anthraquinone and Methyl Viologen. (2).

  木戸脇匡俊, 玉置信之  日本化学会講演予稿集  81st-  (2)  772  2002/03/11  [Not refereed][Not invited]
  
• Structure and cis-trans Isomerization of meta-Substituted Azobenzenophanes.

  則包恭央, 北本虎吾郎, 玉置信之  日本化学会講演予稿集  81st-  (2)  1468  2002/03/11  [Not refereed][Not invited]
  
• Gelation of diacetylene dicholesteryl ester derivatives and dependence of polymerization on alkylene chain length.

  工藤成史, 長沢順一, 玉置信之  日本化学会講演予稿集  81st-  (1)  427  2002/03/11  [Not refereed][Not invited]
  
• Process of the reflection band change in photoresponsible cholesteric liquid crystal.

  長沢順一, 玉置信之  日本化学会講演予稿集  81st-  (1)  560  2002/03/11  [Not refereed][Not invited]
  
• Structure, Photo- and Thermal Isomerization of Azobenzenophanes

  Norikane Yasuo, Kitamoto Kogorou, Tamaoki Nobuyuki  Abstracts of Symposium on Physical Organic Chemistry  16-  (0)  149  -149  2002  [Not refereed][Not invited]
   

  In order to control the optical, magnetic or host-guest properties of molecules, the geometrical change in trans-cis isomerization of azobenzenes have been used to switch the properties. It has been known that the thermal and photochemical isomerization of azobenzene are affected by the steric hindrance such as cyclic structure or free volume. In azobenzenophanes, where two azobenzenes are linked cyclically by relatively short chains, thermal and photochemical isomerization are also influenced by the steric distortion. However, previous studies have been discussed the behaviour of molecules whose structure is not apparent. In this study, we synthesized the azobenzenophanes in which two, three and four azobenzenes are connected by methylene linkers at the mata position. X-ray crystal structure analyses revealed the all isomers of azobenzene dimer. In the trans,cis isomer, the cis-azobenzene unit was deformed due to the ring strain. The trans,trans isomer was slightly distorted, while the cis,cis isomer was not deformed. The relative stability of cis,cis and trans,cis isomers was deducible from the X-ray crystal structures. In azobenzene trimer and tetramer, a solvent molecule was incorporated into the molecular cavity in the solid state. Upon exposure to light, all molecules exhibited cis-trans isomerization.
• コレステリック液晶のガラス状態と書き換えカラー記録への応用

  玉置 信之  形の科学会誌 = Bulletin of the Society for Science on Form  16-  (2)  151  -152  2001/11/01  [Not refereed][Not invited]
  
• Solid films with iridescent reflection formed by self-assembly of liquid crystalline molecules.

  守山雅也, 玉置信之  応用物理  70-  (9)  1078  -1081  2001/09/10  [Not refereed][Not invited]
  
• コレステリック液晶性中分子を用いたカラー記録

  玉置信之  日本化学会講演予稿集  80th-  134  2001/09/07  [Not refereed][Not invited]
  
• Process analysis of the reflection band change in photoresponsible cholesteric liquid crystal.

  長沢順一, LEE S A, 玉置信之  光化学討論会講演要旨集  2001-  366  2001/09/03  [Not refereed][Not invited]
  
• Photoisomerization Behavior of meta-Substituted Azobenzenophane.

  則包恭央, 北本虎吾郎, 玉置信之  光化学討論会講演要旨集  2001-  283  2001/09/03  [Not refereed][Not invited]
  
• 最近の展望 液晶分子の自己組織化現象を利用した固体反射膜の作成

  守山 雅也, 玉置 信之  応用物理  70-  (9)  1078  -1081  2001/09  [Not refereed][Not invited]
  
• スピンコート下におけるジコレステリルエステルの自己組織化とキラル固体膜形成

  玉置信之, 守山雅也  高分子学会予稿集  50-  (8)  1560  -1561  2001/08/28  [Not refereed][Not invited]
  
• 光で下限臨界温度が変化するポリアクリルアミドの合成

  秋山陽久, 玉置信之  高分子学会予稿集  50-  (4)  703  2001/05/07  [Not refereed][Not invited]
  
• フォトンモードでのフルカラー書き換え記録を可能にする液晶材料

  玉置信之  AIST Today  1-  (3)  12  -15  2001/05  [Not refereed][Not invited]
  
• リライタブル記録材料

  高橋敦, 玉置信之  色材協会誌  74-  (4)  190  -195  2001/04/20  [Not refereed][Not invited]
  
• Rewritable Recording Materials

  TAKAHASHI Atsushi, TAMAOKI Nobuyuki  Journal of the Japan Society of Colour Material  74-  (4)  190  -195  2001/04/20  [Not refereed][Not invited]
  
• Gas phase cation-pi complexation of cyclic and acyclic oligo[(dimethylsilylene)phenylene]s: Electrospray mass spctrometry analysis and theoretical investigation.

  M Yoshida, S Tsuzuki, N Tamaoki  ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY  221-  U110  -U110  2001/04  [Not refereed][Not invited]
  
• Structural Analysis of Monolayers Generated from Phthalocyanine Derivatives Having Disulfide Moieties.

  長沢順一, 秋山陽久, 玉田薫, 玉置信之  日本化学会講演予稿集  79th-  (1)  589  2001/03/15  [Not refereed][Not invited]
  
• Synthesis, structure and cation-.PI. complexation behavior of tetrasila[1.1.1.1]m,p,m,p-cyclophane.

  吉田勝, 後藤みどり, 玉置信之  日本化学会講演予稿集  79th-  (1)  23  2001/03/15  [Not refereed][Not invited]
  
• 光と温度に応答する新しい分子組織体の基礎と応用

  玉置信之  日本化学会講演予稿集  79th-  (2)  657  2001/03/15  [Not refereed][Not invited]
  
• Effects of substituent chain length of photoreactive achiral additives on cholesteric pitch.

  守山雅也, 玉置信之  日本化学会講演予稿集  79th-  (1)  586  2001/03/15  [Not refereed][Not invited]
  
• Fixation of reflected color of liquid crystals formed by hydrogen bonding.

  高橋敦, 玉置信之, 松田宏雄  日本化学会講演予稿集  79th-  (1)  587  2001/03/15  [Not refereed][Not invited]
  
• Chiral interaction between medium-molecular-weight cholesteric liquid crystal and dopants.

  木戸脇匡俊, 守山雅也, 玉置信之  日本化学会講演予稿集  79th-  (1)  586  2001/03/15  [Not refereed][Not invited]
  
• Control of reflected color of medium-molecular-weight cholesteric liquid crystal. Effect of doped azobenzene derivatives with a cholesteryl group on cholesteric pitch.

  青木康幸, 守山雅也, 松田宏雄, 玉置信之  日本化学会講演予稿集  79th-  (1)  587  2001/03/15  [Not refereed][Not invited]
  
• 液晶応用デバイスのフロンティア カラー可逆記録用のコレステリック液晶材料

  守山雅也, 玉置信之, 松田宏雄  光学  30-  (1)  23  -24  2001/01/10  [Not refereed][Not invited]
  
• Cholesteric Crystalline Materials for Re-Writable Color Recording

  MORIYAMA Masaya, TAMAOKI Nobuyuki, MATSUDA Hiro  光学  30-  (1)  23  -24  2001/01/10  [Not refereed][Not invited]
  
• Induced-fit conformational changes in the cation-pi complexes of pyxophane: a DFT study

  M Yoshida, S Tsuzuki, N Tamaoki  JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2  7,1021-1023-  (7)  1021  -1023  2001  [Not refereed][Not invited]
   

  In contrast to the proposed structures of 1:1 complexes of the chair-form pyxophane double dagger1 with Na+ and `external' 2:1 complexes with K+, DFT calculations suggest that 1 prefers the saddle-form in the complexes due to the induced-fit conformational change and that 1 forms an 'internal' 2:1 complex with K+.
• Nano wiring technology by polymerization reaction in molecular structure. ( Chemical Technology Strategy Promotion Organization S ).

  玉置信之  有機ナノデバイスに向けたモジュール化技術ワークショップ報告書 平成13年  175  -183  2001  [Not refereed][Not invited]
  
• Solid films with iridescent reflection formed by self-assembly of liquid crystalline molecules

  MORIYAMA Masaya, TAMAOKI Nobuyuki  OYOBUTURI  70-  (9)  1078  -1081  2001  [Not refereed][Not invited]
   

  中分子コレステリック液BO8の溶液をスピンコートなどの方法で基板に塗布し,溶媒を急速に除去することによって,通常条件では液晶相を示さない室温付近の温度でも,らせん液晶配列を有し,一定の波畏の光を選択的に反射するガラス固体膜が迅速に形成される,さらに,反射光の波長は塗布する基板の温度を調整することで容易に制御可能である.この固体反射膜の形成は,溶媒が急速に除かれる非平衡状態下で,分子が自己組織化し,液晶相が発現するためであると推察される,この固体反射膜は簡単に積層させることができ,高密度分子メモリーデバイスとしての応用が期待できる.
• 中分子液晶による光情報記録

  玉置信之, 守山雅也, 松田宏雄  日本産業技術振興協会技術資料  (298)  62  -69  2000/10/20  [Not refereed][Not invited]
  
• Novel Optical Functions of Compounds Derived from Cholesterol.

