九州大学-研究者情報 [酒井健 (教授) 理学研究院化学部門]

酒井健（さかいけん）

データ更新日：2023.11.27

教授　／　理学研究院化学部門無機・分析化学講座

原著論文

1.	Jia-Wei Wang, Xian Zhang, Lucia Velasco, Michael Karnahl, Zizi Li, Zhi-Mei Luo, Yanjun Huang, Jin Yu, Wenhui Hu, Xiaoyi Zhang, Kosei Yamauchi, Ken Sakai, Dooshaye Moonshiram, and Gangfeng Ouyang, Precious-Metal-Free CO₂ Photoreduction Boosted by Dynamic Coordinative Interaction between Pyridine-Tethered Cu(I) Sensitizers and a Co(II) Catalyst, Journal of the American Chemical Society, 2023.07.
2.	Natsuki Taira, Kosei Yamauchi, and Ken Sakai, Intracluster O-O Coupling Pathway Evidenced for an Anderson-type Single-Cobalt Polymolybdate Water Oxidation Catalyst, ACS Catalysis, 10.1021/acscatal.2c05925, 13, 3211-3223, 2023.02, 本研究では最小分子量のポリオキソメタレート (POM) 型高活性酸素発生触媒である単核コバルトポリモリブデン酸 (Co-POM-Mo) に着目し、詳細な反応機構解析によって酸素発生反応の律速段階が分子内O-O結合形成過程 (i-I2M) によって進行することを明らかにした。また、POM骨格内にあらかじめ存在する架橋酸素原子間のO-O結合形成に基づく新たな反応機構であることを見出した。.
3.	Hironobu Ozawa, Ryoma Kikunaga, Hajime Suzuki, Ryu Abe, and Ken Sakai, Efficient syngas production with controllable CO:H2 ratios based on the aqueous electrocatalytic CO₂ reduction over mesoporous TiO2 films modified with a cobalt porphyrin molecular catalyst, Sustainable Energy ＆ Fuels, 10.1039/D2SE01595A, 7, 1627-1632, 2023.02.
4.	Fumika Sueyoshi, Xian Zhang, Kosei Yamauchi, and Ken Sakai, Controlling the Photofunctionality of a Polyanionic Heteroleptic Copper(I) Photosensitizer for CO₂ Reduction Using Its Ion-pair Formation with Polycationic Ammonium in Aqueous Media, Angewandte Chemie, 10.1002/anie.202217807, 9, 62, 2023.02.
5.	Keita Kuge, Kosei Yamauchi and Ken Sakai, Theoretical Study on the Mechanism of Hydrogen Evolution Reaction Catalyzed by Platinum Subnanoclusters, Dalton Transactions, 10.1039/D2DT02645G, 3, 52, 583-597, 2022.11.
6.	Arnau Call, Mihaela Cibian, Kosei Yamauchi and Ken Sakai, Visible-Light-Driven Reduction of CO2 to CO in Fully Aqueous Media using a Water-Soluble Cobalt Porphyrin, Sustainable Energy Fuels, doi.org/10.1039/D2SE00291D, 9, 2160-2164, 2022.04.
7.	Hironobu Ozawa, Ken Sakai, Two-Electrode Solar Water Splitting Permitting H₂ Separation at a Dark Cathode, AsiaChem Magazine, 10.51167/acm00027, 2, 1, 80-87, 2021.12.
8.	Yuto Sakaguchi, Arnau Call, Kosei Yamauchi, and Ken Sakai, Catalysis of CO₂ reduction by diazapyridinophane complexes of Fe, Co, and Ni: CO₂ binding triggered by combined frontier MO associations involving a SOMO, Dalton Transactions, 10.1039/D1DT01877A, 44, 50, 15983-15995, 2021.08.
9.	Xian Zhang, Kosei Yamauchi, and Ken Sakai, Earth-Abundant Photocatalytic CO₂ Reduction by Multielectron Chargeable Cobalt Porphyrin Catalysts: High CO/H_{2_{Selectivity in Water Based on Phase Mismatch in Frontier MO Association, ACS Catalysis, 10.1021/acscatal.1c02475, 11, 16, 10436-10449, 2021.08, 新規二酸化炭素還元コバルトポルフィリン錯体触媒（CoP）の開発し、銅増感剤（CuPS）と組み合わせることで水溶液系においても優れた二酸化炭素還元選択性（90%）を示すことを明らかにした。その要因について、量子化学計算を行い検証したところ、本錯体触媒は配位子中心の多電子還元過程を駆動するものの、中心金属はCo(II)状態を維持し、低原子価Co(I)種を形成せずに二酸化炭素を活性化することが示された。それに伴い、位相が整合するCo(II)種と二酸化炭素の活性化が促進された一方、位相が整合することからCo(I)中間種では促進される水素イオンの活性化が抑制されたことが示された。.}}
10.	＃Koichi Yatsuzuka, ＠Kosei Yamauchi, and ＠Ken Sakai, Redox tuning in Pt(bpy)-viologen catalyst-acceptor dyads enabling photocatalytic hydrogen evolution from water, Chemical Communications, 10.1039/D1CC00903F, 57, 42, 5183-5186, 2021.04.
11.	Koichi Yatsuzuka, Kosei Yamauchi, Ken Kawano, Hironobu Ozawa, and Ken Sakai, Improving the Overall Performance of Photochemical H₂Evolution Catalyzed by the Co-NHC Complex via the Redox Tuning of Electron Relays, Sustainable Energy Fuels, 10.1039/D0SE01597K, 5, 740-749, 2021.02.
12.	Hoda A. El-Ghamry, Kosei Yamauchi, Ken Sakai, and Thoraya A. Farghaly, Unexpected structure of enaminone Pd(II) complex in comparison with Cu(II)complex: Synthesis, characterization, DNA binding and antitumor activity, Inorganica Chimica Acta, 10.1016/j.ica.2020.120117, 1, 516 , 120117, 2020.11.
13.	Katsuhiro Akamine, Kohei Morita, Ken Sakai, and Hironobu Ozawa, A Molecular-Based Water Electrolyzer Consisting of Two Mesoporous TiO2 Electrodes Modified with Metalloporphyrin Molecular Catalysts Showing a Quantitative Faradaic Efficiency, ACS Applied Energy Materials, 10.1021/acsaem.0c00443, 3, 5, 4860-4866, 2020.04, [URL], 酸素生成錯体触媒を修飾した二酸化チタン電極、および水素生成錯体触媒を修飾した二酸化チタン電極を作製し、それぞれの触媒機能評価を行った。さらに、これらの修飾電極を用いた分子性電気化学セルによる水の完全分解に初めて成功した。.
14.	Tomohiko Hamaguchi, Keisuke Kai, Isao Ando, Ken Kawano, Kosei Yamauchi, and Ken Sakai, A dinuclear nickel catalyst based on metal–metal cooperation for electrochemical hydrogen production, Inorganica Chimica Acta, 10.1016/j.ica.2020.119498, 505, 119498-119503, 2020.05.
15.	＃Xian Zhang, Mihaela Cibian,＠Arnau Call, ＠Kosei Yamauchi,and Ken Sakai, Photochemical CO₂ Reduction Driven by Water-Soluble Copper(I) Photosensitizer with the Catalysis Accelerated by Multi-Electron Chargeable Cobalt Porphyrin, ACS Catalysis, https://doi.org/10.1021/acscatal.9b04023, 11263-11273, 2019.10, [URL].
16.	Yuto Sakaguchi, Arnau Call, Mihaela Cibian, Kosei Yamauchi, Ken Sakai, An earth-abundant system for light-driven CO₂ reduction to CO using a pyridinophane iron catalyst, Chemical Communications, 10.1039/c9cc04191e, 55, 59, 8552-8555, 2019.01, [URL], Herein we report an earth-abundant photocatalytic system for CO₂ reduction to CO based on an iron catalyst combined with a Cu^I photosensitizer. Under visible light irradiation CO is produced as the main product (TON_CO = 565, TOFmaxCO = 114 h^-1) with a high selectivity over H₂ production (Sel_CO₂ = 84%)..
17.	Ryoichi Kuwano, Masashi Yokogi, Ken Sakai, Shigeyuki Masaoka, Takashi Miura, Sungyong Won, Room-Temperature Benzylic Alkylation of Benzylic Carbonates Improvement of Palladium Catalyst and Mechanistic Study, Organic Process Research and Development, 10.1021/acs.oprd.9b00210, 23, 8, 1568-1579, 2019.08, [URL].
18.	Jia Wei Wang, Kosei Yamauchi, Hai Hua Huang, Jia Kai Sun, Zhi Mei Luo, Di Chang Zhong, Tong Bu Lu, Ken Sakai, A Molecular Cobalt Hydrogen Evolution Catalyst Showing High Activity and Outstanding Tolerance to CO and O₂, Angewandte Chemie - International Edition, 10.1002/anie.201904578, 58, 32, 10923-10927, 2019.07, [URL], 一般的に触媒活性が低下する一酸化炭素／酸素雰囲気下においても、優れた水素生成触媒特性を示すコバルト錯体触媒を開発した。また、その耐久性発現因子の解明にも成功した。.
19.	Alexander Rene Parent, Takashi Nakazono, Yuta Tsubonouchi, Natsuki Taira, Ken Sakai, Mechanisms of water oxidation using ruthenium, cobalt, copper, and iron molecular catalysts, Advances in Inorganic Chemistry, 10.1016/bs.adioch.2019.04.001, 197-240, 2019.01, [URL], This review focuses on the studies of molecular water oxidation catalysts based on ruthenium, cobalt, copper, and iron, with emphasis given to the works undertaken thus far by the authors' group in the last decade. A particular emphasis is given on our mechanistic studies of water oxidation, and the involvement of the chemical oxidants employed in the catalytic mechanism..
20.	Keita Koshiba, Kosei Yamauchi, and Ken Sakai, Ligand-based PCET Reduction in a Heteroleptic Ni(bpy)(dithiolene) Electrocatalyst Giving Rise to Higher Metal Basicity Required for Hydrogen Evolution, CHEMELECTROCHEM, 2019.03, [URL], 優れた水素生成触媒作用を示すニッケル錯体触媒を創出した。均一系の電気化学反応解析により鍵中間種であるヒドリド形成過程の速度論的パラメーターを決定すると同時に、DFT計算によりその活性制御因子についても解き明かすことに成功した。.
21.	Arnau Call, Mihaela Cibian, Keiya Yamamoto, Takashi Nakazono, Kosei Yamauchi, and Ken Sakai, Highly Efficient and Selective Photocatalytic CO2 Reduction to CO in Water by a Cobalt Porphyrin Molecular Catalyst, ACS Catalysis, 10.1021/acscatal.8b04975, 9, 4867-4874, 2019.04, [URL], The performance of a water-soluble cobalt porphyrin ([{meso-tetra(4-sulfonatophenyl)porphyrinato}cobalt(III)], CoTPPS) as a catalyst for the photoreduction of CO2 in fully aqueous media has been investigated under visible light irradiation using [Ru(bpy)3]2+ as a photosensitizer and ascorbate as a sacrificial electron donor. CO is selectively produced (>82%) with high efficiency (926 TONCO; TONCO = turnover number for CO). Upon optimization, selectivities of at least 91% are achieved. Efficiencies up to 4000 TONCO and 2400 h–1 TOFCO (TOFCO = turnover frequency for CO) are reached at low catalyst loadings, albeit with loss in selectivity. This work successfully demonstrates the ability of CoTPPS to perform highly efficient photoreduction of CO2 in water while retaining its high selectivity for CO formation..
