Researcher basic information

• 博士（材料科学）, 北陸先端科学技術大学院大学

• https://researchmap.jp/scb?lang=en

• 201301036245325580

• ホスト・ゲスト
• 光応答
• 金属クラスター
• 形状制御
• 電子構造解析

• Nanotechnology/Materials, Functional solid state chemistry
• Nanotechnology/Materials, Nanometer-scale chemistry
• Nanotechnology/Materials, Fundamental physical chemistry

• Bachelor's degree program, School of Science
• Master's degree program, Graduate School of Environmental Science
• Doctoral (PhD) degree program, Graduate School of Environmental Science

Research activity information

• Mar. 2017, 日本化学会, 第31回 若い世代の特別講演会
  七分勇勝
• Feb. 2016, 北海道大学, 研究総長賞(奨励賞)
  七分勇勝
• Jan. 2015, 日本化学会北海道支部, 奨励賞
  七分勇勝

• Controlled nanocrystallization of gold nanoclusters within surfactant envelopes: enhancing aggregation-induced emission in solution
  Yuki Saito; Ayano Suda; Maki Sakai; Shogo Nakajima; Yukatsu Shichibu; Hayato Kanai; Yasuhiro Ishida; Katsuaki Konishi
  Chemical Science, 15, 30, 11775, 11782, Royal Society of Chemistry (RSC), 2024
  Scientific journal, Sphere-shaped amorphous aggregates of Au₈ clusters entrapped within SDS nanoenvelopes are transformed into rhombic single nanocrystals upon simple sonication in solution, where the aggregation-induced emission (AIE) from Au₈ is notably enhanced.
• Molecular ordering-enhanced circularly polarized luminescence of chiral 1,10-phenanthroline derivatives
  Masayoshi Bando; Mariagrazia Fortino; Adriana Pietropaolo; Yukatsu Shichibu; Katsuaki Konishi; Tamaki Nakano
  Chemical Communications, 60, 65, 8625, 8628, Royal Society of Chemistry (RSC), 2024
  Scientific journal, A chiral Phen derivative shows remarkable circularly polarized luminescence based on molecular ordering in the solid state but not in solution, indicating the importance of designing intermolecular alignment, not just single molecular dissymmetry.
• The synthesis and enhanced thermal-optical properties of nanocomposites fabricated from gold nanoclusters ([Au₂₅(SC₁₂H₂₅)₁₈]TOA) and non-linear S-shaped liquid crystalline materials
  Pui-Wing Yap; Guan-Yeow Yeap; Yuki Saito; Xiao-Yu Hu; Yukatsu Shichibu; Katsuaki Konishi
  New Journal of Chemistry, 48, 2, 738, 746, Royal Society of Chemistry (RSC), 2024
  Scientific journal, A series of new gold nanocomposite materials, GNC_LCx (x = 6–11) derived from the non-linear liquid crystal oligomers, LCx (x = 6–11) and a gold nanocluster (GNC) possessing a formulation of [Au₂₅(SC₁₂H₂₅)₁₈]TOA or Au₂₅.
• Collective Effects of Multiple Fluorine Atoms Causing π‐philic Characteristic within a Caged Polyoxometalate Framework
  Chinatsu Murata; Akari Nakashuku; Yukatsu Shichibu; Katsuaki Konishi
  Chemistry – A European Journal, 30, 4, Wiley, 29 Nov. 2023
  Scientific journal, Abstract
  