  玉置信之  日本油化学会誌  49-  (10)  1041  -1049  2000/10/20  [Not refereed][Not invited]
  
• Novel Optical Functions of Compounds Derived from Cholesterol

  TAMAOKI Nobuyuki  Journal of Oleo Science  49-  (10)  1041  -1049  2000/10/20  [Not refereed][Not invited]
   

  A new cholesteric liquid crystals that respond quickly to stimuli such as temperature change or photoreaction of a doped compound in a liquid crystalline phase were found and stable molecular ordering below 80°C in the solid state brought about by rapid cooling from the liquid crystalline phase was noted. By changing the temperature at which rapid cooling start or degree of photoisomerization of photochromic compounds, colors from the visible spectral region reversibly fixed as interference colors. The compounds exhibited surface-directed self-assembly in a helical molecular ordering to form optically reflecting solid film on spin-coating from solution. All these may be considered properties of liquid crystals of medium-molecular-weight with over 1000 mass units. Through these properties, it is possible to obtain a re-writable full color recording in a photon or thermal mode.
• Change in the reflected color of photosensitive cholesteric liquid crystals with medium molecular weight.

  守山雅也, 玉置信之  光化学討論会講演要旨集  2000-  370  2000/09/10  [Not refereed][Not invited]
  
• コレステリック分子配列の光化学的制御と可逆的固定 フォトンモードでのフルカラー書き換え記録の可能性

  玉置信之, 守山雅也, 松田宏雄  化学と工業  53-  (8)  912  -917  2000/08/01  [Not refereed][Not invited]
  
• コレステリック分子配列の 光化学的制御と可逆的固定 -フォトンモードでのフルカラー書き換え記録の可能性

  玉置 信之, 守山 雅也, 松田 宏雄  化学と工業 = Chemistry and chemical industry  53-  (8)  912  -917  2000/08/01  [Not refereed][Not invited]
  
• フルカラーを可逆的に固定する液晶 リライタブルペーパーへの応用が期待される新しいコレステリック液晶

  玉置信之  液晶  4-  (3)  265  -272  2000/07/25  [Not refereed][Not invited]
  
• Liquid Crystls Reversible Fixing Full Color Information : A new type of Cholesteric Liquid Crystals Expected as the Material Applicable to Rewritable Paper

  TAMAOKI Nobuyuki  Journal of the Japanese Liquid Crystal Society  4-  (3)  265  -272  2000/07/25  [Not refereed][Not invited]
  
• 中分子コレステリック液晶を用いた光による書き換え可能なカラー画像記録

  守山雅也, 玉置信之, 松田宏雄  日本写真学会年次大会講演要旨  2000-  91  -92  2000/05/22  [Not refereed][Not invited]
  
• 中分子コレステリック液晶系フルカラー可逆記録材料の感熱記録特性

  杉本浩之, 二村恵朗, 平野成伸, 玉置信之, 松田宏雄  応用物理学関係連合講演会講演予稿集  47th-  (3)  1278  2000/03/28  [Not refereed][Not invited]
  
• Fixation of reflected color of non-symmetrical dicholesteryl esters.

  高橋敦, 玉置信之, 松田宏雄  日本化学会講演予稿集  78th-  (1)  588  2000/03/15  [Not refereed][Not invited]
  
• Polymerization of a diacetylene dicholesteryl ester in an organic gel phase.

  玉置信之, 島田悟, 岡田祐二, BELAISSAOUI A, KRUK G, 八瀬清志, 松田宏雄  日本化学会講演予稿集  78th-  (1)  585  2000/03/15  [Not refereed][Not invited]
  
• meta-Azobenzenophane: Synthesis, structure and isomerization of [1.1](3,3')azobenzenophane.

  北本虎吾郎, 玉置信之, 松田宏雄  日本化学会講演予稿集  78th-  (2)  1379  2000/03/15  [Not refereed][Not invited]
  
• Cholesteric liquid crystaslline properties and fixing of iridescent colors of the compounds with chiral schiff's base structures.

  野崎剛, 玉置信之, SESHADRI T, HAUPT H‐J, 松田宏雄  日本化学会講演予稿集  78th-  (1)  588  2000/03/15  [Not refereed][Not invited]
  
• Control of reflected color of medium-molecular-weight cholesteric liquid crystal.

  守山雅也, 玉置信之, SONG S, 松田宏雄  日本化学会講演予稿集  78th-  (1)  522  2000/03/15  [Not refereed][Not invited]
  
• Photochemical control of reflection bands of cholesteric solids.

  北本虎吾郎, 玉置信之, 松田宏雄  日本化学会講演予稿集  78th-  (1)  522  2000/03/15  [Not refereed][Not invited]
  
• Synthesis of medium-molecular-weight compounds with a cholesteric liquid crystalline property and their application to the rewritable color recording.

  玉置信之  電子情報通信学会技術研究報告  99-  (653(EID99 153-158))  1  -6  2000/02/24  [Not refereed][Not invited]
  
• Synthesis of medium-molecular-weight compounds with a cholesteric liquid crystalline property and their application to the rewritable color recording

  TAMAOKI Nobuyuki  IEICE technical report. Electronic information displays  99-  (653)  1  -6  2000/02/24  [Not refereed][Not invited]
   

  We introduce compounds having properties of regulating light in both active and passive ways. We specially explain our recent results on new type of non-polymeric cholesteric liquid crystals with a relatively high molecular weight. The liquid crystals present solid films with stable iridescent colors that can be controlled by the experienced thermal history or the photo reaction of a doped compound. Furthermore, it is possible to fix several different colors on a sheet of film that consists of a single type of molecule. The fixed colors are disappeared above 130℃. And new colors are fixed again after erasing. The liquid crystals with these properties have a potential for a rewritable full-color recording material.
• Synthesis of medium - molecular - weight compounds with a cholesteric liquid crystalline property and their application to the rewritable color recording

  TAMAOKI Nobuyuki  ITE Technical Report  24-  (16)  1  -6  2000/02/24  [Not refereed][Not invited]
   

  We introduce compounds having properties of regulating light in both active and passive ways. We specially explain our recent results on new type of non-polymeric cholesteric liquid crystals with a relatively high molecular weight. The liquid crystals present solid films with stable iridescent colors that can be controlled by the exprienced thermal history or the photo reaction of a doped compound. Furthermore, it is possible to fix several different colors on a sheet of film that consists of a single type of molecule. The fixed colors are disappeared above 130℃. And new colors are fixed again after erasing. The liquid crystals with these properties have a potential for a rewritable full-color recording material.
• Liquid crystals reversibly fixing full-color information. Realization of re-writable paper using a new type of cholesteric liquid crystals.

  玉置信之  Optronics  (218)  168  -173  2000/02/10  [Not refereed][Not invited]
  
• Rewritable full-color recording material using cholesteric liquid crystal.

  玉置信之  コンバーテック  28-  (1)  74  -78  2000/01/15  [Not refereed][Not invited]
  
• コレステリック液晶による書き換え可能フルカラー記録材料

  玉置 信之  コンバ-テック  28-  (1)  74  -78  2000/01  [Not refereed][Not invited]
  
• 記録用コレステリック光学フィルム 熱応答性フルカラー表示素子

  玉置信之  ポリマーフロンティア21講演要旨集  1999-  (2)  19  -23  1999/06/18  [Not refereed][Not invited]
  
• Solid phase polymerization of diacetylene derivatives with cholesteryl groups and the third-order nonlinear optical property of the polymer.

  玉置信之, PARFENOV A, 松田宏雄, 横沢伊裕, 横尾泰日児  高分子学会予稿集  48-  (3)  372  1999/05/12  [Not refereed][Not invited]
  
• Molecular capsules recognizing and taking in molecule pairs.

  玉置信之  化学と工業  52-  (5)  634  1999/05/01  [Not refereed][Not invited]
  
• 分子ペア-を認識して取り込む分子カプセル

  玉置 信之  化学と工業 = Chemistry and chemical industry  52-  (5)  634  -634  1999/05  [Not refereed][Not invited]
  
• コレステリックピッチによる旋光分散を利用した全固体ORD‐Kerr shutter

  横沢伊裕, 松本幸男, 横尾泰日児, 玉置信之, 松田宏雄  応用物理学関係連合講演会講演予稿集  46th-  (3)  1231  1999/03/28  [Not refereed][Not invited]
  
• The Cholesteric Solid Films Formed by Self-assembly of Medium-Molecular-Weight Liquid Crystals from their Solutions.

  守山雅也, 玉置信之, 松田宏雄  日本化学会講演予稿集  76th-  (1)  273  1999/03/15  [Not refereed][Not invited]
  
• Photochemical control and reversible fixing of iridescent colors of medium-molecular-weight cholesteric liquid crystals. (1).