22.	Kohei Morita, Ken Sakai, and Hironobu Ozawa, A New Class of Molecular-Based Photoelectrochemical Cell for Solar Hydrogen Production Consisting of Two Mesoporous TiO2 Electrodes, ACS Publications, 10.1021/acsaem.8b01992, ACS Appl. Energy Mater., 2019, 2 (2), pp 987–992, 2019.01.
23.	Keita Koshiba, Kosei Yamauchi, and Ken Sakai, Consecutive Ligand-based PCET Processes Affording a Doubly Reduced Nickel Pyrazinedithiolate which Transforms into a Metal Hydride Required to Evolve H₂, Dalton Transaction, 10.1039/C8DT04497J, 2018.11, [URL], Our DFT results demonstrate that hydrogen evolution from water catalyzed by a nickel pyradinedithiolate (dcpdt) molecular hydrogen evolution catalyst [NiII(dcpdt)2]2− proceeds via the formation of a square-planar nickel(II) hydride intermediate which is given by unprecedented structural transformation of a doubly reduced triply protonated species [NiII(dcpdtH2)(dcpdtH)]−, afforded as a result of two consecutive ligand-based reductions of [NiII(dcpdt)(dcpdtH)]− through proton-coupled electron transfer (PCET) pathways. https://pubs.rsc.org/en/content/articlelanding/2018/dt/c8dt04497j#!divAbstract.
24.	Yutaro Aimoto, Keita Koshiba, Kosei Yamauchi and Ken Sakai , "A family of molecular nickel hydrogen evolution catalysts providing tunable overpotentials using ligand-centered proton-coupled electron transfer paths", Chemical Communications, 10.1039/C8CC07467D, 2018.10, Two new nickel dithiolate derivatives have been examined for their electrocatalytic activity for hydrogen evolution reaction (HER) in attempts to clarify whether the overpotential for HER can be tuned upon varying the ligand-centered reduction potential that triggers HER by the catalysts. We demonstrate the validity of this approach to achieve desirable tunability in the overpotential for HER..
25.	Keiya Yamamoto, ＠Arnau Call, Ken Sakai, Photocatalytic H₂ Evolution using a Ru Chromophore tethered to Six Viologen Acceptors, CHEMISTRY A European Journal, 10.1002, chem.201803662, 2018.08, [URL], A new photo‐charge‐separator (PCS) consisting of a Ru(bpy)32+ (bpy: 2,2'‐bipyridine) chromophore and six viologen (MV2+) acceptors, [Ru(bpyMV2)3]14+, is synthesised and its application in photocatalytic H2 evolution is reported. The present PCS possesses shorter linkers in connecting a Ru chromophore and MV2+ acceptors in comparison with our previous PCSs (Inorg. Chem. Front., 2016, 3, 671‐680) and shows consecutive photo‐driven electron transfer in the presence of a sacrificial electron donor (EDTA), leading to multi‐electron storage over the PCS. This behavior can also be coupled with catalytic H2 evolution by the presence of a colloidal Pt catalyst. More importantly, the present PCS exhibits much higher durability during the photolysis, which is attributed to the higher rate in catalytic process. The high durability is also attributed to its bulky framework preventing undesirable side reactions..
26.	Anas Lataifeh, Heinz Bernhard Kraatz, Firas F. Awwadi, Mohammed A. Zaitoun, Ken Sakai, Platinum(II)-glutamic acid dendrimer conjugates Synthesis, characterization, DFT calculation, conformational analysis and catalytic properties, Inorganica Chimica Acta, 10.1016/j.ica.2017.12.022, 473, 245-254, 2018.03, [URL], A series of platinum(II)-L-glutamic acid dendrimer conjugates having the formula PtCl₂(5,5′-Gn(OR)-2,2′-bipyridine); Gn (n = 0, 1, 2), have been synthesized by various amide bond formation methods. The dendrimer complexes were terminated as carboxylic acid (R = H) or methyloxy ester (R = Me). The complexes were characterized by mass spectrometry, elemental analysis, UV-vis, FTIR, ¹H-, ¹³C NMR, ¹H-TOCSY, HSQC. The G1(OH) complex aggregate in solution and solid state, giving rise to a rigid conformation for the glutmaic acid side chain. The G2(OH) exists in the “monomeric” form with several conformations for the glutamic acid side chains. Complexes terminated with carboxyl group (R = H) were active catalyst toward hydrogen gas (H₂) production by photo-induced splitting of water. The turnover frequency (TOF) for the G1(OH) complex is 14.7 × 10¹⁵ s⁻¹, and it exhibits a ∼ 2-fold enhancement in H₂ production compared to the unmodified parent complex G0(OH) (TOF = 7×10¹⁵ s⁻¹). While G2(OH) complex displayed a lower hydrogen activity (TOF = 3.8 × 10¹⁵ s⁻¹) compared to G0(OH). The platinum-glutamic acid dendrimer conjugates showed a correlation between H₂ evolution activity and their ability to form aggregates, which driven by the steric hindrance of the peptide residues in the vicinity of Pt-center..
27.	Tomohiro Watanabe, Hajime Shibata, Makoto Ebine, Hiroshi Tsuchikawa, Nobuaki Matsumori, Michio Murata, Manabu Yoshida, Masaaki Morisawa, Shu Lin, Kosei Yamauchi, Ken Sakai, and Tohru Oishi , Synthesis and Complete Structure Determination of a Sperm-Activating and -Attracting Factor Isolated from the Ascidian Ascidia sydneiensis, JOURNAL OF NATURAL PRODUCTS, 10.1021/acs.jnatprod.7b01052, J. Nat. Prod., 2018, 81 (4), pp 985–997, 2018.03, [URL], https://pubs.acs.org/doi/pdf/10.1021/acs.jnatprod.7b01052.
28.	Anas Lataifeh, Heinz-Bernhard Kraatz, Firas F. Awwadi, Mohammed A. Zaitoun, Ken Sakai, Platinum(II)-glutamic acid dendrimer conjugates: Synthesis, characterization, DFT calculation, conformational analysis and catalytic properties, Inorganica Chimica Acta, 10.1016/j.ica.2017.12.022, 2018.02.
29.	Yutaro Tsuji, Keiya Yamamoto, Kosei Yamauchi, Ken Sakai, Near-Infrared-Light-Driven Hydrogen Evolution from Water using a Polypyridyl Triruthenium Photosensitizer, Angewandte Chemie - International Edition, 2017.11, ルテニウム三核の色素増感剤を利用することにより近赤外線領域の光を励起光として光化学的水素生成反応を駆動することに成功した。錯体の還元能が共存イオン種とのイオン会合体生成平衡によって精密制御可能であることも明らかにした。.
30.	Kohei Morita, Kohei Takijiri, Ken Sakai, Hironobu Ozawa, A Platinum Porphyrin Modified TiO2 Electrode for Photoelectrochemical Hydrogen Production from Neutral Water Driven by the Conduction Band Edge Potential of TiO2, Dalton Transactions, 10.1039/C7DT03710D, 46, 15181-15185, 2017.10.
31.	Shota Tanaka, Takashi Nakazono, Kosei Yamauchi, Ken Sakai, Photochemical H2 Evolution Catalyzed by Porphyrin-based Cubic Cages Singly and Doubly Encapsulating PtCl2(4,4’-dimethyl-2,2’-bipyridine), Chemistry Letters, 46, 1573, 2017.08.
32.	Yan Suffren, Masayuki Kobayashi, Jeffrey S. Ovens, Alexandre Rodrigue-Witchel, Caroline Genre, Ken Sakai, Christian Reber, Daniel B. Leznoff, [Pt(SCN)₄]^2–-Based Coordination Polymers and Supramolecular Squares Intermolecular Pt···H–C Interactions Probed by Luminescence Spectroscopy at Variable Pressure, European Journal of Inorganic Chemistry, 10.1002/ejic.201700514, 2017, 22, 2864, 2017.06, [URL].
33.	Yan Suffren, Masayuki Kobayashi, Jeffrey S. Ovens, Alexandre Rodrigue-Witchel, Caroline Genre, Ken Sakai, Christian Reber, Daniel B. Leznoff, [Pt(SCN)₄]^2–-Based Coordination Polymers and Supramolecular Squares Intermolecular Pt···H–C Interactions Probed by Luminescence Spectroscopy at Variable Pressure, European Journal of Inorganic Chemistry, 10.1002/ejic.201700149, 2017, 22, 2865-2875, 2017.06, [URL], The structures of four types of supramolecular systems containing [Pt(SCN)₄]^2– molecular units have been characterized. [Mn(bipy)₂Pt(SCN)₄]₂·2MeOH (1) and [Zn(bipy)₂Pt(SCN)₄]₂·2MeOH (2) show cis-thiocyanato ligands bridging the Pt^II and Mn^II or Zn^II ions, leading to a molecular square motif. [Zn(bipy)₂Pt(SCN)₄]₂ (3) presents chains where trans-thiocyanato ligands bridge the Zn^II and Pt^II ions. For 1–3, free thiocyanato ligands are coordinated to the Pt^II centers to complete the square-planar coordination. [Pb(bipy)₂Pt(SCN)₄]₂ (4) reveals a two-dimensional sheet structure where all SCN^– ligands bridge the Pb^II and Pt^II ions. [Pb(terpy)Pt(SCN)₄]₂ (5) is similar to 3, with two bridging trans-SCN^– ligands and two that are coordinated only to the Pt^II centers. For all compounds, d–d luminescence is observed with band maxima at approximately 14600 cm^–1 (690 nm). Spectra show characteristic shifts with pressure, indicative of either intramolecular or intermolecular effects, depending on the sign of the shift. The pressure-dependent shifts for 1–5 show rich variations. A well-documented shift to higher energy due to metal–ligand bond compression is observed for 5 and can be used as a basis for a comparison. Compounds 1–4 show a shift of E_max to lower energy with pressures below 10 kbar. A change in sign for the shift of E_max occurs at 20, 12, and 10 kbar for 1, 2, and 3, respectively. For 4, only a shift to lower energy is observed. Competing intra- and intermolecular effects lead to these variations..
34.	Masayuki Miyaji, Kyoji Kitamoto, Hironobu Ozawa, Ken Sakai, Synthesis and Characterization of a RuPt-Based Photo-Hydrogen-Evolving Molecular Device Tethered to a Single Viologen Acceptor, European Journal of Inorganic Chemistry, 10.1002/ejic.201601346, 2017, 9, 1237-1244, 2017.03, [URL].