  Perfluorination brings about distinctive properties arising from the unusual nature of the F element, which have been extensively developed in materials science and chemistry. Herein we report that the construction of F‐rich inner space within a hollowed Mo₁₃₂O₃₇₂ cage ([Mo₁₃₂O₃₇₂(OCOR)₃₀(H₂O)₇₂]⁴²⁻) leads to the emergence of unique guest binding activities in encapsulation. Prominently, the trifluoroacetate‐modified cage (R=CF₃, 2) having as many as 90 F groups inside favors trapping cyclopentadiene (Cp), which is hardly trapped by the non‐fluorinated counterpart (R=CH₃, 1). Systematic studies using related hydrocarbons show that the amount of the encapsulated guest is correlated with the unsaturation degree of the guests, implying the involvement of the attractive interaction of the CF₃‐modified interior wall with the guest π‐electron clouds. Control experiments using the semi‐fluorinated analogues (R=CF₂H, CFH₂) reveal that the perfluorination is a critical factor to facilitate the Cp encapsulation by 2, indicating that collective effects of polar C−F bonds spreading over the interior surface, rather than the polarity of the individual C−F bonds, are responsible. We also provide a successful example of the physical molecular confinement within the cage through the “ship‐in‐a‐bottle” Diels‐Alder reaction between trapped diene and dienophile.
• In situ Microinflammation Detection Using Gold Nanoclusters and a Tissue-clearing Method.
  Fayrouz Naim; Rie Hasebe; Shintaro Hojyo; Yukatsu Shichibu; Asuka Ishii; Yuki Tanaka; Kazuki Tainaka; Shimpei I Kubota; Katsuaki Konishi; Masaaki Murakami
  Bio-protocol, 13, 7, e4644, 05 Apr. 2023, [International Magazine]
  English, Scientific journal, Microinflammation enhances the permeability of specific blood vessel sites through an elevation of local inflammatory mediators, such as interleukin (IL)-6 and tumor necrosis factor (TNF)-α. By a two-dimensional immunohistochemistry analysis of tissue sections from mice with experimental autoimmune encephalomyelitis (EAE), an animal model for multiple sclerosis (MS), we previously showed that pathogenic immune cells, including CD4+ T cells, specifically accumulate and cause microinflammation at the dorsal vessels of the fifth lumbar cord (L5), resulting in the onset of disease. However, usual pathological analyses by using immunohistochemistry on sections are not effective at identifying the microinflammation sites in organs. Here, we developed a new three-dimensional visualization method of microinflammation using luminescent gold nanoclusters (AuNCs) and the clear, unobstructed brain/body imaging cocktails and computational analysis (CUBIC) tissue-clearing method. Our protocol is based on the detection of leaked AuNCs from the blood vessels due to an enhanced vascular permeability caused by the microinflammation. When we injected ultrasmall coordinated Au13 nanoclusters intravenously (i.v.) to EAE mice, and then subjected the spinal cords to tissue clearing, we detected Au signals leaked from the blood vessels at L5 by light sheet microscopy, which enabled the visualization of complex tissue structures at the whole organ level, consistent with our previous report that microinflammation occurs specifically at this site. Our method will be useful to specify and track the stepwise development of microinflammation in whole organs that is triggered by the recruitment of pathogenic immune cells at specific blood vessels in various inflammatory diseases.
• IrAu₁₂ superatom modified by chiral diphosphines: doping-induced enhancement of chiroptical activity
  Haru Hirai; Takuya Nakashima; Shinjiro Takano; Yukatsu Shichibu; Katusaki Konishi; TSUYOSHI KAWAI; Tatsuya Tsukuda
  Journal of Materials Chemistry C, 11, 8, 3095, 3100, Royal Society of Chemistry ({RSC}), 2023
  English, Scientific journal, Chiroptical activities of Au13 superatom modified with chiral ligands were enhanced by doping of an Ir atom at the center of the core. The IrAu12 superatom exhibited the brighter circularly polarized luminescence than Au13 superatom.
• Ligand-coordinated metal clusters in condensed states: Self-assemblies, crystals, and covalent networks
  Yuki Saito; Chinatsu Murata; Mizuho Sugiuchi; Yukatsu Shichibu; Katsuaki Konishi
  Coordination Chemistry Reviews, 470, 214713, 214713, Elsevier BV, Nov. 2022
  Scientific journal
• Chiral Gold Clusters with Crosslinking Ligands: Geometric Structures and Chiroptical Activities
  Yukatsu Shichibu; Katsuaki Konishi
  ChemNanoMat, 8, 8, Wiley, Aug. 2022
  Scientific journal
• Catalytic Synthesis of Oxazolidinones from a Chitin-Derived Sugar Alcohol
  Takuya Sagawa; Hirokazu Kobayashi; Chinatsu Murata; Yukatsu Shichibu; Katsuaki Konishi; Mineo Hashizume; Atsushi Fukuoka
  Bulletin of the Chemical Society of Japan, 95, 7, 1054, 1059, The Chemical Society of Japan, 27 May 2022
  Scientific journal
• Aggregation-induced chirality amplification of optically active fluorescent polyurethane and a cyclic dimer in the ground and excited states
  Zhiyi Song; Hiroyasu Sato; Adriana Pietropaolo; Qingyu Wang; Shuhei Shimoda; Heshuang Dai; Yoshitane Imai; Hayato Toda; Takunori Harada; Yukatsu Shichibu; Katsuaki Konishi; Masayoshi Bando; Naofumi Naga; Tamaki Nakano
  CHEMICAL COMMUNICATIONS, 58, 7, 1029, 1032, Jan. 2022
  English, Scientific journal
• Diarsine- vs diphosphine-protected Au13 clusters: Effect of subtle geometric differences on optical property and electronic structure
  Yukatsu Shichibu; Fan Zhang; Yuxiang Chen; Masafumi Konishi; Susumu Tanaka; Hiroaki Imoto; Kensuke Naka; Katsuaki Konishi
  The Journal of Chemical Physics, 155, 5, 054301, 054301, AIP Publishing, 07 Aug. 2021, [Peer-reviewed]
  Scientific journal
• Self-promoted solid-state covalent networking of Au25(SR)18 through reversible disulfide bonds. A critical effect of the nanocluster in oxidation processes
  Yuki Saito; Yukatsu Shichibu; Katsuaki Konishi
  Nanoscale, 13, 22, 9971, 9977, Royal Society of Chemistry (RSC), Jun. 2021, [Peer-reviewed]
  Scientific journal,