  玉置信之, 守山雅也, 松田宏雄, SONG S  日本化学会講演予稿集  76th-  (1)  398  1999/03/15  [Not refereed][Not invited]
  
• Photochemical control and reversible fixing of iridescent colors of medium-molecular-weight cholesteric liquid crystals. (2).

  北本虎吾郎, 玉置信之, 山岡亜夫, 高原茂, 宮川信一, 松田宏雄  日本化学会講演予稿集  76th-  (1)  611  1999/03/15  [Not refereed][Not invited]
  
• Optical and thermal properties of cholesteric solid from dicholesteryl esters of diacetylenedicarboxylic acid

  Nobuyuki Tamaoki, Grzcgorz Kruk, Hiro Matsuda  Journal of Materials Chemistry  9-  (10)  2381  -2384  1999  [Not refereed][Not invited]
   

  Dicholesteryl esters of diacetylenedicarboxylic acid with different lengths of methylene linkages were synthesised. Compounds with (CH2)(n) (n = 2, 4, 5, 6, 7, 8, 10) showed a cholesteric phase. Phase transition temperatures from the isotropic phase to the anisotropic phase showed an odd- even effect of the number of (CH2) units. By rapid cooling from the cholesteric phase to 0°C, the compounds were solidified retaining the cholesteric colours (cholesteric solid), some of which were stable at room temperature. Changing the temperature at which rapid cooling started changed the colours of the cholesteric solid. The thermal stability of the cholesteric solid also showed an odd-even effect of the number of (CH2) units. The effect can be explained by the difference in the stable structures of the molecules and the strength of the weak intermolecular interactions via carbonyl groups between the compounds with odd and even (CH2), which was observed in the FT-IR spectra.
• Reversible full color reversible recording by cholesteric liquid crystal.

  玉置信之, PARFENOV A V, 正木篤, 松田宏雄  日本産業技術振興協会技術資料  (279)  107  -108  1998/10/16  [Not refereed][Not invited]
  
• 中分子液晶からなるコレステリックガラスの光学的・熱的特性 (1)

  玉置信之, KRUK G, 松田宏雄  日本液晶学会討論会講演予稿集  1998-  310  -311  1998/10/12  [Not refereed][Not invited]
  
• 中分子液晶からなるコレステリックガラスの光学的・熱的特性 (3)

  高橋敦, 玉置信之, 松田宏雄  日本液晶学会討論会講演予稿集  1998-  314  -315  1998/10/12  [Not refereed][Not invited]
  
• Interference Color of a Cholesteric Medium-Molecular-Weight-Molecule and Its Reversible Fixing.

  玉置信之  高分子  47-  (10)  760  1998/10  [Not refereed][Not invited]
  
• Interference Color of a Cholesteric Medium-Molecular-Weight-Molecule and Its Reversible Fixing

  TAMAOKI Nobuyuki  Kobunshi  47-  (10)  760  -760  1998/10  [Not refereed][Not invited]
  
• Liquid crystals storing color.

  玉置信之  工業技術  39-  (7)  32  -33  1998/07  [Not refereed][Not invited]
  
• Rewritable full color record materialsusing cholesteric liquid crystals.

  玉置信之, 松田宏雄  物質研News  32-  (32)  1  -2  1998/07  [Not refereed][Not invited]
  
• Photomodification of polymer films: Azobenzene-containing polyurethanes

  M. Itoh, K. Harada, H. Matsuda, S. Ohnishi, A. Parfenov, N. Tamaoki, T. Yatagai  Journal of Physics D: Applied Physics  31-  (5)  463  -471  1998/03/07  [Not refereed][Not invited]
   

  New results are presented on optical recording to the films of polymers substituted with azo dyes. Holographic gratings are formed in the polyurethane films by exposure to Ar+ laser light without any post-treatment as in previous works using polyacrylales, epoxy-based polymers and polyesters substituted with azo dyes. It is shown for the first time that the principal mechanism of optical recording could be the mass transfer of polymers during the cis-trans isomerization of azo dye units on the polymers from illuminated areas to non-illuminated areas. Besides this transport, some irreversible photochemical reactions involving atmospheric oxygen are suggested as another possible origin for the holographic recording.
• Optical and Thermal Properties of Cholesteric Glass from Liquid Crystalline Compounds with Medium-Molecubr Weight (3)

  TAKAHASHI Atsushi, TAMAOKI Nobuyuki, MATSUDA Hiro  Proceedings of Japanese Liquid Crystal Society Annual meeting  1998-  (0)  314  -315  1998  [Not refereed][Not invited]
   

  The liquid crystalline compounds consisting of two cholesteryl and one phenoxy groups connected by methylene units were synthesized. This compound in its choresteric phase shows typical reflex colors ranging from blue to red depending on the temperature. When the compound showing the reflex colors was quickly cooled down to 0℃, it solidified while keeping the reflex color. Cholesteric glass put between glass plates after the rapid cooling process showed transmission spectra with the wavelength of the peak ranging from 440nm to 640nm. It showed narrow spectral band and about 50% of reflectivity. Relationship between temperature at which rapid cooling started and wavelength of the peaks in the transmission band for the cholesteric films showed that the peak of the reflection bands shifted to longer wavelength as the temperature is raised. The solid sample with colors can be solidified again with the different colors if it is rapidly cooled after it is heated to cholesteric phase.
• Optical and Thermal Properties of Cholesteric Glass from Liquid Crystalline Compounds with Medium-Molecular Weight (2)

  KRUK Grzegorz, TAMAOKI Nobuyuki, MATSUDA Hiro, KIDA Yoshishige  Proceedings of Japanese Liquid Crystal Society Annual meeting  1998-  (0)  312  -313  1998  [Not refereed][Not invited]
   

  Liquid crystalline and optical properties of four dicholesteryl derivatives having various linkage configurations, while the same number of connecting carbons (18) have been investigated, using differential scanning calorimetry (DSC), polarizing optical microscopy, Fourier Transform Infra-Red (FTIR) spectroscopy and UV-VIS spectroscopy. Quite different phase behavior and optical properties have been found for each of those compounds, while all of them exhibited behavior, specific for a cholesteric phase. It was difficult, however possible to fix stable, various colors for one compound with linking (CH_2)_<18> alkyl chain. It was much easier to fix less stable colors for samples with linking (CH_2)_6 and the C=C double bonds between them. Very unstable colors could also be fixed for the compound with the (CH_2)_7 alkyl chains and diyne group. The fourth compound with side alkyl chain being in eholesteric phase showed colors at room temperature. FTIR spectroscopy measurements provided interesting results concerning average molecular configuration change between blue cholesteric solid and crystal, for the compound with the (CH_2)_7 alkyl chains which crystallized within a few hours, also frequency changes of some bands were found and reported. As one could expect, and as it has been found using the DSC and Polarizing Microscopy, the linkages of the same number of carbons, while having different configurations provide absolutely different optical properties and transition temperatures.
• Optical and Thermal Properties of Cholesteric Glass from Liquid Crystalline Compounds with Medium-Molecular Weight (1)

  TAMAOKI Nobuyuki, KRUK Grzegorz, MATSUDA Hiro  Proceedings of Japanese Liquid Crystal Society Annual meeting  1998-  (0)  310  -311  1998  [Not refereed][Not invited]
   

  Dicholesteryl esters of diacetylenedicaboxylic acid with different length of methylene linkages are synthesized. Compounds with (CH2)n (n=2,4,5,6,7,8,10) showed a cholesteric phase. Phase transition temperatures from isotropic phase to cholesteric phase (to crystalline phase in the case of n=3,5) showed an odd-even effect of the number of (CH2). By rapid cooling from the cholesteric phase to 0 ℃, the compounds were solidified keeping the cholesteric colors (choresteric glass). The colors of the choleseric glass were changed by changing the temperature at which rapid cooling starts. The thermal stability of the cholesteric solid also showed an odd-even effect of the number of (CH2). The effect can be explained by the difference of stable structures of the molecules and the strength of week inter-molecular interactions via carbonyl groups which is observed in the FT-IR spactra.
• Rewritable full-colour recording on a thin solid film of a cholesteric low-molecular-weight compound.

  玉置信之, PARFENOV A V, 正木篤, 松田宏雄  日本化学会講演予稿集  73rd-  185  1997/09  [Not refereed][Not invited]
  
• Polymers containing rotaxane structures in the main chain. Syntheses of bi-functional rotaxane and the reactivity.

  玉置信之, 島田悟  高分子学会予稿集  46-  (2)  297  1997/05  [Not refereed][Not invited]
  
• Topo-polymers.Polymers with catenane or rotaxane structure in the main chain.

  玉置信之, 島田悟  物質研News  (24)  1  -2  1997/03  [Not refereed][Not invited]
  
• Interlocked polymer.

  島田悟, 玉置信之, 石川啓一郎  日本産業技術振興協会技術資料  (262)  125  -126  1996/10/25  [Not refereed][Not invited]
  
• Polymer Chemistry and Technology for the 21st Century. Topochemical Polymerization.