35.	Keita Koshiba, Kosei Yamauchi, Ken Sakai, A Nickel Dithiolate Water Reduction Catalyst Providing Ligand-Based Proton-Coupled Electron-Transfer Pathways, Angewandte Chemie - International Edition, 10.1002/anie.201700927, 56, 15, 4247-4251, 2017.03, [URL].
36.	Kohei Takijiri, Kohei Morita, Takashi Nakazono, Ken Sakai, Hironobu Ozawa, Highly stable chemisorption of dyes with pyridyl anchors over TiO₂ Application in dye-sensitized photoelectrochemical water reduction in aqueous media, Chemical Communications, 10.1039/c6cc10321a, 53, 21, 3042-3045, 2017.02, [URL].
37.	Kohei Morita, Kohei Takijiri, Ken Sakai, Hironobu Ozawa, A platinum porphyrin modified TiO₂ electrode for photoelectrochemical hydrogen production from neutral water driven by the conduction band edge potential of TiO₂, Dalton Transactions, 10.1039/c7dt03710d, 46, 44, 15181-15185, 2017.01, [URL], The onset potential for H₂ production from neutral water (pH 7) catalyzed by a platinum(ii) porphyrin (PtP-py) modified TiO₂ electrode positions very close to the standard water reduction potential (less than 50 mV). H₂ production is driven by the conduction band edge potential of TiO₂ at the PtP-py-modified TiO₂ cathode..
38.	Roman Goy, Luca Bertini, Tobias Rudolph, Shu Lin, Martin Schulz, Giuseppe Zampella, Benjamin Dietzek, Felix H. Schacher, Luca De Gioia, Ken Sakai, Wolfgang Weigand, Photocatalytic Hydrogen Evolution Driven by [FeFe] Hydrogenase Models Tethered to Fluorene and Silafluorene Sensitizers, Chemistry - A European Journal, 10.1002/chem.201603140, 23, 2, 334-345, 2017.01, [URL], It is successfully shown that photocatalytic proton reduction to dihydrogen in the presence of a sacrificial electron donor, such as trimethylamine (TEA) and ascorbate, can be driven by compact sensitizer–catalyst dyads, that is, dithiolate-bridged [FeFe] hydrogenase models tethered to organic sensitizers, such as fluorenes and silafluorenes (1 a–4 a). The sensitizer–catalyst dyads 1 a–4 a show remarkable and promising catalytic activities as well as enhanced stabilities during photocatalysis performed under UV-light irradiation. The photocatalysis was carried out both in non-aqueous and aqueous media. The latter experiments were performed by solubilizing the photocatalysts within micelles formed by either sodium dodecyl sulfate (SDS) or cetyltrimethylammonium bromide (CTAB). In this study a turnover number of 539 (7 h) is achieved under optimized conditions, which corresponds to an exceptionally high turnover frequency of 77 h⁻¹. Theoretical investigations as well as emission decay experiments were performed to understand the observed phenomena together with the mechanisms of photocatalytic H₂ generation..
39.	Shota Tanaka, Takashi Nakazono, Kosei Yamauchi, Ken Sakai, Photochemical H₂ evolution catalyzed by porphyrin-based cubic cages singly and doubly encapsulating PtCl₂ (4,4'-dimethyl-2,2'-bipyridine), Chemistry Letters, 10.1246/cl.170692, 46, 10, 1573-1575, 2017, [URL], A porphyrin-based cubic cage (Cube) was reacted with a Pt(II)-based molecular H₂-evolving catalyst, PtCl₂ (dmbpy) (PtDmb; dmbpy: 4,4'-dimethyl-2,2'-bipyridine), to give Cubes incorporated with one or two equivalents of PtDmb, i.e., Cube(PtDmb) and Cube(PtDmb) ₂, which was confirmed by ESI-TOF MS spectroscopy. A photochemical H2-evolving system consisting of EDTA (sacrificial electron donor), [Ru(bpy)₃]²⁺ (photosensitizer), and methylviologen (electron relay) was used to demonstrate that the catalyst encapsulated can also serve as an effective H2-evolving catalyst..
40.	Roman Goy, Luca Bertini, Tobias Rudolph, Shu Lin, Martin Schulz, Guiseppe Zampella, Benjamin Dietzek, Felix H. Schacher, Luca De Gioia, 酒井健, Wolfgang Weigand, Photocatalytic Hydrogen Evolution Driven by [FeFe] Hydrogenase Models Tethered to Fluorene and Silafluorene Sensitizers, Chem. Eur. J., 10.1002/chem.201603140, 2016.12.
41.	Gary W. Brudvig, Joost N. H. Reek, Ken Sakai, Leone Spiccia, and Licheng Sun, Catalytic Systems for Water Splitting, ChemPlusChem, 10.1002/cplu.201600436 , 81, 10, 1017-1019, 2016.10.
42.	Gary W. Brudvig, Joost N H Reek, Ken Sakai, Leone Spiccia, Licheng Sun, Catalytic Systems for Water Splitting, ChemPlusChem, 10.1002/cplu.201600436, 81, 10, 1017-1019, 2016.10, [URL].
43.	Ryota Terao, Takashi Nakazono, Alexander Rene Parent, Ken Sakai, Photochemical Water Oxidation Catalyzed by a Water-Soluble Copper Phthalocyanine Complex, ChemPlusChem, 10.1002/cplu.201600263, 81, 10, 1064-1067, 2016.10, [URL], Copper tetrasulfonatophthalocyanine (CuPcTS) is reported to serve as a catalyst for photochemical water oxidation via a radical coupling mechanism. Chloride greatly inhibits the water oxidation rate as a result of axial chloride binding to CuPcTS, preventing formation of the Cu oxyl or hydroxyl intermediate required for O−O bond formation..
44.	Remko J. Detz, Ken Sakai, Leone Spiccia, Gary W. Brudvig, Licheng Sun, Joost N H Reek, Towards a Bioinspired-Systems Approach for Solar Fuel Devices, ChemPlusChem, 10.1002/cplu.201600446, 81, 10, 1024-1027, 2016.10, [URL].
45.	Remko J. Detz, Leone Spiccia, Gary W. Brudvig, Licheng Sun, Joost N. H. Reek, 酒井健, Towards a Bioinspired-Systems Approach for Solar Fuel Devices, ChemPlusChem, 10.1002/cplu.201600446, 81, 10, 1024-1027, 2016.09.
46.	Ryota Terao, Takashi Nakazono, Alexander Rene Parent, 酒井健, Photochemical Water Oxidation Catalysed by a Water-Soluble Copper Phthalocyanine, ChemPlusChem, 10.1002/cplu.201600263, 81, 1064-1067, 2016.07.
47.	Takashi Nakazono, 酒井健, Improving the robustness of cobalt porphyrin water oxidation catalysts by chlorination of aryl groups, Dalton Transactions, 10.1039/C6DT02535H, 45, 12649-12652, 2016.07.
48.	Christopher H. Hendon, Aron Walsh, Norinobu Akiyama, Yosuke Konno, Takashi Kajiwara, Tasuku Ito, Hiroshi Kitagawa, Ken Sakai, One-dimensional Magnus-type platinum double salts, Nature Communications, 10.1038/ncomms11950, 7, 2016.06, [URL], Interest in platinum-chain complexes arose from their unusual oxidation states and physical properties. Despite their compositional diversity, isolation of crystalline chains has remained challenging. Here we report a simple crystallization technique that yields a series of dimer-based 1D platinum chains. The colour of the Pt²⁺ compounds can be switched between yellow, orange and blue. Spontaneous oxidation in air is used to form black Pt ^2.33+ needles. The loss of one electron per double salt results in a metallic d_z² state, as supported by quantum chemical calculations, and displays conductivity of 11 S cm^-1 at room temperature. This behaviour may open up a new avenue for controllable platinum chemistry..
49.	Lin Shu, Kyoji Kitamoto, 小澤弘宜, 酒井健, Improved Photocatalytic Hydrogen Evolution Driven by Chloro(terpyridine)platinum(II) Derivatives Tethered to a Single Pendant Viologen Acceptor, Dalton Tranactions, 10.1039/C6DT01456A , 2016.05.
50.	Yuta Tsubonouchi, Lin Shu, Alexander Rene Parent, Gary Brudvig, 酒井健, Light-induced Water Oxidation Catalyzed by an Oxido-bridged Triruthenium Complex with a Ru-O-Ru-O-Ru Motif, Chemical Communications, 10.1039/C6CC02816K, 2016.05.
51.	Christopher H. Hendon, Aron Walsh, Norinobu Akiyama, Yosuke Konno, Takashi Kajiwara, Tasuku Ito, Hiroshi Kitagawa, 酒井健, One-dimensional Magnus-type platinum double salts, Nature Communications , 10.1038/ncomms11950, 2016.05, 金属的一次元伝導性を示す混合原子価白金一次元錯体の結晶構造と伝導物性について明らかにすると同時に、その一次元電子系の電子状態計算を行い、明確な現象論を提案することに成功した。.
52.	Kyoji Kitamoto, Makoto Ogawa, Gopalakrishnan Ajayakumar, Shigeyuki Masaoka, Heinz Bernhard Kraatz, Ken Sakai, Molecular photo-charge-separators enabling single-pigment-driven multi-electron transfer and storage leading to H₂ evolution from water, Inorganic Chemistry Frontiers, 10.1039/c5qi00150a, 3, 5, 671-680, 2016.05, [URL], Single-chromophore-driven single-electron-pumping processes leading to multi-electron transfer and storage are effectively promoted in natural photosynthesis, generating photocurrent at the molecular level. Moreover, these single-electron-pumping events are converted into double-electron-pumping events by releasing multiple plastoquinol molecules without releasing reactive semiquinone radicals, thereby enabling storage of two-electron-reduced molecules within the lipid bilayer constructing the thylakoid membrane. Here we report new unimolecular architectures that enable these highly sophisticated light-driven multi-electron transfer and storage processes. The photo-charge-separators (PCSs) reported herein possess a single Ru(bpy)₃²⁺ fragment with each bpy derivatized with four dicationic viologen acceptors, abbreviated as [Ru^II(bpy)₃²⁺-(MV²⁺)₁₂]²⁶⁺ (MV²⁺ is a viologen unit). These highly positively charged PCSs form stable ion pairs with anionic electron donors, enabling consecutive multi-electron transfer processes from the donors to the pendant viologen acceptors. The multiple transferred electrons are collected over twelve pendant viologen acceptors, leading to storage of 7-8 electrons per molecule. The resulting organic radicals show a strong preference to form diamagnetic π-dimers, which suppress reactive radical formation. These reducing equivalents can then be efficiently consumed in catalytic H₂ evolution from water in the presence of a colloidal platinum catalyst..
53.	Kyoji Kitamoto, Makoto Ogawa, Gopalakrishnan Ajayakumar, Shigeyuki Masaoka, Heinz-Bernhard Kraatz, 酒井健, Molecular photo-charge-separators enabling single-pigment-driven multi-electron transfer and storage leading to H2 evolution from water, Inorganic Chemistry Frontiers, 10.1039/C5QI00150A , 2016.02.