  Covalent crosslinking of Au₂₅(SR)₁₈ nanoclusters through reversible disulfide bond formation, which was promoted by the Au₂₅ nanocluster itself, occurred under the control of dynamic covalent chemistry, affording free-standing nanocluster films.

• A Triad Fluorenone Derivative Bearing Two Imidazole Groups That Switches between Three States by Base and Acid Stimuli
  Yuting Wang; Nabin Maity; Liming Zhao; Maximilian Krämer; Jun-ya Hasegawa; Yukatsu Shichibu; Katsuaki Konishi; Xiaoyuan Wang; Zhiyi Song; Masayoshi Bando; Tamaki Nakano
  Chemistry Letters, 50, 7, 1363, 1367, The Chemical Society of Japan, 15 Apr. 2021, [Peer-reviewed]
  Scientific journal
• Chiroptical activity of Au13 clusters: experimental and theoretical understanding of the origin of helical charge movements
  Yukatsu Shichibu; Yuri Ogawa; Mizuho Sugiuchi; Katsuaki Konishi
  Nanoscale Advances, 3, 4, 1005, 1011, Royal Society of Chemistry (RSC), Mar. 2021, [Peer-reviewed]
  Scientific journal,

  The profound chiroptical nature of Au₁₃ clusters was revealed from systematic experimental and theoretical investigations.