  玉置信之  ペトロテック  19-  (10)  826  -827  1996/10  [Not refereed][Not invited]
  
• トポケミカル重合

  玉置 信之  ペトロテック = Petrotech  19-  (10)  826  -827  1996/10/01  [Not refereed][Not invited]
  
• Interlocked Polymer. III . Synthesis and Polycondensation of 2-Catenane Monomer.

  島田悟, 玉置信之, 石川啓一郎  高分子学会予稿集  44-  (2)  249  1995/05  [Not refereed][Not invited]
  
• リライト記録・表示材料の可能性--高分子薄膜系可逆記録材料の現状

  山岡 亜夫, 玉置 信之  染料と薬品  40-  (3)  p61  -76  1995/03  [Not refereed][Not invited]
  
• Rewritable recording materials based on polymeric films

  山岡亜夫, 玉置信之  Senryo to Yakuhin, 40(3), 61-76(1995)  40-  (3)  61  -76  1995/03  [Not refereed][Not invited]
  
• Photolysis of Benzenediazonium Salts by Excitation of the Anion.

  高橋寧, 玉置信之, 山岡亜夫  日本化学会講演予稿集  68th-  219  1994/09  [Not refereed][Not invited]
  
• Patterning of non-linear optical materials. (1). Change of third order non-linear optical properties of spiropyranes with long alkyl chains induced by photoisomerization.

  玉置信之, VAN KEUREN E, 関隆広, 松田宏雄, 長谷川寛, 山岡亜夫  応用物理学会学術講演会講演予稿集  55th-  (3)  1022  1994/09  [Not refereed][Not invited]
  
• Interlocked Polymer. I . The Synthesis of the Catenane Polymer.

  島田悟, 玉置信之  高分子学会予稿集  43-  (2)  350  1994/05  [Not refereed][Not invited]
  
• An Approach toward Cyclocarbon. Syntheses of Hydrated C18 and C24.

  玉置信之, 石川啓一郎, 南信次  日本化学会講演予稿集  67th-  (2)  1134  1994/03  [Not refereed][Not invited]
  
• Photochemistry of benzenediazonium anthracenesulfonates: Photolysis of benzenediazonium salts by excitation of the anion

  Nobuyuki Tamaoki, Yasushi Takahashi, Tsuguo Yamaoka  Journal of the Chemical Society, Chemical Communications  (15)  1749  -1750  1994  [Not refereed][Not invited]
   

  4-Substituted benzenediazonium 1,8-dimethoxyanthracene-3-sulfonates photodecompose under visible light, which is absorbed only by the anionic part, via intra-ion pair electron transfer from the excited anionic part to the benzene diazonium.
• An Approach toward Cyclocarbon. -Syntheses of Hydrated Cyclocarbons-

  玉置信之, 石川啓一郎, 南信次  Journal of NIMC, 1(3), 151(1993)  1-  (3)  151  -154  1993/12  [Not refereed][Not invited]
  
• N位にアゾベンゼンを有するチエニルフルギミドの合成とその異性化挙動

  落合成雄, 玉置信之, 小林宏, 中西房枝  日本化学会講演予稿集  65th-  (2)  288  1993/03  [Not refereed][Not invited]
  
• 環状炭素へのアプロ-チ--環状炭素水和物の合成

  玉置 信之, 石川 啓一郎, 南 信次  物質工学工業技術研究所報告  1-  (3)  p151  -154  1993  [Not refereed][Not invited]
  
• Thermo-optic effects of 4-alkoxy-3-chlorobenzoic acids in polymeric matrices

  Yasushi Takahashi, Nobuyuki Tamaoki, Yuichi Komiya, Yoshihiro Hieda, Kenichi Koseki, Tsuguo Yamaoka  Journal of Applied Physics  74-  (6)  4158  -4162  1993  [Not refereed][Not invited]
   

  Polymer films containing 4-alkoxy-3-chlorobenzoic acid heated to 140°C showed two optically different states at room temperature depending on the cooling rate. If after heating the film cooled rapidly, it froze in the transparent state. In contrast, it reverted to the light scattering state when cooled slowly. Cycles between the two optical states were reproducible, therefore these films may offer potential as a rewritable recording material. The reversibility in the optical transmittance may be caused by a reversible change in the crystal size of the acid in the polymer matrix.
• A Photochromic Memory with a Non-destructive Read-out Property.

  玉置信之, 吉村佐和子, 山岡亜夫  高分子学会予稿集  41-  (3)  540  1992/05  [Not refereed][Not invited]
  
• Effects of Phases on Photo-polymerization of Bi-functional Liquid Crystalline Monomers.

  玉置信之, 小野雅行, 山岡亜夫  高分子学会予稿集  40-  (2)  194  1991/05  [Not refereed][Not invited]
  
• Reversible Thermo-recording Material Using Polymer/Liquid Crystalline Compound.

  玉置信之, 高橋寧, 山岡亜夫, 小関健一, 稗田嘉弘  高分子学会予稿集  40-  (3)  465  1991/05  [Not refereed][Not invited]
  
• Studies on a novel imaging process of Lippmannhologram.

  生井秀一, 玉置信之, 小関健一, 山岡亜夫  高分子学会予稿集  40-  (3)  496  1991/05  [Not refereed][Not invited]
  
• Formation of Acyclic cis-Azobenzene without Light

  Tamaoki Nobuyuki, Yoshimura Sawako, Yamaoka Tsuguo  Bull. Chem. Soc. Jpn., 64(6), 2011(1991)  64-  (6)  2011  -2012  1991  [Not refereed][Not invited]
   

  Reduction mixture of bis(4-nitrobenzyl) ether contained a considerable amount of cis-4,4′-dimethylazobenzene.
• 環状アゾベンゼン2量体のフォトクロミズムにおける光強度依存性

  玉置信之, 小関健一, 山岡亜夫  日本化学会講演予稿集  60th-  (2)  632  1990/09  [Not refereed][Not invited]
  
• The photo- and thermal cis-trans isomerization of [23](4,4′)azobenzenophane

  Nobuyuki Tamaoki, Kenichi Koseki, Tsuguo Yamaoka  Tetrahedron Letters  31-  (23)  3309  -3312  1990  [Not refereed][Not invited]
   

  The cis-trans isomerization of the title compound in methanol has been investigated kinetically by HPLC, confirming the existence of relatively stable four isomers and giving the thermodynamic parameters of the isomerization among the isomers. © 1990.
• Reversible change in optical rotation of cholesteric liquid crystalline polymer accompanied by photochromism.

  鈴木靖三, 玉置信之, 市村国宏, 山内愛造  日本産業技術振興協会技術資料  (171)  155  -162  1987/12/01  [Not refereed][Not invited]
  
• Thermally stable iridescent colors of a new low-molecular-weight cholesteric compound in the solid and the application to full-color recording

  Mat. Res. Soc. Symp. Proc., 488, 915-919(1998)  [Not refereed][Not invited]
  
• Synthesis and Switchable Condensation Reaction of Bifunctional [2]Catenanes

  Acta Chemica Scandinavica, 52, 374-376(1998)  [Not refereed][Not invited]
  
• Optical and Liquid Crystalline Properties of Dicholestery Derivatives having Different Linkage Configurations of Hydrocarbon Analogues

  Liquid Crystals, 26(11), 1687-1694(1999)  [Not refereed][Not invited]
  
• Microfabrication of Electro-Optical Structures in Polymer Films : Novel Polymer Waveguide Structure for Spatial Light Modulation

  Trends in Optics and Photonics, 14, 132-1137(1997)  [Not refereed][Not invited]
  
• A Photochromic Memory with a Non-detructive Read-out Property

  Thin Solid Films, 221, 132(1992)  [Not refereed][Not invited]
  

Industrial Property Rights

• 特開2019-096673:パターンの製造方法および半導体装置の製造方法  2019/06/20

  玉置 信之, キム ユナ  国立大学法人北海道大学  201903004915983462
• 特許第5757517号:イオン性有機化合物及びその製法、並びに該イオン性有機化合物からなるハイドロゲル化剤、それを含むハイドロゲル、メタノールゲル化剤、それを含むメタノールゲルおよびカーボンナノチューブ分散剤  

  吉田 勝, 甲村 長利, 大山 春美, 玉置 信之  国立研究開発法人産業技術総合研究所  201503009824033987
• 特許第5519251号:固体レーザー発振デバイス及びレーザー発振用組成物  

  古海 誓一, 玉置 信之  独立行政法人物質・材料研究機構, 国立大学法人北海道大学  201403041273728299
• 特許第5481672号:ジアントラセンのアモルファスポリマーを用いた情報記録材料及び情報記録方法  

  木原 秀元, 本橋 壮志, 玉置 信之  独立行政法人産業技術総合研究所  201403076848117490
• 特許第5403578号:有機半導体薄膜及びこれを用いた有機薄膜トランジスター  