54.	Kyoji Kitamoto, Ken Sakai, Photochemical H₂ evolution from water catalyzed by a dichloro(diphenylbipyridine)platinum(ii) derivative tethered to multiple viologen acceptors, Chemical Communications, 10.1039/c5cc08044d, 52, 7, 1385-1388, 2016.01, [URL], A new single-component photocatalyst for the reduction of water to H₂, a dichloro(dpbpy)platinum(ii) derivative (dpbpy = 4,4′-diphenyl-2,2′-bipyridine) tethered to four pendant viologen acceptors (1), is shown to exhibit twice higher photocatalytic efficiency than the previously reported dichloro(bpy)-platinum(ii) analog (2; bpy = 2,2′-bipyridine), consistent with the higher absorptivity of 1 at the metal-to-ligand charge transfer (¹MLCT) band due to the larger π-conjugation in dpbpy relative to bpy..
55.	Shu Lin, Kyoji Kitamoto, Hironobu Ozawa, Ken Sakai, Improved photocatalytic hydrogen evolution driven by chloro(terpyridine)platinum(II) derivatives tethered to a single pendant viologen acceptor, Dalton Transactions, 10.1039/c6dt01456a, 45, 26, 10643-10654, 2016, [URL], Three chloro(4′-(N-methylpyridinium)-2,2′:6′,2′′-terpyridine)platinum(ii) (abbreviated as PtL²⁺) derivatives tethered to a single alkyl viologen unit (-(CH₂)_n-CH₂-N⁺C₅H₄-C₅H₄N⁺-CH₃; abbreviated as -Cn-MV²⁺, where n = 1, 3, and 4), i.e., PtL²⁺-Cn-MV²⁺, have been synthesized and investigated in detail. It is shown that the turnover number (TON) for the photocatalytic H₂ evolution from water in the presence of a sacrificial electron donor EDTA (ethylenediaminetetraacetic acid disodium salt) is dramatically improved by the attachment of a single alkyl MV²⁺ unit (TON = 21.5-25.2, 12 h). Spectrophotometric studies reveal that the photoirradiation of PtL²⁺-Cn-MV²⁺ in the presence of EDTA initially leads to the formation of a 1-electron-reduced species, and then to a 2-electron-reduced species, where reductive quenching of a photoexcited species is a major path to the reduced photoproduct in each step. Electrochemical studies show that two consecutive 1-electron reductions at the PtL²⁺ unit are nearly overlapped with the corresponding reductions at the MV²⁺ unit. The 1-electron-reduced species can be thus expressed as either PtL⁺-Cn-MV²⁺ or PtL²⁺-Cn-MV⁺, while the 2-electron-reduced one as PtL⁺-Cn-MV⁺. Moreover, the latter products behave as stacked species involving three types of π-dimer sites, (PtL⁺)₂, (MV⁺)₂, and (PtL⁺)(MV⁺), and do not drive thermal H₂ evolution according to the reaction: PtL⁺-Cn-MV⁺ + 2H⁺ → PtL²⁺-Cn-MV²⁺ + H₂. The H₂ evolution from water photocatalyzed by PtL²⁺-Cn-MV²⁺ has been found to occur via formation of 3-electron-reduced species; PtL⁺-Cn-MV⁺ + EDTA + hν → PtL⁰-Cn-MV⁺ (or PtL⁺-Cn-MV⁰) + EDTA(ox), and PtL⁰-Cn-MV⁺ (or PtL⁺-Cn-MV⁰) + 2H⁺ → PtL⁺-Cn-MV²⁺ (or PtL²⁺-Cn-MV⁺) + H₂..
56.	Takashi Nakazono, Ken Sakai, Improving the robustness of cobalt porphyrin water oxidation catalysts by chlorination of aryl groups, Dalton Transactions, 10.1039/c6dt02535h, 45, 32, 12649-12652, 2016, [URL], The water oxidation (WO) activity of a chlorinated cobalt tetraphenylporphyrin (CoClPS), possessing Cl atoms on the 2,6-positions of the aryl groups, shows higher resistance to attack by singlet oxygen, in situ generated during photochemical WO using Ru(bpy)₃ ²⁺ and S₂O₈ ^2- with the turnover frequency (TOF) and turnover number (TON) reaching 1.7 s^-1 and 836, respectively..
57.	Yuta Tsubonouchi, Shu Lin, Alexander R. Parent, Gary W. Brudvig, Ken Sakai, Light-induced water oxidation catalyzed by an oxido-bridged triruthenium complex with a Ru-O-Ru-O-Ru motif, Chemical Communications, 10.1039/c6cc02816k, 52, 51, 8018-8021, 2016, [URL], A μ-oxido-bridged triruthenium complex (RuT²⁺), formed by air-oxidation of a previously reported monoruthenium water oxidation catalyst (WOC), serves as an efficient photochemical WOC with the turnover frequency (TOF) and turnover number (TON) 0.90 s^-1 and 610, respectively. The crystal structures of RuT²⁺ and its one-electron oxidized RuT³⁺ are also reported..
58.	Kyoji Kitamoto, 酒井健, Photochemical H2 Evolution from Water Catalyzed by Dichloro(diphenylbipyridine)platinum(II) Derivative Tethered to Multiple Viologen Acceptors, Chem. Commun., 10.1039/C5CC08044D , 52, 1385-1388, 2015.11.
59.	Keiya Yamamoto, Kyoji Kitamoto, 山内幸正, 酒井健, Pt(II)-Catalyzed Photosynthesis for H2 Evolution Cycling Between Singly and Triply Reduced Species, Chem. Commun., 10.1039/C5CC03558A , 51, 14516-14159, 2015.08.
60.	Masaki Yoshida, Mio Kondo, Sena Torii, 酒井健, Shigeyuki Masaoka, Oxygen Evolution Catalysed by a Mononuclear Ruthenium Complex bearing Pendant -SO3- Groups, Angew. Chem. Int. Ed., 10.1002/anie.201503365, 54, 27, 7981-7984, 2015.05.
61.	Takashi Nakazono, Alexander Rene Parent, 酒井健, Improving Singlet Oxygen Resistance during Photochemical Water Oxidation by Cobalt Porphyrin Catalysts, Chem. Eur. J., 21, 6723-6726, 2015.03.
62.	山内幸正, 酒井健, A tricarboxylated PtCl(terpyridine) derivative exhibiting pH-dependent photocatalytic activity for H2 evolution from water, Dalton Trans., 10.1039/C5DT00425J , 2015.03.
63.	Masaki Yoshida, Mio Kondo, Toshikazu Nakamura, 酒井健, Shigeyuki Masaoka, Three Distinct Redox States of an Oxo-Bridged Dinuclear Ruthenium Complex, Angew. Chem., Int. Ed, 2014.09.
64.	Alexander Rene Parent, 酒井健, Progress in Base-Metal Water Oxidation Catalysis, ChemSusChem, 7, 2070-2080, 2014.07.
65.	Alexander Rene Parent, Takashi Nakazono, Lin Shu, Satoshi Utsunomiya, 酒井健, Mechanism of Water Oxidation by Non-Heme Iron Catalysts when Driven with Sodium Periodate, Dalton Trans, 2014.07.
66.	Ken Kawano, 山内幸正, 酒井健, A Cobalt-NHC Complex as an Improved Catalyst for Photochemical Hydrogen Evolution from Water, Chem. Commun, 2014.07.
67.	Takumi Nagashima, Takuya Nakabayashi, Takashi Suzuki, Katsuhiko Kanaizuka, Hiroaki Ozawa, Yu-Wu Zhong, Shigeyuki Masaoka, 酒井健, Masa-aki Haga, Tuning of Metal-Metal Interactions in Mixed-Valence States of Cyclometalated Dinuclear Ruthenium and Osmium Complexes Bearing Tetrapyridylpyrazine or -benzene, Organometallics, 2014.05.
68.	Kyoji Kitamoto, 酒井健, Pigment-Acceptor-Catalyst Triads for Photochemical Hydrogen Evolution, Angew. Chem., Int. Ed., , 2014.03, 水からの光化学的な水素生成反応は、水素エネルギー社会を実現するにあたって極めて重要な研究領域である。本成果では、以前我々のグループが報告した、天然の光合成を模倣したZスキーム型光水素発生デバイスの活性を、電子一時貯蔵サイトを導入させることで大幅に向上させることに成功した。本研究により得られた分子設計の指針は、様々な触媒反応系に応用可能であり大きな波及効果を示すと期待される。.
69.	Hoda A. El-Ghamry, Shigeyuki Masaoka, 酒井健, Hydrogen-bonded frameworks of propylenediamine-N,N'-diacetic acid Pt(II) complexes, synthesis, structural characterization and antitumor activity, J. Coord. Chem, 2014.03.
70.	K. El-Baradie, R. El-Sharkawy, H. El-Ghamry, 酒井健, Synthesis and characterization of Cu(II), Co(II) and Ni(II) complexes of a number of sulfadrug azodyes and their application for wastewater treatment, Spectrochim. Acta, Part A, 2014.03.
71.	Chettiyam Veettil Suneesh, Bijitha Balan, Hironobu Ozawa, Yuki Nakamura, Tetsuro Katayama, Masayasu Muramatsu, Yutaka Nagasawa, Hiroshi Miyasaka, 酒井健, Mechanistic Studies of Photoinduced Intramolecular and Intermolecular Electron Transfer Processes in RuPt-centred Photo-hydrogen-evolving Molecular Devices, Phys. Chem. Chem. Phys, 10.1039/C3CP54630F , 4, 16, 1607-1616, 2013.11.
72.	Dong Ryeol Whang, 酒井健, Soo Young Park, Highly Efficient Photocatalytic Water Reduction with Robust Iridium(III) Photosensitizers Containing Arylsilyl Substituents, Angew. Chem. Int. Ed., 10.1002/anie.201305684, 2013.09.
73.	Takashi Nakazono, Alexander Rene Parent, Ken Sakai, Cobalt Porphyrins as Homogeneous Catalysts for Water Oxidation, Chem. Commun., 10.1039/C3CC43031F, 49, 6325-6327, 2013.05, 水からの光化学的な酸素発生反応は、水を電子源とした水素生成反応や二酸化炭素還元反応に応用することが出来るため、非常に活発に行われている。本研究では、種々のコバルトポルフィリン錯体が非常に高い光酸素発生触媒活性を示すことを明らかにした。さらに、触媒反応の触媒濃度依存性から、反応の律速段階は、２分子会合過程であることが判明した。また、触媒反応の分解過程についても明らかにした。.
74.	Masayuki　Kobayashi, Didier Savard, Andrew R. Geisheimer, 酒井健, Daniel B. Leznoff, Heterobimetallic Coordination Polymers Based on the [Pt(SCN)4]2– and [Pt(SeCN)4]2– Building Blocks, Inorg. Chem., 10.1021/ic302360b, 2013.04.