• Terahertz Raman Spectroscopy of Ligand-Protected Au8 Clusters
  Masaru Kato; Yukatsu Shichibu; Kazuya Ogura; Mitsuhiro Iwasaki; Mizuho Sugiuchi; Katsuaki Konishi; Ichizo Yagi
  The Journal of Physical Chemistry Letters, 11, 19, 7996, 8001, American Chemical Society (ACS), 01 Oct. 2020, [Peer-reviewed]
  Scientific journal
• Aggregation-Mode-Dependent Optical Properties of Cationic Gold Clusters: Formation of Ordered Assemblies in Solution and Unique Optical Responses
  Mizuho Sugiuchi; Mingzhe Zhang; Yusaku Hakoishi; Yukatsu Shichibu; Noriko Nishizawa Horimoto; Yoshihiro Yamauchi; Yasuhiro Ishida; Katsuaki Konishi
  The Journal of Physical Chemistry C, 124, 29, 16209, 16215, American Chemical Society (ACS), 23 Jul. 2020, [Peer-reviewed]
  Scientific journal
• Synthesis and stereochemistry of helical polyurethanes based on 2,2 '-dihydroxy-1,1 '-binaphthyl and diisocyanatobenzenes
  Heshuang Dai; Yukatsu Shichibu; Yoshitane Imai; Nobuyuki Hara; Katsuaki Konishi; Yue Wang; Zhiyi Song; Tamaki Nakano
  POLYMER CHEMISTRY, 11, 6, 1134, 1144, Feb. 2020, [Peer-reviewed]
  English, Scientific journal
• Biicosahedral gold clusters [Au25(PPh3)10(SCnH2n+1)5Cl2]2+(n ) 2-18): A stepping stone to cluster-assembled materials
  Yukatsu Shichibu; Yuichi Negishi; Takahito Watanabe; Nirmalya K. Chaki; Hiroyuki Kawaguchi; Tatsuya Tsukuda
  Journal of Physical Chemistry C, 111, 22, 7845, 7847, American Chemical Society, 2020
  English, Scientific journal
• Photoluminescence Properties of [Core+ exo]-Type Au6 Clusters: Insights into the Effect of Ligand Environments on the Excitation Dynamics
  Yukatsu Shichibu; Mingzhe Zhang; Takeshi Iwasa; Yuriko Ono; Tetsuya Taketsugu; Shun Omagari; Takayuki Nakanishi; Yasuchika Hasegawa; Katsuaki Konishi
  Journal of Physical Chemistry C, 123, 11, 6934, 6939, 21 Mar. 2019, [Peer-reviewed]
  Scientific journal
• Unusual Attractive Au–π Interactions in Small Diacetylene-Modified Gold Clusters
  Mitsuhiro Iwasaki; Yukatsu Shichibu; Katsuaki Konishi
  Angewandte Chemie - International Edition, 58, 8, 2443, 2447, Wiley-VCH Verlag, 18 Feb. 2019
  English, Scientific journal
• Catalytic Conversion of a Chitin-Derived Sugar Alcohol to an Amide-Containing Isosorbide Analog
  Takuya Sagawa; Hirokazu Kobayashi; Chinatsu Murata; Yukatsu Shichibu; Katsuaki Konishi; Atsushi Fukuoka
  ACS Sustainable Chemistry & Engineering, 7, 17, 14883, 14888, American Chemical Society (ACS), 2019, [Peer-reviewed]
  Scientific journal
• Unusual Attractive Au-pi Interactions in Small Diacetylene-Modified Gold Clusters
  Mitsuhiro Iwasaki; Yukatsu Shichibu; Katsuaki Konishi
  Angewandte Chemie International Edition, 58, 8, 2443, 2447, 2019, [Peer-reviewed]
• An Inherently Chiral Au24 Framework with Double-Helical Hexagold Strands
  Mizuho Sugiuchi; Yukatsu Shichibu; Katsuaki Konishi
  Angewandte Chemie - International Edition, 57, 26, 7855, 7859, Wiley-VCH Verlag, 25 Jun. 2018, [Peer-reviewed]
  English, Scientific journal
• Phosphine-Ligated Gold Clusters with Core+exo Geometries: Unique Properties and Interactions at the Ligand–Cluster Interface
  Katsuaki Konishi; Mitsuhiro Iwasaki; Yukatsu Shichibu
  Accounts of Chemical Research, 51, 3125, 3133, 2018, [Peer-reviewed]
• Preparation of Carbodiimides with One-Handed Axial Chirality
  Tohru Taniguchi; Takahiro Suzuki; Haruka Satoh; Yukatsu Shichibu; Katsuaki Konishi; Kenji Monde
  Journal of the American Chemical Society, 140, 15577, 15581, 2018, [Peer-reviewed]
• Hydrogen bonds to Au atoms in coordinated gold clusters
  Md. Abu Bakar; Mizuho Sugiuchi; Mitsuhiro Iwasaki; Yukatsu Shichibu; Katsuaki Konishi