  舟橋 正浩, 張 発培, 玉置 信之  独立行政法人産業技術総合研究所  201403008283016419
• 特許第5360794号:糖アルコールエステル又はエーテル、コレステリック液晶添加剤、液晶組成物及び表示素子  

  秋山 陽久, 玉置 信之, 田中明日香, 平松秀夫  独立行政法人産業技術総合研究所  201403085240473314
• 特許第5334115号:光応答性キラル化合物  

  玉置 信之, マノジ マシューズ, 長沢 順一  独立行政法人産業技術総合研究所  201403016474733083
• 特許第5146810号:液晶化合物  

  舟橋 正浩, 玉置 信之  独立行政法人産業技術総合研究所  201303039488976917
• 特許第5110564号:イオン性有機化合物及びその製造方法、並びに該イオン性有機化合物からなるハイドロゲル化剤及びハイドロゲル  

  三澤 善大, 吉田 勝, 甲村 長利, 玉置 信之  独立行政法人産業技術総合研究所  201303080695424509
• 特許第5087762号:光感応性液晶性組成物を内包するマイクロカプセル、およびこのマイクロカプセルを含む可逆記録材料  

  青木 康幸, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所  201303012881973894
• 特許第5083980号:アントラセン誘導体及びその二量体、これらを用いた光情報記録体並びに光情報記録方法  

  木原 秀元, 李 鍾百, 玉置 信之  独立行政法人産業技術総合研究所  201303006898300621
• 特許第5071922号:温度又は光によってカラー画像を記録消去できる液晶材料、及びそれを用いた記録方法ないし情報記録装置  

  玉置 信之, アジャ マリア, スレッシュ ダス, シブ アブラハム  独立行政法人産業技術総合研究所  201303009128311187
• 特許第5071921号:スメクティック液晶化合物  

  舟橋 正浩, 張 発培, 玉置 信之  独立行政法人産業技術総合研究所  201303056036268224
• 特許第5067776号:レーザー発振用組成物とレーザー発振デバイス並びにその製造方法  

  玉置 信之, 古海 誓一, 目 義雄  独立行政法人産業技術総合研究所, 独立行政法人物質・材料研究機構  201303029054153194
• 特許第5051520号:光反応性液晶性モノマー及びそれを用いた主鎖型液晶ポリマーの製造方法  

  木原 秀元, 本橋 壮志, 玉置 信之  独立行政法人産業技術総合研究所  201303071516195773
• 特許第4997598号:ホール伝導性コレステリック液晶化合物  

  舟橋 正浩, 玉置 信之  独立行政法人産業技術総合研究所  201303034855600633
• 特許第4934797号:イオン性有機化合物  

  吉田 勝, 甲村 長利, 玉置 信之, 川波 肇, 松本 一, カザウィ サイ, 南 信次  独立行政法人産業技術総合研究所  201303071467798246
• 特許第4911522号:液晶化合物およびこれを用いた薄膜トランジスター  

  舟橋 正浩, 張 発培, 玉置 信之  独立行政法人産業技術総合研究所  201303002451145500
• 特許第4863100号:記録表示媒体及びその製造方法  

  高橋 敦, 玉置 信之  独立行政法人産業技術総合研究所, 共同印刷株式会社  201303055979403205
• 特許第4836144号:イオン性有機化合物及びその製法、並びに該イオン性有機化合物からなるハイドロゲル化剤及びハイドロゲル  

  吉田 勝, 三澤 善大, 甲村 長利, 玉置 信之  独立行政法人産業技術総合研究所  201303000352050820
• 特許第4825355号:コレステリック液晶及び記録表示材料  

  高橋 敦, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 共同印刷株式会社, 玉置 信之, 松田 宏雄  201303012132886004
• 特許第4811650号:感温性高分子化合物  

  秋山 陽久, 玉置 信之  独立行政法人産業技術総合研究所  201303019158059593
• 特許第4811642号:イオン性ゲル電解質、色素増感型光電変換素子及び太陽電池  

  甲村 長利, 原 浩二郎, ワン・ジョンシェン, 吉田 勝, 玉置 信之  独立行政法人産業技術総合研究所  201303086407762118
• 特許第4766321号:コレステリック液晶化合物  

  舟橋 正浩, 玉置 信之  独立行政法人産業技術総合研究所  201303022236780076
• 特許第4756268号:コレステリック液晶化合物  

  舟橋 正浩, 玉置 信之  独立行政法人産業技術総合研究所  201303069680032465
• 特開2011-108952:固体レーザー発振デバイス及びレーザー発振用組成物  2011/06/02

  古海 誓一, 玉置 信之  独立行政法人物質・材料研究機構, 国立大学法人北海道大学  201103021998003408
• 特開2011-046833:フォトクロミック無機高分子形成用組成物、フォトクロミック体  2011/03/10

  則包 恭央, 吉田 勝, 玉置 信之  独立行政法人産業技術総合研究所  201103094622757476
• 特許第4669124号:ジコレステリルエステル及び記録表示材料  

  高橋 敦, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 共同印刷株式会社, 玉置 信之, 松田 宏雄  201103001375114771
• 特許第4660737号:スピロ化合物およびその製造方法、ならびにそれを用いた光応答性組成物および光応答性高分子  

  玉置 信之, リジュ デイビス  独立行政法人産業技術総合研究所  201103017035581913
• 特許第4614405号:ジコレステリルエステル化合物及び記録表示材料  

  高橋 敦, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 共同印刷株式会社, 玉置 信之, 松田 宏雄  201103086253451187
• 特許第4590611号:ジアセチレンジアミド化合物  

  玉置 信之, 青木 健一  独立行政法人産業技術総合研究所  201103007021385806
• 特許第4586190号:アゾベンゼン化合物及びそれよりなるゲル化剤とその製造方法  

  甲村 長利, 工藤 成史, 玉置 信之  独立行政法人産業技術総合研究所  201103019116984918
• 特許第4555973号:ジコレステリルエステル化合物及び記録表示材料  

  高橋 敦, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 共同印刷株式会社, 玉置 信之, 松田 宏雄  201103047528600417
• WO2010-027067:イオン性有機化合物及びその製法、並びに該イオン性有機化合物からなるハイドロゲル化剤、それを含むハイドロゲル、メタノールゲル化剤、それを含むメタノールゲルおよびカーボンナノチューブ分散剤  2010/03/11

  吉田 勝, 甲村 長利, 大山 春美, 玉置 信之  独立行政法人産業技術総合研究所  201203014038003234
• 特開2010-030997:光応答性キラル化合物  2010/02/12

  玉置 信之, マノジ マシューズ, 長沢 順一  独立行政法人産業技術総合研究所  201003046215418070
• 特開2010-006712:アントラセン誘導体及びその二量体、これらを用いた光情報記録体並びに光情報記録方法  2010/01/14

  木原 秀元, 李 鍾百, 玉置 信之  独立行政法人産業技術総合研究所  201003017983499216
• 特許第4434415号:新規シッフ塩基誘導体、該誘導体の製造方法、該誘導体を含むフルカラー感熱記録材料及びフルカラー感熱記録媒体  

  玉置 信之, 松田 宏雄, 野崎 剛, タリマラ セシャデュリ, ハンス-ヤルゲン ハウト  独立行政法人産業技術総合研究所, 玉置 信之, コニカミノルタホールディングス株式会社, 松田 宏雄  201103067659667640
• 特開2009-256485:ジアントラセンのアモルファスポリマーおよびそのポリマーを用いた光情報記録薄膜材料  2009/11/05

  木原 秀元, 本橋 壮志, 玉置 信之  独立行政法人産業技術総合研究所  200903014968577073
• 特開2009-231407:有機半導体薄膜及びこれを用いた有機薄膜トランジスター  2009/10/08

  舟橋 正浩, 張 発培, 玉置 信之  独立行政法人産業技術総合研究所  200903032872626659
• 特開2009-137848:液晶化合物  2009/06/25

  舟橋 正浩, 玉置 信之  独立行政法人産業技術総合研究所  200903067945361835
• 特許第4322485号:書換え可能フルカラー記録材料  

  玉置 信之, 松田 宏雄, 木田 ▲吉▼重, 井関 清治, 上畑 雅司  独立行政法人産業技術総合研究所, 岡村製油株式会社  201103023686471024
• 特許第4287016号:可逆記録媒体  

  杉本 浩之, 二村 恵朗, 筒井 恭治, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー  201103084750186273
• 特開2009-057506:液晶化合物およびこれを用いた薄膜トランジスター  2009/03/19

  舟橋 正浩, 張 発培, 玉置 信之  独立行政法人産業技術総合研究所  200903087951166506
• 特開2009-046402:ホール伝導性コレステリック液晶化合物  2009/03/05

  舟橋 正浩, 玉置 信之  独立行政法人産業技術総合研究所  200903089819209371
• 特許第4257415号:カードを用いた画像提供装置  

  玉置 信之, 北川 由紀子  独立行政法人産業技術総合研究所  201103017489120503
• 特開2008-303209:糖アルコールエステル又はエーテル、コレステリック液晶添加剤、液晶組成物及び表示素子  2008/12/18