75.	Masaya Okamura, Masaki Yoshida, Reiko Kuga, Ken Sakai, Mio Kondo, and Shigeyuki Masaoka, A Mononuclear Ruthenium Complex Showing Multiple Proton-Coupled Electron Transfer toward Multi-electron Transfer Reactions, Dalton Trans., 2012.06.
76.	Masayuki Kobayashi, Shigeyuki Masaoka, and Ken Sakai, Photoinduced Hydrogen Evolution from Water Based on a Z-Scheme Photosynthesis by a Simple Platinum(II) Terpyridine Derivative, Angew. Chem. Int. Ed., 2012.06, 当論文では、ビオローゲン骨格を配位子に持つターピリジン白金誘導体（PV2+）が、光増感能と水素生成触媒能を併せ持つ二機能複合型水素生成光触媒として働くことが見出された。次に、PV2+の光反応過程について検討したところ、犠牲還元剤EDTAによる２度の還元的消光に伴い生成するPV0種（PV2+の２電子還元種）を経て、水素生成が起こることを明らかにした。この系は、人工の分子性光触媒として天然のZスキーム型の光合成を達成する初の例である。.
77.	H. A. EL-Ghamry,* K. Sakai, S. Masaoka, K. Y. El-Baradie, R. M. Issa , Preparation, Characterization, Biological Activity and 3D Molecular Modeling of Mn(II), Co(II), Ni(II), Cu(II), Pd(II) and Ru(III) Complexes of Some Sulfadrug Schiff Bases, Chinese Journal of Chemistry, 10.1002/cjoc.201280024, 30, 4, 881–890, 2012.04.
78.	Masayuki Kobayashi, Shigeyuki Masaoka and Ken Sakai, Synthesis, crystal structure, spectroscopic and electrochemical properties, and H2-evolving activity of a new [PtCl(terpyridine)]+ derivative with viologen-like redox properties, Dalton Trans., DOI:10.1039/C2DT12209J, 41, 16, 4903 - 4911, 2012.03.
79.	酒井健, Hitoshi Sakai (1930-2008), Applied Geochemistry, 10.1016/j.apgeochem.2012.02.004, 2012.02.
80.	Hoda El-Ghamrya, Ken Sakai, Shigeyuki Masaoka, Kamal El-Baradiea, and Raafat Issaa , Synthesis and characterization of self-assembled coordination polymers of N-diaminomethylene-4-(3-formyl-4-hydroxy-phenylazo)-benzenesulfonamide, J. Coord. Chem. , 65, 780-794, 2012.02.
81.	Wen-Wen Yang, Yu-Wu Zhong, Shinpei Yoshikawa, Jiang-Yang Shao, Shigeyuki Masaoka, Ken Sakai, Jiannian Yao, and Masa-aki Haga, Tuning of Redox Potentials by Introducing a Cyclometalated Bond to Bis-tridentate Ruthenium(II) Complexes Bearing Bis(Nmethylbenzimidazolyl)benzene or -pyridine Ligands, Inorg. Chem., 2012.02.
82.	Saya Tanaka, Masahiko Annaka and Ken Sakai , Visible Light-induced Water Oxidation Catalyzed by Molybdenum-based Polyoxometalates with Mono- and Dicobalt(III) Cores as Oxygen-Evolving Centers, Chem. Commun. , 10.1039/C2CC16821A, 48, 1653-1655, 2011.12, 本論文では、単核、複核のコバルト（Co）ポリオキソメタレート錯体が、極めて高い光酸素発生触媒能を有することを見出した。更に、動的光散乱（DLS）法により、コロイド種が触媒反応に関与しないことを明らかにした。本研究は、酸素発生触媒反応に関して、触媒の安定性をDLSを用いて評価した初の論文であり、その後の触媒反応に関する研究の礎を築いた。.
83.	Keita Kuroiwa, Masaki Yoshida, Shigeyuki Masaoka, Kenji Kaneko, Ken Sakai, and Nobuo Kimizuka, Self-assembly of Tubular Microstructures from Mixed-valence Metal Complexes and their Reversible Transformation via External Stimuli, Angew. Chem. Int. Ed., 10.1002/anie.201105080, 51, 656-659, 2011.12.
84.	Ayano Kimoto, Kosei Yamauchi, Masaki Yoshida, Shigeyuki Masaoka, and Ken Sakai, Kinetics and DFT Studies on Water Oxidation by Ce4+ Catalyzed by [Ru(terpy)(bpy)(OH2)]2+, Chem. Commun., 10.1039/C1CC15109F, 48, 239-241, 2011.11, 酒井グループでは以前ルテニウム単核錯体が、優れた酸素発生触媒であることを見出した。本論文では、この酸素発生反応のメカニズムを解明するため、触媒として用いているルテニウム錯体の水溶液と水の酸化剤である硝酸セリウム(IV)アンモニウムの水溶液を高速で混合し、紫外可視吸収スペクトルの時間変化を追跡した。この吸収スペクトルを解析することにより、５つの中間体が存在することが明らかになった。また、密度汎関数法で得られた結果と比較検討することにより、酸素発生に関与している活性種、並びに触媒反応機構を見出すことができた。.
85.	Kosei Yamauchi, Shigeyuki Masaoka, and Ken Sakai, Stability of Pt(II)-Based H2-Evolving Catalysts against H2 in Aqueous Solution, Dalton Trans., 10.1039/C1DT11217A , 40, 12447-12449, 2011.10.
86.	Katsuaki Kobayashi, Masamichi Ishikubo, Katsuhiko Kanaizuka, Keiko Kosuge, Shigeyuki Masaoka, Ken Sakai, Koichi Nozaki, and Masa-aki Haga , Proton-Induced Tuning of Metal-Metal Communication in Rack-Type Dinuclear Ru Complexes Containing Benzimidazolyl Moieties, Chem. Eur. J., 17, 6954-6963, 2011.05.
87.	Hironobu Ozawa and Ken Sakai, Photo-Hydrogen-Evolving Molecular Devices Driving Visible-Light-Induced Water Reduction into Molecular Hydrogen: Structure-Activity Relationship and Reaction Mechanism, Chem. Commun., 10.1039/C0CC04708B, Feature Article, 47, 8, 2227-2242, 2011.02, 本論文では、数十年に渡り酒井グループを中心として行われてきた光水素発生デバイスの研究で得られた知見を総合し、その触媒反応機構について詳細に論述した。その中で、光電子移動過程、水素生成触媒過程、及び犠牲還元試薬による還元過程について詳細に解き明かすことに成功した。また、本研究により確立された設計指針により合成した、新規光水素発生デバイスの活性はやはり高いものであることがわかり、見出した法則は、広く適用することができる重要なものであることが分かった。.
88.	Gopalakrishnan Ajayakumar, Masayuki Kobayashi, Shigeyuki Masaoka, and Ken Sakai, Light-Induced Charge Separation and Photocatalytic Hydrogen Evolution from Water using RuIIPtII-Based Molecular Devices: Effects of Introducing Additional Donor and/or Acceptor Sites, Dalton Trans., 10.1039/C0DT01673J., 2011.02.
89.	Masanari Hirahara, Shigeyuki Masaoka, and Ken Sakai, Syntheses, Characterization, and Photochemical Properties of Amidate-Bridged Pt(bpy) Dimers Tethered to Ru(bpy)32+ Derivatives, Dalton Trans., DOI:10.1039/C0DT01548B, 2011.02.
90.	Makoto Ogawa, Gopalakrishnan Ajayakumar, Shigeyuki Masaoka, Heinz-Bernhard Kraatz, and Ken Sakai, Platinum(II)-Based Hydrogen-Evolving Catalysts Linked to Multipendant Viologen Acceptors: Experimental and DFT Indications for Bimolecular Pathways, Chem. Eur. J., 2011, 17, 1148-1162. , 10.1002/chem.201002470, 17, 4, 1148-1162, 2011.01, 本論文で報告した研究では、複数のビオローゲンユニットを共有結合させた電子貯蔵能を有する白金(II)単核錯体触媒の合成を行い、水素生成触媒機能の測定を行った。その結果、分子内のビオローゲン数の増大とともに触媒機能の低下が観測され、水素生成反応の触媒過程において、白金単核錯体系においてもPt−Pt結合をもつ二核中間体を与えることが初めて示された。さらに、DFT分子軌道計算から、白金単核錯体の触媒反応過程において、まずヒドリド中間体を生成した後に、基底状態の白金単核錯体と二量体を生成することが明らかとなった。.
91.	Andrew Geisheimer, John Wren, Vladimir Michaelis, Masayuki Kobayashi, Ken Sakai, Scott Kroeker, and Daniel Leznoff, Aggregation of [Au(CN)4]- Anions: Detection by 15N CP-MAS NMR and the Structural Factors Influencing Intermolecular Au•••N Interactions, Inorg. Chem., 10.1021/ic101782v, 50, 4, 1265-1274, 2011.01.
92.	Masaki Yoshida, Shigeyuki Masaoka, Jiro Abe, and Ken Sakai, Catalysis of Mononuclear Aquaruthenium Complexes in Oxygen Evolution from Water: A New Radical Coupling Path using Hydroxocerium(IV) Species, Chem. Asian J., 2010.09, 本論文で報告した研究では、各種ルテニウム単核錯体を触媒として用いたセリウム(IV)を酸化剤とする酸素発生反応について、酸素定量実験、電気化学実験、及びDFT計算から評価を行った。その結果、これまで30年間、酸素発生反応の酸化剤として用いられてきたセリウム(IV)イオンに配位したOH-イオンがラジカル性を帯びていることが示唆され、ルテニウム単核錯体の系ではセリウム(IV)が酸素発生反応に重要な役割を果たしていることが判明した。また、ルテニウム錯体の構造を変化させることで、触媒反応機構が変化することも明らかにした。.
93.	Josaku Kiyota, Junpei Yokoyama, Masaki Yoshida, Shigeyuki Masaoka, and Ken Sakai, Electrocatalytic Oxygen Evolution from Water at an ITO Electrode Modified with [Ru(terpy){4,4'-(CH2PO3H2)2-2,2'-bpy}(OH2)]2+: Evidence for a Unimolecular Pathway, Chem. Lett., 2010.09.
94.	Saya Tanaka, Shigeyuki Masaoka, Kosei Yamauchi, Masahiko Annaka, and Ken Sakai, Photochemical and Thermal Hydrogen Production from Water Catalyzed by Carboxylate-Bridged Dirhodium(II) Complexes, Dalton Trans., 2010.09.
95.	Sk. Jasimuddin, Tomoko Yamada, Kazunori Fukuju, Joe Otsuki, and Ken Sakai, Photocatalytic Hydrogen Production from Water in Self-assembled Supramolecular Iridium-cobalt Systems, Chem. Commun., 2010.09.
96.	Sayaka Hatano, Ken Sakai, and Jiro Abe, Unprecedented Radical-Radical Reaction of a [2.2]Paracyclophane Derivative Containing Imidazolyl Radical Moiety, Org. Lett. , 12, 4152-4155, 2010, 12, 4152-4155., 2010.08.