  NATURE COMMUNICATIONS, 8, 576, Sep. 2017, [Peer-reviewed]
  English, Scientific journal
• Ligand-Based Toolboxes for Tuning of the Optical Properties of Subnanometer Gold Clusters
  Katsuaki Konishi; Mitsuhiro Iwasaki; Mizuho Sugiuchi; Yukatsu Shichibu
  JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 7, 21, 4267, 4274, Nov. 2016, [Peer-reviewed]
  English, Scientific journal
• Hexanuclear Platinum(II) Thiolate Macrocyclic Host: Charge-Transfer-Driven Inclusion of a Ag-I Ion Guest
  Yukatsu Shichibu; Keisuke Yoshida; Katsuaki Konishi
  INORGANIC CHEMISTRY, 55, 18, 9147, 9149, Sep. 2016, [Peer-reviewed]
  English, Scientific journal
• Facile modulation of optical properties of octagold clusters through the control of ligand-mediated interactions
  Mitsuhiro Iwasaki; Naoki Kobayashi; Yukatsu Shichibu; Katsuaki Konishi
  PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 28, 19433, 19439, Jul. 2016, [Peer-reviewed]
  English, Scientific journal
• Facile Diastereoseparation of Glycosyl Sulfoxides by Chiral Stationary Phase
  Tohru Taniguchi; Mai Asahata; Akihito Nasu; Yukatsu Shichibu; Katsuaki Konishi; Kenji Monde
  CHIRALITY, 28, 7, 534, 539, Jul. 2016, [Peer-reviewed]
  English, Scientific journal
• Chiral Polyurethane Synthesis Leading to pi-Stacked 2/1-Helical Polymer and Cyclic Compounds
  Prashant G. Gudeangadi; Takeshi Sakamoto; Yukatsu Shichibu; Katsuaki Konishi; Tamaki Nakano
  ACS MACRO LETTERS, 4, 9, 901, 906, Sep. 2015, [Peer-reviewed]
  English, Scientific journal
• Impact of Skeletal Isomerization of Ultrasmall Gold Clusters on Electrochemical Properties: Voltammetric Profiles of Nonspoked Octanuclear Clusters.
  Yutaro Kamei; Neil Robertson; Yukatsu Shichibu; Katsuaki Konishi
  JOURNAL OF PHYSICAL CHEMISTRY C, 119, 20, 10995, 10999, May 2015, [Peer-reviewed]
  English, Scientific journal
• Cluster-pi electronic interaction in a superatomic Au-13 cluster bearing sigma-bonded acetylide ligands
  Mizuho Sugiuchi; Yukatsu Shichibu; Takayuki Nakanishi; Yasuchika Hasegawa; Katsuaki Konishi
  CHEMICAL COMMUNICATIONS, 51, 70, 13519, 13522, 2015, [Peer-reviewed]
  English, Scientific journal
• [Au-7](3+): A Missing Link in the Four-Electron Gold Cluster Family
  Yukatsu Shichibu; Mingzhe Zhang; Yutaro Kamei; Katsuaki Konishi
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 136, 37, 12892, 12895, Sep. 2014, [Peer-reviewed]
  English, Scientific journal
• Protonation-Induced Chromism of Pyridylethynyl-Appended [core plus exo]-Type Au-8 Clusters. Resonance-Coupled Electronic Perturbation through pi-Conjugated Group
  Naoki Kobayashi; Yutaro Kamei; Yukatsu Shichibu; Katsuaki Konishi
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 135, 43, 16078, 16081, Oct. 2013, [Peer-reviewed]
  English, Scientific journal
• Electronic Properties of [Core plus exo]-type Gold Clusters: Factors Affecting the Unique Optical Transitions
  Yukatsu Shichibu; Katsuaki Konishi
  INORGANIC CHEMISTRY, 52, 11, 6570, 6575, Jun. 2013, [Peer-reviewed]
  English, Scientific journal
• Unique [core plus two] structure and optical property of a dodeca-ligated undecagold cluster: critical contribution of the exo gold atoms to the electronic structure
  Yukatsu Shichibu; Yutaro Kamei; Katsuaki Konishi
  CHEMICAL COMMUNICATIONS, 48, 61, 7559, 7561, 2012, [Peer-reviewed]
  English, Scientific journal
• Facile synthesis and optical properties of magic-number Au-13 clusters
  Yukatsu Shichibu; Kai Suzuki; Katsuaki Konishi
  NANOSCALE, 4, 14, 4125, 4129, 2012, [Peer-reviewed]
  English, Scientific journal