  秋山 陽久, 玉置 信之, 田中明日香, 平松秀夫  独立行政法人産業技術総合研究所  200903026764715416
• 特開2008-260846:光反応性液晶性モノマー及びそれを用いた主鎖型液晶ポリマーの製造方法  2008/10/30

  木原 秀元, 本橋 壮志, 玉置 信之  独立行政法人産業技術総合研究所  200903063126540377
• 特開2008-248224:イオン性有機化合物及びその製法、並びに該イオン性有機化合物からなるハイドロゲル化剤及びハイドロゲル  2008/10/16

  吉田 勝, 三澤 善大, 甲村 長利, 玉置 信之  独立行政法人産業技術総合研究所  200903048464239152
• 特開2008-214529:イオン性有機化合物及びその製造方法、並びに該イオン性有機化合物からなるハイドロゲル化剤及びハイドロゲル  2008/09/18

  三澤 善大, 吉田 勝, 甲村 長利, 玉置 信之  独立行政法人産業技術総合研究所  200903005783179862
• 特許第4169467号:可逆記録材料  

  二村 恵朗, 杉本 浩之, 平野 成伸, 玉置 信之, 松田 宏雄, 木田 吉重  株式会社リコー, 玉置 信之, 松田 宏雄, 岡村製油株式会社, 独立行政法人産業技術総合研究所  201103001404320408
• 特許第4169443号:可逆記録媒体、および該可逆記録媒体を使用した記録方法  

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  201103037279945756
• 特許第4169421号:多色画像記録方法、および多色画像記録装置  

  杉本 浩之, 二村 恵朗, 玉置 信之, 松田 宏雄, 木田 吉重  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  201103075661596981
• 特開2008-127280:温度又は光によってカラー画像を記録消去できる液晶材料、及びそれを用いた記録方法ないし情報記録装置  2008/06/05

  玉置 信之, アジャ マリア, スレッシュ ダス, シブ アブラハム  独立行政法人産業技術総合研究所  200903031721128472
• 特許第4117080号:可逆記録媒体、該可逆記録媒体を使用した記録方法および可逆記録装置  

  杉本 浩之, 二村 恵朗, 筒井 恭治, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー  201103020719442700
• 特許第4076712号:可逆記録媒体および可逆記録方法  

  杉本 浩之, 二村 恵朗, 平野 成伸, 玉置 信之, 松田 宏雄, 木田 吉重  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  201103056746880013
• 特許第4076683号:多色画像記録方法および多色画像記録装置  

  杉本 浩之, 二村 恵朗, 玉置 信之, 松田 宏雄, 木田 吉重  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  201103021014368532
• 特許第4076686号:可逆記録媒体、および該可逆記録媒体を使用した記録方法  

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  201103085856316989
• 特開2008-013539:スメクティック液晶化合物  2008/01/24

  舟橋 正浩, 張 発培, 玉置 信之  独立行政法人産業技術総合研究所  200903082988345298
• 特許第4051445号:液晶記録媒体の製造方法  

  秋山 陽久, 玉置 信之  独立行政法人産業技術総合研究所  201103046947890569
• 特開2007-308418:コレステリック液晶化合物  2007/11/29

  舟橋 正浩, 玉置 信之  独立行政法人産業技術総合研究所  200903069719258781
• 特許第4040230号:光記録装置  

  杉本 浩之, 二村 恵朗, 豊島 伸朗, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー  201103007126187902
• 特許第4032089号:記録表示媒体  

  高橋 敦, 小泉 真一, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所  201103050928737501
• 特許第4029305号:液状化対策構造及び液状化対策方法  

  玉置 克之, 風間 広志, 尾上 篤生, 三宅 紀治, 前田 信之, 吉見 吉昭  清水建設株式会社  201103012299907955
• 特開2007-262232:感温性高分子化合物  2007/10/11

  秋山 陽久, 玉置 信之  独立行政法人産業技術総合研究所  200903080117665134
• 特開2007-217443:コレステリック液晶化合物  2007/08/30

  舟橋 正浩, 玉置 信之  独立行政法人産業技術総合研究所  200903079052089809
• 特開2007-115605:イオン性ゲル電解質、色素増感型光電変換素子及び太陽電池  2007/05/10

  甲村 長利, 原 浩二郎, ワン・ジョンシェン, 吉田 勝, 玉置 信之  独立行政法人産業技術総合研究所  200903048971058941
• 特許第3911560号:電荷移動錯体及びその作成方法  

  玉置 信之, 木戸脇匡俊  独立行政法人産業技術総合研究所  201103058437334791
• 特開2007-027702:レーザー発振用組成物とレーザー発振デバイス並びにその製造方法  2007/02/01

  玉置 信之, 古海 誓一, 目 義雄  独立行政法人産業技術総合研究所, 独立行政法人物質・材料研究機構  200903081222824791
• 特許第3896565号:液晶性物質を用いた光情報記録方法  

  守山 雅也, 玉置 信之  独立行政法人産業技術総合研究所, 独立行政法人科学技術振興機構  201103026625927911
• 特開2006-337891:記録表示媒体及びその製造方法  2006/12/14

  高橋 敦, 玉置 信之  独立行政法人産業技術総合研究所, 共同印刷株式会社  200903066698879510
• 特許第3876320号:一方向に配合したジアセチレン化合物を含む有機溶媒ゲル化物  

  長沢 順一, 工藤 成史, 玉置 信之  独立行政法人産業技術総合研究所  201103045847767593
• 特開2006-225267:スピロ化合物およびその製造方法、ならびにそれを用いた光応答性組成物および光応答性高分子  2006/08/31

  玉置 信之, リジュ デイビス  独立行政法人産業技術総合研究所  200903033950287285
• WO2006-082768:イオン性有機化合物  2006/08/10

  吉田 勝, 甲村 長利, 玉置 信之, 川波 肇, 松本 一, カザウィ サイ, 南 信次  独立行政法人産業技術総合研究所  200903067641492003
• 特開2006-116873:可逆性記録媒体  2006/05/11

  寺井 智彦, 玉置 信之  三菱樹脂株式会社, 独立行政法人産業技術総合研究所  200903099364898128
• 特開2006-063045:ジアセチレンジアミド化合物  2006/03/09

  玉置 信之, 青木 健一  独立行政法人産業技術総合研究所  200903007595819849
• 特許第3754825号:三次非線形光学材料及びジアセチレンエステル並びにその製造方法  

  玉置 信之, 松田 宏雄, 横尾 泰日児, 横沢 伊裕, 松本 幸男  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 宇部興産株式会社  201103049536297793
• 特許第3749947号:ジコレステリルジアセチレン誘導体  

  長沢 順一, 工藤 成史, 玉置 信之  独立行政法人産業技術総合研究所  201103092052146041
• 特開2005-314261:アゾベンゼン化合物及びそれよりなるゲル化剤とその製造方法  2005/11/10

  甲村 長利, 工藤 成史, 玉置 信之  独立行政法人産業技術総合研究所  200903039056961002
• 特許第3699994号:光による水濡れ性制御型フイルム、及びその製法  

  秋山 陽久, 玉置 信之  独立行政法人産業技術総合研究所  201103049273765690
• 特開2005-111909:カードおよびそれを用いた画像提供装置  2005/04/28

  玉置 信之, 北川 由紀子  独立行政法人産業技術総合研究所  200903026377333939
• 特開2005-111935:露光装置  2005/04/28

  玉置 信之, 舘 範夫, 矢崎 芳博, 桑原 裕二  独立行政法人産業技術総合研究所, 有限会社インターウェーブ, 有限会社ランダムエレクトロニクスデザイン, クワテック株式会社  200903040628447478
• 特許第3661016号:書き換え可能なカラー画像記録媒体及びそれを用いた画像形成方法  

  玉置 信之, アレクサンダー パルフェノフ, 正木 篤, 松田 宏雄  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄  201103041379177249
• 特開2005-082604:高分子重合体、液晶記録媒体及び液晶記録媒体の製造方法  2005/03/31

  秋山 陽久, 玉置 信之  独立行政法人産業技術総合研究所  200903014944616795
• 特開2005-042069:一方向に配合したジアセチレン化合物を含む有機溶媒ゲル化物  2005/02/17

  長沢 順一, 工藤 成史, 玉置 信之  独立行政法人産業技術総合研究所  200903088578238018
• 特許第3590863号:光感応部位を有する液晶性化合物、液晶添加剤及び光記録媒体  

  玉置 信之, 松田 宏雄, 守山 雅也  独立行政法人産業技術総合研究所, 独立行政法人 科学技術振興機構, 玉置 信之, 松田 宏雄  201103012295887941
• 特開2004-099451:書換え可能フルカラー記録材料  2004/04/02

  玉置 信之, 松田 宏雄, 木田 ▲吉▼重, 井関 清治, 上畑 雅司  独立行政法人産業技術総合研究所, 岡村製油株式会社  200903058296833553
• 特開2004-053701:記録表示媒体及びその製造方法  2004/02/19