97.	Hironobu Ozawa, Masayuki Kobayashi, Bijitha Balan, Shigeyuki Masaoka, and Ken Sakai, Photo-Hydrogen-Evolving Molecular Catalysts Consisting of Polypyridyl Ruthenium(II) Photosensitizers and Platinum(II) Catalysts: Insights into the Reaction Mechanism , Chem. Asian J., 5, 1860-1869, 2010, 5, 1860-1869, 2010.07.
98.	Masayuki Kobayashi, Shigeyuki Masaoka, and Ken Sakai, Syntheses, Characterization, and Photo-Hydrogen-Evolving Properties of Tris(2,2'-bipyridine)ruthenium(II) Derivatives Tethered to an H2-Evolving (2-phenylpyridinato)platinum(II) Unit, Molecules, 15, 4908-4923, 2010, 15, 4908-4923. , 2010.07.
99.	Shigeyuki Masaoka, Yuichiro Mukawa, and Ken Sakai, Frontier Orbital Engineering of Photo-Hydrogen-Evolving Molecular Devices: a Clear Relationship Between the H2-Evolving Activity and the Energy Level of the LUMO, Dalton Trans., 39, 5868-5876, 2010, 39, 5868-5876., 2010.04, 本論文で報告した研究では、光水素発生デバイスの電子移動過程を明らかにするため、ルテニウム錯体部位及び白金錯体部位を共有結合でリンクした新規光水素発生デバイスの開発を行った。さらに、それらの光水素発生デバイスの活性及び光電子移動過程の評価を行った。その結果、白金側に配位したπ共役系配位子の還元電位の精密制御により、分子内電子移動の駆動力を自在に制御できることが判明した。また、見出した法則は、広く適用することができる重要なものであることが分かった。.
100.	Makoto Ogawa, Bijitha Balan, Gopalakrishnan Ajayakumar, Shigeyuki Masaoka, Heinz-Bernhard Kraatz, Masayasu Muramatsu, Syoji Ito, Yutaka Nagasawa, Hiroshi Miyasaka and Ken Sakai, Photoinduced Electron Transfer in Tris(2,2´-bipyridine)ruthenium(II)-Viologen Dyads with Peptide Backbones Leading to Long-Lived Charge Separation and Hydrogen Evolution , Dalton Trans., in press, 2010.03.
101.	Hoda El-Ghamry, Raafat Issa, Kamal El-Baradie, Shigeyuki Masaoka and Ken Sakai, Dibromido(2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene)cobalt(III) bromide, Acta Cryst., E65, m1378-m1379, 2009.12.
102.	Masaki Yoshida, Shigeyuki Masaoka and Ken Sakai, Oxygen Evolution from Water Catalyzed by Mononuclear Ruthenium Complexes with a Triazamacrocyclic Ligand in a Facial Fashion, Chem. Lett., 2009, 38, 702-703, 2009.07.
103.	Hisashi Itoh, Eiji Yamamoto, Shigeyuki Masaoka, Ken Sakai and Makoto Tokunaga, Kinetic Resolution of P-Chirogenic Compounds by Pd-catalyzed Alcoholysis of Vinyl Ethers, Adv. Synth. Cat., 2009, 351, 1796-1800, 2009.07.
104.	Reiko Okazaki, Shigeyuki Masaoka and Ken Sakai, Photo-Hydrogen-Evolving Activity of Chloro(terpyridine)platinum(II): a Single-Component Molecular Photocatalyst, Dalton Trans., 2009, 6127-6133, 2009.06.
105.	Kosei Yamauchi, Shigeyuki Masaoka and Ken Sakai, Evidence for the Pt(II)-Based Molecular Catalysis in Thermal Reduction of Water into Molecular Hydrogen, J. Am. Chem. Soc., 2009, 131, 8404-8406, 2009.06.
106.	T. Yamaguchi, S. Masaoka and K. Sakai, Hydrogen Production from Water Catalyzed by an Air-stable Di-iron Complex with a Bio-relevant Fe2(μ-S)2 Core, Chem. Lett., 2009, 38, 434-435, 2009.05.
107.	M. Hirahara, S. Masaoka and K. Sakai, Bis(2,2'-bipyridine){ethyl4'-[N-(4-carbamoylphenyl)carbamoyl]-2,2'-bipyridine-4-carboxylate}ruthenium(II) bis[hexafluoridophosphate(V)], Acta. Cryst., E65, m228-m229, 2009.02.
108.	S. Masaoka and K. Sakai, Clear Evidence Showing the Robustness of a Highly Active Oxygen-Evolving Mononuclear Ruthenium Complex with an Aqua Ligand, Chem. Lett., 38, 182-3, 2009.02.
109.	M. Kobayashi, S. Masaoka and K. Sakai, Synthesis, Crystal Structure, Solution and Spectroscopic Properties, and Hydrogen-Evolving Activity of [K(18-Crown-6)][Pt(II)(2-phenylpyridinato)Cl2], Photochem. Photobiol. Sci., 8, 196-203, 2009.01.
110.	T. Yamaguchi, S. Masaoka and K. Sakai, Bis(triethylammonium) bis(μ-pyrazine-2,3-dithiolato)bis(pyrazine-2,3-dithiolato)diferrate(III) methanol disolvate, Acta. Cryst., 2009, E65, m77-m78, 2009.01.
111.	T. Yamaguchi, S. Masaoka and K. Sakai, Diaqua(1,4,7,10,13-pentaoxacyclopentadecane)iron(II) bis(μ-cis-1,2-dicyano-1,2-ethylenedithiolato)bis[(cis-1,2-dicyano-1,2-ethylenedithiolato)ferrate(III)]1,4,7,10,13-pentaoxacyclopentadecanedisolvate, Acta. Cryst., 2008, E64, m1557, 2008.11.
112.	M. Kobayashi, S. Masaoka and K. Sakai, N-(1,10-phenanthrolin-5-yl)-4-(pyridin-2-yl)benzamide monohydrate, Acta. Cryst., 2008, E64, o1979, 2008.09.
113.	M. Kobayashi, S. Masaoka and K. Sakai, Chrolo(dimethylsulfoxide)(phenylpyridinato)platinum(II), Acta. Cryst., 2008, E64, m1325, 2008.09.
114.	Leoni A. Barrios, Guillem Aromi, Jorge Salinas Uber, Olivier Roubeau, Ken Sakai, Shigeyuki Masaoka, Patrick Gamez and Jan Reedijk, A Mixed-Valence [MnIIMnIIIMnII] Complex of a Linear Phenol-bis-pyrazole Ligand with an S = 3 Spin Ground State, Eur. J. Inorg. Chem., 2008, 24, 3871-3876, 2008.08.
115.	H. El-Ghamry, R. Issa, K. El-Baradie, K. Isagai, S. Masaoka and K. Sakai, 4-[(3-Formyl-4-hydroxyphenyl)diazenyl]-N-(pyrimidin-2-yl)benzenesulfonamide, Acta. Cryst., 2008, E64, o1673-o1674, 2008.07.
116.	M. J. Katz, K. Sakai and D. B. Leznoff, The use of aurophilic and other metal-metal interactions as crystal engineering design elements to increase structural dimensionality, Chem. Soc. Rev., 2008, 37(9), 1884-95., 2008.07.
117.	H. El-Ghamry, R. Issa, K. El-Baradie, K. Isagai, S. Masaoka and K. Sakai, 1-[4-(Diaminomethyleneaminosulfonyl)phenyliminiomethyl]-2-naphtholate N,N-dimethylformamide disolvate, Acta. Cryst., 2008, E64, o1350-o1351, 2008.06.
118.	G. Bhargava, A. Anand, M. Mahajan, T. Saito, K. Sakai and C. Medhi, Regio- and π -facial selective Lewis acid interceded Diels-Alder reactions of α -dienyl-β -lactams: an indepth analysis, Tetrahedron, 2008, 64(28), 6801-6808, 2008.04.
119.	Ken Sakai and Hironobu Ozawa, Homogeneous catalysis of platinum(II) complexes in photochemical hydrogen production from water, Coordination Chemistry Reviews, 251, 2753-2766, 2007.11.
120.	Singo Ogata, Shigeyuki Masaoka, Ken Sakai and Tsuyoshi Satoh, The first example of regiospecific magnesium carbenoid 1,3-CH insertion: its mechanism and stereochemistry, Tetrahedron Letters, 48, 5017-5021, 2007.07.
121.	Hironobu Ozawa and Ken Sakai, An Effect of Structural Modification in the Photo-hydrogen-evoluting RuIIPtII Dimers, Chemistry Letters, 36, 920-921, 2007.07.
122.	Hironobu Ozawa, Yuki Yokoyama, Masa-aki Haga, and Ken Sakai, Syntheses, Characterization, and Photo-Hydrogen-Evolving Properties of Tris(2,2´-bipyridine)ruthenium(II) Derivatives Tethered to a cis-Pt(II)Cl2 Unit: Insights into the Structure-Activity Relationship, Dalton Trans., 12, 1197-1206, 2007.05.
123.	Ken Sakai, Kazuo Yokokawa, and Yoshimi Yokoyama, Pt2II and Pt2III dimers containing a Pt2(2,2\'-bipyridine)2(μ-N,N-dimethylguanidinato)2 unit, Acta Crystallogr., C63, m36-m41, 2007.02.
124.	Hiromichi Egami, Ryo Irie, Ken Sakai, and Tsutomu Katsuki, Enantioselective Epoxidation of Conjugated Z-Olefins with Newly Modified Mn(salen) Complex, Chemistry Letters, 36, 46-47, 2007.01.
125.	Ken Sakai, Yuki Yokoyama, and Shigeyuki Masaoka, cis-Dichlorobis(4-methylpyridine-κN)platinum(II), Acta Crystallogr., E63, m97-m99, 2007.01.
126.	Tsuyoshi Sato, Mariko Miura, Ken Sakai, Yoshimi Yokoyama, Reaction of magnesium cyclopropylidene with N-lithio arylamines: a method for generation of a-amino-substituted cyclopropylmagnesiums and a study for their reactivity with electrophiles, Tetrahedron, 4253-4261, 2006.05.
127.	Hironobu Ozawa, Masa-aki Haga, Ken Sakai, A Photo-Hydrogen-Evolving Molecular Device Driving Visible-Light-Induced EDTA-Reduction of Water into Molecular Hydrogen, J.Am.Chem.Soc., 4926-4927, 2006.04.
128.	Ken Sakai, Hironobu Ozawa, Hajime Yamada, Taro Tsubomura, Mariko Hara, Akon Higuchi, Masa-aki Haga, A Tris(2,2'-bipyridine)ruthenium(II)Derivative Tetherred to a cis-PtCl2(amine)2moiety:Syntheses, Spectroscopic properties, and Visible-Light-Induced Scission of DNA, Dalton Trans., 3300-3305, 2006.04.