• A Photo-Degradable Helix: Synthesis, Structure, and Photolysis of Optically Active Poly[2,7-bis(4-t-butylphenyl)-9-methylfluoren-9-yl Acrylate]
  Takeshi Sakamoto; Kento Watanabe; Yukatsu Shichibu; Katsuaki Konishi; Shin-Ichiro Sato; Tamaki Nakano
  JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 49, 4, 945, 956, Feb. 2011, [Peer-reviewed]
  English, Scientific journal
• Generation of Small Gold Clusters with Unique Geometries through Cluster-to-Cluster Transformations: Octanuclear Clusters with Edge-sharing Gold Tetrahedron Motifs
  Yutaro Kamei; Yukatsu Shichibu; Katsuaki Konishi
  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 50, 32, 7442, 7445, 2011, [Peer-reviewed]
  English, Scientific journal
• HCl-Induced Nuclearity Convergence in Diphosphine-Protected Ultrasmall Gold Clusters: A Novel Synthetic Route to "Magic-Number" Au-13 Clusters
  Yukatsu Shichibu; Katsuaki Konishi
  SMALL, 6, 11, 1216, 1220, Jun. 2010, [Peer-reviewed]
  English, Scientific journal
• Ubiquitous 8 and 29 kDa gold: Alkanethiolate cluster compounds: Mass-spectrometric determination of molecular formulas and structural implications
  Nirmalya K. Chaki; Yuichi Negishi; Hironori Tsunoyama; Yukatsu Shichibu; Tatsuya Tsukuda
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 130, 27, 8608, +, Jul. 2008, [Peer-reviewed]
  English, Scientific journal
• Origin of magic stability of thiolated gold clusters: A case study on Au-25(SC6H13)(18)
  Yuichi Negishi; Nirmalya K. Chaki; Yukatsu Shichibu; Robert L. Whetten; Tatsuya Tsukuda
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 129, 37, 11322, +, Aug. 2007, [Peer-reviewed]
  English, Scientific journal
• Biicosahedral gold clusters [Au-25(PPh3)(10)(SCnH2n+1)(5)Cl-2](2+) (n=2-18): A stepping stone to cluster-assembled materials
  Yukatsu Shichibu; Yuichi Negishi; Takahito Watanabe; Nirmalya K. Chaki; Hiroyuki Kawaguchi; Tatsuya Tsukuda
  JOURNAL OF PHYSICAL CHEMISTRY C, 111, 22, 7845, 7847, Jun. 2007, [Peer-reviewed]
  English
• Extremely high stability of glutathionate-protected Au-25 clusters against core etching
  Yukatsu Shichibu; Yuichi Negishi; Hironori Tsunoyama; Masayuki Kanehara; Toshiharu Teranishi; Tatsuya Tsukuda
  SMALL, 3, 5, 835, 839, May 2007, [Peer-reviewed]
  English, Scientific journal
• Tunneling resistance of double-barrier tunneling structures with an alkanethiol-protected Au nanoparticle
  H Zhang; Y Yasutake; Y Shichibu; T Teranishi; Y Majima
  PHYSICAL REVIEW B, 72, 20, Nov. 2005, [Peer-reviewed]
  English, Scientific journal
• Large-scale synthesis of thiolated Au-25 clusters via ligand exchange reactions of phosphine-stabilized Au-11 clusters
  Y Shichibu; Y Negishi; T Tsukuda; T Teranishi
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 127, 39, 13464, 13465, Oct. 2005, [Peer-reviewed]
  English, Scientific journal
• Ab initio study on electronic structures of pentacene molecular crystals with dopants
  Y Shichibu; K Watanabe
  JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 42, 9A, 5472, 5476, Sep. 2003, [Peer-reviewed]
  English, Scientific journal
• Ab initio study on surface segregation of hydrogen from diamond C(100) surfaces
  C. Kanai; Y. Shichibu; K. Watanabe; K. Watanabe; Y. Takakuwa
  Physical Review B - Condensed Matter and Materials Physics, 65, 15, 1533121, 1533124, 15 Apr. 2002
  English, Scientific journal
• Ab initio study on surface segregation of hydrogen from diamond C(100) surfaces
  C Kanai; Y Shichibu; K Watanabe; Y Takakuwa
  PHYSICAL REVIEW B, 65, 15, Apr. 2002, [Peer-reviewed]
  English, Scientific journal