  高橋 敦, 小泉 真一, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 共同印刷株式会社  200903013153971315
• 特開2003-261622:ジコレステリルジアセチレン誘導体  2003/09/19

  長沢 順一, 工藤 成史, 玉置 信之  独立行政法人産業技術総合研究所  200903058707427519
• 特開2003-261489:電荷移動錯体及びその作成方法  2003/09/16

  玉置 信之, 木戸脇匡俊  独立行政法人産業技術総合研究所  200903032032537507
• 特開2003-155357:光による水濡れ性制御型フイルム、及びその製法  2003/05/27

  秋山 陽久, 玉置 信之  独立行政法人産業技術総合研究所  200903055781967755
• 特開2003-118244:可逆性感熱記録用フィルム及び可逆性感熱記録媒体  2003/04/23

  寺井 智彦, 玉置 信之, 松田 宏雄  三菱樹脂株式会社, 独立行政法人産業技術総合研究所  200903005725878807
• 特開2003-096454:光感応性液晶性組成物を内包するマイクロカプセル、およびこのマイクロカプセルを含む可逆記録材料  2003/04/03

  青木 康幸, 玉置 信之, 松田 宏雄  王子製紙株式会社, 独立行政法人産業技術総合研究所  200903019389599288
• 特開2002-235085:コレステリック液晶及び記録表示材料  2002/08/23

  高橋 敦, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 共同印刷株式会社, 玉置 信之, 松田 宏雄  200903091157974581
• 特開2002-193995:ジコレステリルエステル及び記録表示材料  2002/07/10

  高橋 敦, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 共同印刷株式会社, 玉置 信之, 松田 宏雄  200903040340351689
• 特開2002-193994:ジコレステリルエステル化合物及び記録表示材料  2002/07/10

  高橋 敦, 玉置 信之, 松田 宏雄  独立行政法人産業技術総合研究所, 共同印刷株式会社, 玉置 信之, 松田 宏雄  200903080603443364
• 特開2002-127616:可逆記録材料  2002/05/08

  二村 恵朗, 杉本 浩之, 平野 成伸, 玉置 信之, 松田 宏雄, 木田 吉重  株式会社リコー, 玉置 信之, 松田 宏雄, 岡村製油株式会社, 独立行政法人産業技術総合研究所  200903085011298118
• 特開2002-127486:カラー画像記録方法および装置  2002/05/08

  平野 成伸, 杉本 浩之, 二村 恵朗, 玉置 信之, 松田 宏雄, 木田 吉重  株式会社リコー, 独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 岡村製油株式会社  200903058297434962
• 特開2002-080850:表示記録方法および表示記録装置  2002/03/22

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  株式会社リコー, 独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 岡村製油株式会社  200903072562020361
• 特開2002-023307:液晶性物質を用いた光情報記録方法  2002/01/23

  守山 雅也, 玉置 信之  独立行政法人産業技術総合研究所, 科学技術振興事業団, 玉置 信之  200903007606932421
• 特開2002-014313:可逆記録媒体および可逆記録方法  2002/01/18

  杉本 浩之, 二村 恵朗, 平野 成伸, 玉置 信之, 松田 宏雄, 木田 吉重  経済産業省産業技術総合研究所長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903064458101756
• 特開2002-011951:可逆記録媒体  2002/01/15

  平野 成伸, 二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  独立行政法人産業技術総合研究所, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903056310533875
• 特開2001-311930:可逆記録媒体、該可逆記録媒体を使用した記録方法および可逆記録装置  2001/11/09

  杉本 浩之, 二村 恵朗, 筒井 恭治, 玉置 信之, 松田 宏雄  経済産業省産業技術総合研究所長, 玉置 信之, 松田 宏雄, 株式会社リコー  200903087481300537
• 特開2001-290119:可逆記録材料および該可逆記録材料を用いた記録方法  2001/10/19

  青木 康幸, 玉置 信之, 松田 宏雄  王子製紙株式会社, 経済産業省産業技術総合研究所長, 玉置 信之, 松田 宏雄  200903099893014979
• 特開2001-261627:新規シッフ塩基誘導体、該誘導体の製造方法、該誘導体を含むフルカラー感熱記録材料及びフルカラー感熱記録媒体  2001/09/26

  玉置 信之, 松田 宏雄, 野崎 剛, タリマラ セシャデュリ, ハンス-ヤルゲン ハウト  経済産業省産業技術総合研究所長, 玉置 信之, ミノルタ株式会社, 松田 宏雄  200903051410250550
• 特開2001-260546:色純度を向上した可逆記録媒体、および可逆記録媒体  2001/09/25

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  経済産業省産業技術総合研究所長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903022690260084
• 特開2001-260545:カラー画像記録媒体  2001/09/25

  玉置 信之, 松田 宏雄, 野崎 剛, タリマラ セシャデュリ, ハンス-ヤルゲン ハウト  経済産業省産業技術総合研究所長, 玉置 信之, 松田 宏雄, ミノルタ株式会社  200903072799050850
• 特開2001-247598:ジコレステリルエステル化合物及び記録表示材料  2001/09/11

  高橋 敦, 玉置 信之, 松田 宏雄  経済産業省産業技術総合研究所長, 共同印刷株式会社, 玉置 信之, 松田 宏雄  200903091923064592
• 特開2001-233893:光感応部位を有する液晶性化合物、液晶添加剤及び光記録媒体  2001/08/28

  玉置 信之, 松田 宏雄, 守山 雅也  経済産業省産業技術総合研究所長, 科学技術振興事業団, 玉置 信之, 松田 宏雄  200903060274678567
• 特開2001-228453:多色記録用光記録媒体および光記録装置  2001/08/24

  杉本 浩之, 二村 恵朗, 豊島 伸朗, 玉置 信之, 松田 宏雄  経済産業省産業技術総合研究所長, 玉置 信之, 松田 宏雄, 株式会社リコー  200903064890088043
• 特許第3203338号:旋光能を有しかつ干渉色を示す固体薄膜の形成方法、その固体薄膜及びカラー記録材料  

  玉置 信之, 守山 雅也, 松田 宏雄  経済産業省産業技術総合研究所長, 玉置 信之, 松田 宏雄  201103014591517290
• 特開2001-164250:可逆記録材料  2001/06/19

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  経済産業省産業技術総合研究所長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903078929038112
• 特開2001-100170:多色画像記録方法および多色画像記録装置  2001/04/13

  杉本 浩之, 二村 恵朗, 玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903075607352378
• 特開2001-054983:可逆記録媒体、および該可逆記録媒体を使用した記録方法  2001/02/27

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903072684243604
• 特開2001-030637:可逆記録媒体、および該可逆記録媒体を使用した記録方法  2001/02/06

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903080899545175
• 特開2000-313172:可逆記録媒体、該可逆記録媒体を使用した記録方法および可逆記録装置  2000/11/14

  杉本 浩之, 二村 恵朗, 筒井 恭治, 玉置 信之, 松田 宏雄  工業技術院長, 株式会社リコー  200903094552314565
• 特開2000-298255:可逆記録媒体、および該可逆記録媒体を使用した記録方法  2000/10/24

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903059405650711
• 特開2000-251317:可逆記録媒体、および該可逆記録媒体を使用した記録方法  2000/09/14

  杉本 浩之, 二村 恵朗, 玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903032526546347
• 特開2000-247039:多色画像記録方法、および多色画像記録装置  2000/09/12

  杉本 浩之, 二村 恵朗, 玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903087722406722
• 特開2000-225772:可逆記録媒体、および該可逆記録媒体を使用した記録方法  2000/08/15

  杉本 浩之, 二村 恵朗, 玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903039033318960
• 特開2000-192044:可逆記録媒体、および該可逆記録媒体を使用した記録方法  2000/07/11

  二村 恵朗, 杉本 浩之, 玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 株式会社リコー, 玉置 信之, 松田 宏雄, 岡村製油株式会社  200903046221263702
• 特開2000-136384:旋光能を有しかつ干渉色を示す固体薄膜の形成方法、その固体薄膜及びカラー記録材料  2000/05/16

  玉置 信之, 守山 雅也, 松田 宏雄  工業技術院長, 玉置 信之, 松田 宏雄  200903056288316512
• 特開2000-089398:書き換え可能なカラー画像記録媒体及びそれを用いた光による画像形成方法  2000/03/31

  玉置 信之, 宋 小英, 松田 宏雄  工業技術院長, 玉置 信之, 松田 宏雄  200903008440774772
• 特開2000-075332:三次非線形光学材料及びジアセチレンエステル並びにその製造方法  2000/03/14

  玉置 信之, 松田 宏雄, 横尾 泰日児, 横沢 伊裕, 松本 幸男  工業技術院長, 玉置 信之, 松田 宏雄, 宇部興産株式会社  200903076868507774
• 特開2000-075331:光信号処理素子  2000/03/14

  玉置 信之, 松田 宏雄, 横沢 伊裕, 横尾 泰日児, 松本 幸男  工業技術院長, 玉置 信之, 松田 宏雄, 宇部興産株式会社  200903095496453952
• 特開2000-066174:表示記録方法および表示記録装置  2000/03/03