129.	Mina Mizota, Yoshimi Yokoyama, and Ken Sakai, Tetrakis(2-thiopydridone)platinum(II) chloride, Acta Crystallogr., E61, m1433-m1435, 2005.01.
130.	Hitomi Shiraishi, Reiko Jikido, Kanako Matsufuji, Tatsuaki Nakanishi, Takuya Shiga, Masaaki Ohba, Ken Sakai, Hiroshi Kitagawa, and Hisashi Okawa, Dinuclear Mn(II), Ni(II), and Zn(II) Complexes Bridged by Bis(p-nitrophenyl) Phosphate Ion: Relevance to Bimetallic Phosphodiesterase, Bull. Chem. Soc. Jpn., 10.1246/bcsj.78.1072, 78, 6, 1072-1076, 78, 1072-1076, 2005.01.
131.	K. Matsumoto, Y. Sawada, B. Saito, K. Sakai, and T. Katsuki, Construction of Pseudo-Heterochiral and -Homochiral Di-μ-oxotitanium(Schiff base)　Dimers and Enantioselective Epoxidation Using　Aqueous Hydrogen Peroxide, Angew. Chem. Int. Ed., 10.1002/anie.200501318, 44, 31, 4935-4939, in press., 2005.01.
132.	Tomona Yutaka, Shinya Obara, Masa-aki Haga, Yoshimi Yokoyama, and Ken Sakai, (2,2'-Bipyridine)chloro(4'-tolyl-2,2':6',2''-terpyridine)iridium(III) bis(hexafluorophosphate) acetonitrile disolvate, Acta. Crystallogr., 10.1107/S1600536805018702, 61, M1357-M1359, E61, m1357-m1359, 2005.01.
133.	Gaurav Bhargava, Mohinder P. Mahajan, Takao Saito, Takashi Otani, Mai Kurashima, Ken Sakai, Highly Diasteroselective and Remarkably -Facially Selective Lewis Acid-Catalysed Diels-Alder Cycloaddition Reactions: Access to Novel 1,3,4-Trisubstituted 2-Azetidinones, Eur. J. Org. Chem., 2397-2405, 2005.01.
134.	Tomona Yutaka, Shinya Obara, Satoshi Ogawa, Koichi Nozaki, Noriaki Ikeda, Takeshi Ohno, Youichi Ishii, Ken Sakai, and Masa-aki Haga, Syntheses and Properties of Emissive Iridium(III) Complexes with Tridentate Benzimidazole Derivatives, Inorg. Chem., 10.1021/ic048622z, 44, 13, 4737-4746, 44, 4737-4746, 2005.01.
135.	Mitsuru Shoji, Hiroki Imai, Makoto Mukaida, Ken Sakai, Hideaki Kakeya, Hiroyuki Osada, and Yujiro Hayashi, Total Synthesis of Epoxyquinols A, B, and C and Epoxytwinol A and the Reactivity of a 2H-Pyran Derivative as the Diene Component in the Diels-Alder Reaction, J. Org. Chem., 70, 79-91, 2005.01.
136.	Tomoaki Tanase, Eri Goto, Rowshan A. Begum, Makiko Hamaguchi, Shuzhong Zhan, Masayasu Iida, and Ken Sakai, Reactive Rigid-Rod Organometallic Polymers Involving Linear Triplatinum Units Connected by p-Conjugated Bisisocyanides, Organometallics, 23, 5975-5988., 2004.01.
137.	Eri Goto, Miho Usuki, Hiroe Takenaka, Ken Sakai, and Tomoaki Tanase, Electron-Rich Diplatinum(0) Metallocryptate Promoting Novel Successive Encapsulation of Acidic Hydrides, Organometallics, 23, 6042-6051, 2004.01.
138.	Eri Goto, Rowshan A. Begum, Shuzhong Zhan, Tomoaki Tanase, Katsumi Tanigaki, and Ken Sakai, Linear, Redox-Active Pt6 and Pt2Pd2Pt2 Clusters, Angew. Chem. Int. Ed., 43, 5029-5032., 2004.01.
139.	Ken Sakai, Yoshimi Yokoyama, Hideki Hama, Kaoru Kato, Yoshie Ikuta, Taro Tsubomura, and Tomoaki Tanase, Bis[μ-3-(N'-methyl-4,4'-bipyridinium-1-yl)propionamidato] bis[cis-diammineplatinum(II)] hexaperchlorate dihydrate in a head-to-tail isomerism, Acta Crystallogr., E60, m664-m667, 2004.01.
140.	Kazuo Yokokawa and Ken Sakai, Di-μ-pivalamidato-κ4N,O-bis[(sulfato)(2,2'-bipyridine-κ2N,N')platinum(III)] tetrahydrate in a head-to-tail isomerism, Acta Crystallogr., C60, m244-m247, 2004.01.
141.	Mina Mizota and Ken Sakai, Di-μ-aminopyridinato-bis[(2,2'-bipyridine)platinum(II)] dinitrate tetrahydrate in a head-to-tail isomerism, Acta Crystallogr., E60, m473-m476, 2004.01.
142.	Ken Sakai, Yosuke Konno, Noboru Takayama, and Satoru Takahashi, The First Bent Form for the Hydroxo-Bridged cis-Diammineplatinum(II) Dimer: [Pt2(NH3)4(m-OH)2](ClO4)2, Acta Crystallogr., B60, 255-262, 2004.01.
143.	Ken Sakai, Itsuki Sakai, Neil D. Draper, Daniel B. Leznoff, Di-μ-α-pyrrolidinonatobis[cis-diammineplatinum(II)] sulfate hydrate in a Head-to-Head isomerism, Acta Crystallogr., E60, m273-m276, 2004.01.
144.	Ken Sakai, Itsuki Sakai, Takashi Kajiwara, and Tasuku Ito, Di-μ-α-pyrrolidinonatobis[cis-diamminechloroplatinum(III)] sulfate dihydrate: a head-to-head isomer, Acta Crystallogr., E60, m255-m258., 2004.01.
145.	Ken Sakai and Yoshinobu Miyabe, (1,10-Phenanthroline)bis(2,2'-bipyridine)ruthenium(II) tetracyanoplatinate(II), Acta Crystallogr., C60, m69-m72, 2004.01.
146.	Ken Sakai, Yuichi Uchida, Takashi Kajiwara, and Tasuku Ito, Bis[tris(2,2'-bipyridine)ruthenium(II)] hexacyanoferrate(III) chloride octahydrate, Acta Crystallogr., C60, m65-m68, 2004.01.
147.	Ken Sakai, Mina Mizota, and Norinobu Akiyama, Bis(2-aminopyridine)(2,2'-bipyridine)platinum(II) tetracyanoplatinate(II) dihydrate, Acta Crystallogr., E60, m88-m90, 2004.01.
148.	Ken Sakai and Eri Ishigami, Bis[di-μ-isobutyratobis[cis-diammineplatinum(II)]] tetrakis(perchlorate), Acta Crystallogr., E60, m65-m68, 2004.01.
149.	Ken Sakai, Eri Ishigami, Kazuo Yokokawa, Takashi Kajiwara and Tasuku Ito, Di-μ-pivalato-bis[cis-diammineplatinum(II)] bis(perchlorate) pivalic acid solvate, Acta Crystallogr., E59, m1178-m1180, 2003.01.
150.	Tsuyoshi Satoh, Tadashi Kawashima, Satoru Takahashi, and Ken Sakai, A new synthesis, including asymmetric synthesis, of spiro[4.n]alkenones from three components: cyclic ketones, chloromethyl p-tolyl sulfoxide, and acetonitrile; and a formal total synthesis of racemic acorone, Tetrahedron, 59, 9599-9607, 2003.01.
151.	Tsuyoshi Satoh, Takayuki Shimura, and Ken Sakai, The first examples of an amide-carbonyl stabilized oxiranyl anion: generation from epoxysilane, its properties, and trapping with electrophiles, Heterocycles, 59, 137-147, 2003.01.
152.	Ken Sakai, Yoshie Ikuta, Taro Tsubomura, Kaoru Kato, Yoshimi Yokoyama, Takashi Kajiwara and Tasuku Ito, A head-to-tail isomer of bis[μ-2-(N'-methyl-4,4'-bipyridinium-1-yl)-acetamidato]bis[cis- diammineplatinum(II)] hexaperchlorate dihydrate, Acta Crystallogr., E59, m780-m783, 2003.01.
153.	Ken Sakai, Norinobu Akiyama, and Mina Mizota, Bis(2-aminopyridine)(2,2'-bipyridine)platinum(II) bis(oxalato)platinate(II) dihydrate, Acta Crystallogr., E59, m636-m638, 2003.01.
154.	Ken Sakai, Mai Kurashima, Norinobu Akiyama, Naoki Satoh, Takashi Kajiwara and Tasuku Ito, A head-to-head isomer of di-μ-pivalamidatobis[(1,10-phenanthroline)platinum(II)] dinitrate dihydrate, Acta Crystallogr., C59,m345-m349, 2003.01.
155.	Ken Sakai, Meiko Shiomi, Taro Tsubomura, Kaoru Kato, Yoshimi Yokoyama, Takashi Kajiwara, and Tasuku Ito, A head-to-head isomer of di-μ-bis(N-methylisonicotinamidato)bis[cis-diammineplatinum(II)] tetraperchlorate, Acta Crystallogr., E59, m559-m561, 2003.01.
156.	Ken Sakai, Tomohiko Sakamoto, Takashi Kajiwara, and Tasuku Ito, A head-to-head isomer of di-μ-α-pyrrolidinonatobis[cis-bromodiammineplatinum(III)] dinitrate, Acta Crystallogr., E59, m553-m555, 2003.01.
157.	Ken Sakai and Satoru Takahashi, A head-to-head isomer of Bis{di-μ-(5-carboxy-a-pyridonato)bis[cis-diammineplatinum(II)]} tetranitrate dihydrate, Acta Crystallogr., E59, m532-m535, 2003.01.
158.	Ken Sakai, Yoshimi Yokoyama, Ken Okamoto, and Satoru Takahashi, Dichloro(4-amino-2,2'-bipyridine)platinum(II) dihydrate, Acta Crystallogr., E59, m518-m520, 2003.01.
159.	Ken Sakai, Mai Kurashima, Manabu Osada, and Satoru Takahashi, (N-methyl-4,4'-bipyridinium)(2,2':6',2"-terpyridine)platinum(II) triperchlorate hydrate, Acta Crystallogr., E59, m515-m517, 2003.01.
160.	Ken Sakai, Manabu Osada, Yoshimi Yokoyama, Yasushi Tomita, and Taro Tsubomura, (2,2'-Bipyridine)bis(N-methyl-4,4'-bipyridinium)platinum(II) tetraperchlorate, Acta Crystallogr., E59, m512-m514, 2003.01.
161.	Ken Sakai, Norinobu Akiyama, and Mina Mizota, Bis(2-aminopyridine)(2,2'-bipyridine)platinum(II) dinitrate dihydrate, Acta Crystallogr., E59, m459-m461, 2003.01.