• Ligand-protected clusters
  Yukatsu Shichibu; Katsuaki Konishi, Atomic Clusters with Unusual Structure, Bonding and Reactivity, 411, 421, Oct. 2022
  Elsevier
• サブナノクラスター：配位化学に基づく時空間制御
  七分勇勝; 小西克明, フロンティアナノ金属錯体化学, 151, 167, Jul. 2022
• Shape-Regulated Gold Clusters and Their Optical Properties
  七分 勇勝; 小西 克明, 表面, 51, 8, 381, 385, Aug. 2013
  広信社, Japanese
• Ab initio study on electronic states of pentacene molecular crystals
  Shichibu Y.; Watanabe K., Meeting abstracts of the Physical Society of Japan, 58, 1, 802, 802, 06 Mar. 2003
  The Physical Society of Japan (JPS), Japanese

• ナノ環境材料化学特論Ⅱ, 2024年, 修士課程, 環境科学院
• 環境物質科学基礎論Ⅰ, 2024年, 修士課程, 環境科学院
• 化学Ⅰ, 2024年, 学士課程, 全学教育

• JAPAN SOCIETY FOR MOLECULAR SCIENCE
• THE CHEMICAL SOCIETY OF JAPAN

• Syntheses and properties of novel metal clusters via ligand-network formation
  Grants-in-Aid for Scientific Research
  01 Apr. 2019 - 31 Mar. 2022
  Yukatsu Shichibu
  In the design of ligand-protected metal clusters, the construction of surrounding ligand environments around metal cores is profoundly important. In this work, ligand-network formations and their effect on geometric and electronic structures of ligand-protected gold clusters were investigated. A visual understanding of the origin of helical charge movements was provided with transition-moment and transition-density analyses. In addition, slight structural differences in gold core geometries associated with the bridging unit of the ligands were found to be reflected in optical profiles.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 19H02532
• 単位・集積設計を基盤とする金サブナノクラスターのキラル化学
  科学研究費助成事業
  01 Apr. 2017 - 31 Mar. 2019
  七分 勇勝
  高い堅牢性と対称性を併せ持つ有機配位子保護金サブナノクラスターの幾何的・電子的な特性に着目し、本研究ではアキラルな有機配位子を用いて金サブナノクラスターの合成を行い、合成物の評価を行った。得られた金サブナノクラスターはラセミ混合物であったものの、キラルカラムクロマトグラフィーを用いて光学分割することから各エナンチオマーを得ることに成功し、円偏光二色性スペクトル測定により光学活性の評価を行った。そして、理論計算による電子構造解析を用いることで、金サブナノクラスターの幾何構造と光学活性の間の相関を明らかにした。また、種々のキラルな有機配位子を用いた場合においても特徴的な幾何・電子構造を持つ金サブナノクラスターの合成に成功し、円偏光二色性や円偏光発光特性を示すことが確認された。特に、金２４量体クラスターにおいては、固有キラリティーを有するヘリセンに類似した金コア骨格を見い出した。さらに、有機配位子の幾何的特徴が金コア骨格に与える影響に関する検討を行う過程で、金核数が共通であるものの配位子環境が僅かに異なる２種類の金サブナノクラスターを得た。それらの幾何構造と光学特性の評価を実験・理論の双方から行った結果、配位子環境の柔軟性が金サブナノクラスターの励起状態構造に大きな影響を与えることを実証した。今後有機配位子保護金サブナノクラスターのキラル化学展開がさらに進む中で、本研究での成果は重要な指針を与えるものと期待される。
  日本学術振興会, 新学術領域研究(研究領域提案型), 北海道大学, 17H05345
• Shape transformation and optical response of gold clusters using ligand clip method
  Grants-in-Aid for Scientific Research
  01 Apr. 2016 - 31 Mar. 2019
  Shichibu Yukatsu
  In this work, changes in geometric and electronic structures of ligand-protected gold clusters were investigated. Chain lengths of linker moieties of bidentate ligands affected structural adaptability of ligand environments, leading to differences in photoluminescence property. In addition, unique non-bonding interactions between gold cores and ligands of gold clusters were found.
  Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (A), Hokkaido University, 16H05961
• Synthesis of ultrasmall gold nanorod with a subnanometer-sized diameter and its optical property
  Grants-in-Aid for Scientific Research
  01 Apr. 2012 - 31 Mar. 2014
  SHICHIBU YUKATSU
  In this work, synthesis of ultrasmall gold nanorod with a subnamometer-sized diameter had been explored and a nobel gold nanorod with a pencil-like structure was obtained. This showed an intense absorption band in visible region and the correlation between the geometric structure and the absorption property was investigated both experimentally and theoretically.
  Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, 24750001

• Au13クラスタ及び金クラスタの製造方法
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