  玉置 信之, 松田 宏雄, 二村 恵朗, 杉本 浩之, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903060738518363
• 特開2000-053695:フルカラー感熱記録材料  2000/02/22

  玉置 信之, 松田 宏雄, 高橋 敦  工業技術院長, 玉置 信之, 松田 宏雄, 共同印刷株式会社  200903020618347407
• 特開2000-044592:フルカラー感熱記録材料  2000/02/15

  玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  200903044859886402
• 特許第3015815号:書き換え可能なカラー画像記録媒体及びそれを用いた光による画像形成方法  

  玉置 信之, 宋 小英, 松田 宏雄  工業技術院長, 玉置 信之, 松田 宏雄  201103098431482162
• 特開平11-323896:液状化対策構造及び液状化対策方法  1999/11/26

  玉置 克之, 風間 広志, 尾上 篤生, 三宅 紀治, 前田 信之, 吉見 吉昭  清水建設株式会社  200903051273526349
• 特許第2976012号:インターロック構造を有する高分子の製造方法  

  玉置 信之, 島田 悟  工業技術院長  201103002475295869
• 特許第2946042号:フルカラー感熱記録材料  

  玉置 信之, 松田 宏雄, 高橋 敦  工業技術院長, 玉置 信之, 松田 宏雄, 共同印刷株式会社  201103053237636899
• 特許第2936137号:フルカラー感熱記録材料  

  玉置 信之, 松田 宏雄, 木田 吉重  工業技術院長, 玉置 信之, 松田 宏雄, 株式会社リコー, 岡村製油株式会社  201103040162131600
• 特開平11-024027:書き換え可能なカラー画像記録媒体及びそれを用いた画像形成方法  1999/01/29

  玉置 信之, アレクサンダー パルフェノフ, 正木 篤, 松田 宏雄  工業技術院長, 玉置 信之, 松田 宏雄  200903012693459021
• 特許第2796608号:非線形光学材料  

  玉置 信之, 松田 宏雄, 関 隆広, 山岡 亜夫, 長谷川 寛  工業技術院長  201103074048562164
• 特許第2682972号:二官能性2-カテナン誘導体からなるインターロックトポリマー  

  島田 悟, 玉置 信之, 石川 啓一郎  工業技術院長  201103052151872216
• 特開平9-048849:二官能性2-カテナン誘導体からなるインターロックトポリマー  1997/02/18

  島田 悟, 玉置 信之, 石川 啓一郎  工業技術院長  200903028055610131
• 特開平9-048848:インターロック構造を有する高分子の製造方法  1997/02/18

  玉置 信之, 島田 悟  工業技術院長  200903028908326706
• 特開平8-069023:非線形光学材料  1996/03/12

  玉置 信之, 松田 宏雄, 関 隆広, 山岡 亜夫, 長谷川 寛  工業技術院長  200903033268470590
• 特開昭62-180359:光重合性組成物  1987/08/07

  玉置 信之, 今橋 聰  東洋紡績株式会社  201103095441604682

Awards & Honors

• 2001 化学バイオつくば賞
  

Research Grants & Projects

• 新世代分子スイッチによるＡＴＰシステムの完全制御

  日本学術振興会：科学研究費助成事業 基盤研究(B)

  Date (from‐to) : 2022/04 -2025/03 

  Author : 玉置 信之, 津田 真寿美
• Diriving motor proteins by photoisomerization reactions

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

  Date (from‐to) : 2018/04 -2021/03 

  Author : TAMAOKI NOBUYUKI

   

  We clarified the structure-activity relationship of photoresponsive high-energy compounds that drive motor proteins, and discovered compounds that distinguish and drive kinesin and myosin. We have synthesized a photoresponsive inhibitor to a motor protein that arranges chromosomes in the process of the cell cycle, and succeeded in photoswitching the arrangement of chromosomes in the cell. We synthesized a photoresponsive inhibitor that acts on dynein and succeeded in photocontrolling the movement of Chlamydomonas using flagella. Furthermore, we succeeded in replacing the retinal of the proton pump with an azobenzene derivative, and confirmed the photocycle and photoinduced proton transfer. We also succeeded in creating a completely artificial molecular system that converts light energy into continuous work in contrast to proteins.
• Development of a molecular function enabling one to take mechanical works from the piston-like molecular motion.

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

  Date (from‐to) : 2012/04 -2015/03 

  Author : TAMAOKI NOBUYUKI

   

  We aimed the development of a molecular function of a crank-shaft with which we can take the mechanical work out from the photochromic reaction (piston motion). We found out some photoresponsive chiral dopants for liquid crystals showing the change in a large helical twisting power upon photoirradiation. When some of them are doped, the motion of liquid crystal texture showed a hysteresis between forward and backward photoisomerization of the dopant by UV and visible irradiation, respectively. As the result we could attain a molecular crank-shaft function. We also developed some achiral compounds transformable to chiral form by the action of light. If we use a circular polarized light we obtained the chiral molecule with an enantio excess from the achiral compound. On the mechanism of the crank-shaft effect we explained the phenomenon with the contribution of a more disordered molecular alignment of the dopant upon backward photoisomerization.
• Reversible photoregulaton of microtubule dynamics and development of artificial bio-molecular machines

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

  Date (from‐to) : 2011 -2012 

  Author : FUKAMINATO Tsuyoshi, KAMEI Takashi, TAMAOKI Nobuyuki

   

  In this study, we tried to synthesize novel azobenzene derivatives, which can reversibly regulate the microtubule depolymerization-polymerization dynamics with external light stimuli, and attempted to develop artificial bio-molecular machines. For such purpose, we prepared several azobenzene derivatives having different kinds of substituent with different positions and rigorously investigated the effect on the microtubule polymerization dynamics. From detailed investigations, it was revealed that the amphiphilic structure of azobenzene was essential to achieve the reversible photoregulation of microtubule polymerization dynamics.
• Glass-forming chiral liquid crystals with white light emission and their tunable laser applications

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

  Date (from‐to) : 2010 -2011 

  Author : FURUMI Seiichi, TAMAOKI Nobuyuki

   

  This research project aims at the molecular design and synthesis of glass-forming chiral liquid crystals(G-CLCs) with white light emission, leading to tunable laser action on the basis of the photonic band effect of G-CLCs. Such G-CLCs are prepared by utilizing energy transfer, and the gradation structure of Bragg reflection is fabricated into the highly aligned G-CLC films by super-cooling process. We will demonstrate the tunable lasing in a fully visible wavelength range through our original optical measurement system.
• フォトクロミズムの攻究とメカニカル機能の創出

  科学研究費補助金

  Date (from‐to) : 2007 -2011 

  光駆動の分子機械を創成するための基盤研究 （計画研究代表者）
• Basic study for the synthesis of photo-driven molecular machines

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas

  Date (from‐to) : 2007 -2010 

  Author : TAMAOKI Nobuyuki, AKIYAMA Haruhisa

   

  We investigated the possibility of photo-control of the action or the speed in synthetic or biological molecular machines. In the synthetic molecular machines we synthesized compounds cyclically connected a photoisomerizable azobenzene and an aromatic ring as a rotor unit via spacers. By tuning the spacer lengths and the bulkiness of the rotor unit, it is for the first time accomplished to demonstrate the complete ON-OFF switching of the intra-molecular rotation of the rotor by the action of lights. In the kinesin/microtubuline system as one of motor proteins, it was demonstrated that reversible photo-regulations of the motility velocity were possible by the introduction of azobenzene moiety on surface of the substrate, in an inhibitor, or in the ATP structure.
• 水素結合による分子組織体を経由するナノワイヤー形成の動的制御

  日本学術振興会：科学研究費助成事業 特定領域研究

  Date (from‐to) : 2002 -2003 

  Author : 玉置 信之, 長沢 順一

   

  二つのコレステロール部と一つのジアセチレン部が二つづつのアルキレン鎖とウレタン結合でつながった構造の重合性有機ゲル化剤について分子構造とゲル化のおよび光重合性の関係について調べた。ゲル化を起こし光重合するために少なくともコレステリル基が1つあること、ウレタン部位が2つあることが必要条件であることが判明した。また、スペーサー部位の構造を変化させることでエタノールのような極性溶媒中でゲル化を起こす化合物が得られた。ゲルの構造については赤外スペクトル、透過型電子顕微鏡により、光重合性については核磁気共鳴スペクトル、重合度測定により解析を進めた。その結果、ゲル中ではウレタン結合は完全に水素結合していること、ゲルは10〜100nm程度の幅を有する細長いファイバー状分子集合体からなっていること、光重合はジアセチレン部が1,4位で付加して起こっていること、平均重合度は50程度であることが判明した。また、10〜15テスラの磁場下でゲル化し、その後重合することで配向した共役ポリマーのゲルが生成することが初めて明らかになった。
• Synthesis and characterization of light-driven molecular machine

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• 2017年10月1日 

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  2019年9月30日 

  電子科学研究所附属グリーンナノテクノロジー研究センター長