162.	Yujiro Hayashi, Tsuboi, Wataru Tsuboi, Ashimine, Itaru Ashimine, Tatsuya Urushima, Mitsuru, Shoji, and Ken Sakai, The Direct and Enantioselective, One-pot, Three-component, Cross-Mannich Reaction of Aldehydes, Angew. Chem. Int. Ed., 42, 3677-3680, 2003.01.
163.	Ken Sakai, Ken Okamoto, Satoru Takahashi, and Kazuo Yokokawa, N-Methyl-N'-(3-phthalimidopropyl)-4,4'-bipyridinium diiodide, Acta Crystallogr., E59, o917-o918, 2003.01.
164.	Ken Sakai, Eri Ishigami, Kazuo Yokokawa, Takashi Kajiwara, and Tasuku Ito, Di-μ-pivalatobis[cis-diammineplatinum(II)] sulfate hydrate, Acta Crystallogr., E59, m443-m445, 2003.01.
165.	Ken Sakai, Mai Kurashima, [μ-2,3,5,6-Tetrakis(2-pyridyl)pyrazine]bis[chloroplatinum(II)] Bis[trichloro(dimethylsulfoxide-S)platinate(II)], Acta Crystallogr., E59, m411-m413, 2003.01.
166.	Ken Sakai, Norinobu Akiyama, Mina Mizota, Kazuo Yokokawa, and Yoshimi Yokoyama, Bis(guanidinium) bis(oxalato)platinate(II), Acta Crystallogr., E59, m408-m410, 2003.01.
167.	Ken Sakai, Eri Ishigami, Yosuke Konno, Takashi Kajiwara, and Tasuku Ito, New Partially-Oxideized 1-D Platinum Chain Complexes Consisting of Carboxylate-Bridged cis-Diammineplatinum Dimer Cations, J. Am. Chem. Soc., 58, 9213-9222, 2002.09.
168.	Tadahiro Kato, Masahiro Hoshikawa, Yoshihiro Yaguchi, Kiyokazu Izumi ,Yukio Uotsu and Ken Sakai, Synthesis of dl-12-Epiverticillol, Tetrahedron, 58, 9213-9222, 2002.01.
169.	Yujiro Hayashi, Mitsuru Shoji, Junichiro Yamaguchi, Kenji Sato, Shinpei Yamaguchi, Takasuke Mukaiyama, Ken Sakai, Yukihiro Asami, Hideaki Kakeya, Hiroyuki Osada, Asymmetric Total Synthesis of (-)-Azaspirene, a Novel Angiogenesis Inhibitor, J. Am. Chem. Soc., 124, 12078-12079, 2002.01.
170.	Tsuyoshi Satoh, Noriko Hanaki, Yuko Kuramochi, Yujiro Inoue, Kayo Hosoya, and Ken Sakai, A new method for synthesis of allenes, including an optically active form, from aldehydes and alkenyl aryl sulfoxides by sulfoxide-metal exchange as the key reaction and an application to a total synthesis of male bean weevil sex attractant, Tetrahedron, 58, 2533-2549, 2002.01.
171.	T. Tsubomura, Takayuki Tanihata, Tetsuya Yamakawa, Rakuko Ohmi, Tsuyoshi Tamane, Akon Higuchi, Akira Katoh, and K. Sakai, Synthesis and Structure of New Binuclear Organopalladium Macrocyclic Complexes, Organometallics, 20，3833-3835, 2001.01.
172.	T. Tsubomura, M. Ezawa, T. Sato and K. Sakai, A Hexaimino Cryptand containing Naphthyl Groups ; Structural Characterization of Mononuclear Complexes and Catalysis in Hydrolysis of p-Nitro Phosphate, Inorg. Chim. Acta, 310，265-267, 2000.01.
173.	Akon Higuchi, Shinya Adachi, Takeshi Imizu, Yoon Boo Ok, Taro Tsubomura, Mariko Hara, and Ken Sakai, Ocillation of Membrane Potential in Immobilized DNA Membranes, J. Phys. Chem. B, 104, 9864-9872, 2000.01.
174.	Ken Sakai, Yasushi Tomita, Takuma Ue, Koji Goshima, Masakatsu Ohminato, Taro Tsubomura, Kazuko Matsumoto, Kenji Ohmura, and Kazuyuki Kawakami, Syntheses, Crystal Structures, and Molecular Mechanics Studies of a New Antitumor-Active cis-PtCl2(pzH)2 (pzH=Pyrazole) and the Related Complexes. A Novel Magnus-Type Double-Salt [Pt(pzH)4][PtCl4][cis-PtCl2(pzH)2]2 Involving Two Perpendicularly Aligned 1D Chains, Inorg. Chim. Acta, 297/1-2, 64-71, 2000.01.
175.	Kazuko Matsumoto and Ken Sakai, Structures and Reactivities of Platinum-Blues and the Related Amidate-Bridged PlatinumIII Compounds, Adv. Inorg. Chem., 49, 375-427, 1999.01.
176.	Ken Sakai, and Taro Tsubomura, Recent Development in the Platinum-Blue Chemistry, 4, 295-300, 1999.01.
177.	Masami Ito, Ken Sakai, Taro Tsubomura, and Yu-saku Takita, Transesterification by (Hydroxo)nickel(II) Complex in the Presence of External Alcohol, Bull. Chem. Soc. Jpn., 72, 239-247, 1999.01.
178.	Taro Tsubomura, Mitsuru Ito, and Ken Sakai, 18-Membered Tetraimino Macrocyclic Complexes Containing Furan Groups; Stacking of Two Macrocycles and Characterization of Organic Derivatives, Inorg. Chim. Acta, 284, 149, 1999.01.
179.	Masami Ito, Yu-saku Takita, Ken Sakai,and , Taro Tsubomura, The Syntheses of (Chloro) Iron(II) Complexes by Using Tridentate Polypyridine Ligands, Chem. Lett., 1185, 1998.01.
180.	Ken Sakai, Masao Takeshita, Yuko Tanaka, Takuma Ue, Masayuki Yanagisawa, Masaya Kosaka, Taro Tsubomura, and Masamichi Ato, A New One-Dimensional Platium System Consisting of Carboxylate-Bridged cis-Diammineplatinum Dimers, J. Am. Chem. Soc., 120, 11353-11363, 1998.01.
181.	Ken Sakai, Yuko Tanaka, Yuriko Tsuchiya, Kentaro Hirata, Taro Tsubomura, Seiichiro Iijima, and Ashis Bhattacharjee, New Structural Aspects of a-Pyrrolidinonate-Bridged and a-Pyridonate-Bridged, Homo- and Mixed-Valence, Di- and Tetranuclear cis-Diammineplatinum Complexes: Eight New Crystal Structures, Stoichiometric 1:1 Mixture of Pt(2.25+)4 and Pt(2.5+)4, New Quasi-One-Dimensional Halide-Bridged [Pt(2.5+)4-Cl・・・]\ System, and Consideration for Solution Propertie, J. Am. Chem. Soc., 120, 8366-8379, 1998.01.
182.	Taro Tsubomura, and Ken Sakai, Photochemical Reactions of Palladium(0) and Platinum(0) Phosphine Complexes, Coord. Chem. Rev., 171, 107-113, 1998.01.
183.	Miho Hashioka, Ken Sakai, and Taro Tsubomura, Bis[m-methylenebis(dicyclohexylphosphine)-P:P']bis[chloropalladium(I)](Pd-Pd) Diacetonitrile Solvate, Acta Crystallogr., C54, 1244-1247, 1998.01.
184.	Taro Tsubomura, Akira Ishikura, Kenta Hoshino, Hiroki Narita, and Ken Sakai, Photochemical C-C Bond Formation from Chlorobenzene Mediated by [Pd(PPh3)4], Chem. Lett., 1171-1172, 1997.01.
185.	Ken Sakai, and Taro Tsubomura, Synthesis, Characterization, and Interaction with DNA of A New Cis-Diamminedichloroplatinum(II)-Derivative Having a Polypyridyl Ruthenium(II) Emitter, J. Inorg. Biochem., 67, 349, 1997.01.
186.	Ken Sakai,Yoshie Ikuta, Meiko Shiomi, Tsuyoshi Tamane, Yasushi Tomita, Taro Tsubomura, and Nobukatsu Nemoto, Syntheses, Structures, and Conformational Studies of N-Carbamoylmethylpyridinium Perchlorate and N-Carbamoylmethyl-N'-methyl-4,4'-bipyridinium Bis(perchlorate) Hydrate, Acta Crystallogr.,, C53, 331-334, 1997.01.
187.	Shigenobu Yano, Tomoko Inagaki, Yasuko Yamada, Masako Kato, Mikio Yamasaki, Ken Sakai, Taro Tsubomura, Mitsunobu Sato, Wasuke Mori, Kazuya Yamaguchi, and Isamu Kinoshita, A Novel Tetranuclear Iron(III) Complex having L-Alanine Bridges and an Unprecedented (Fe4(OH2)) Core, Chem. Lett., 61, 1996.01.
188.	Motowo Yamaguchi, Masayuki Yabuki, Takamichi Yamagishi, Ken Sakai, and Taro Tsubomura, Molecular Structure of 1,3-Disubstituted p-Allyl Palladium(II) Complexes with a Chiral Diphosphine: The Intermediate of Palladium-catalyzed Asymmetric Allylic Alkylation, Chem. Lett., 241-242, 1996.01.
189.	Mitsuru Ito, Tadanobu Sato, Ken Sakai, and Taro Tsubomura, Triple-Decker Sandwich Structure of a New Rubidium(I) Tetraimino Macrocyclic Complex, Chem. Lett., 1996, 619-620, 1996.01.
190.	Ken Sakai, Yasutaka Yamada, and Taro Tsubomura, Syntheses and Crystal Structures of Ruthenium Complexes of 1,4,8,11-Tetraazacyclotetradecane, Tris(2-aminoethyl)amine (tren) and Bis(2-aminoethyl)(iminomethyl)amine. A Microporous Layered Structure Consisting of {[K(tren)]2[RuCl6]}nn- and {(H5O2)4[RuCl6]}nn+, Inorg. Chem., 35, 3163-3172, 1996.01.
191.	Tadanobu Sato, Harumi Takeda, Ken Sakai, and Taro Tsubomura, Novel Two Types of Metal Complexes Derived from Tripod Amines and Acetylacetone, Inorg. Chim. Acta, 246, 413-421, 1996.01.
192.	Tadanobu Sato, Ken Sakai, and Taro Tsubomura, A Cryptand Containing Three Diiminopyridyl Units; Aromatic-Aromatic Interaction and the Stability of the Complexes, Supramol. Chem., 7, 157-165, 1996.01.
193.	Ken Sakai, Yasutaka Yamada, Taro Tsubomura, Masayuki Yabuki, and Motowo Yamaguchi, Synthesis, Crystal Structure, and Solution Properties of a Hexacopper(II) Complex with Bridging Hydroxides, Pyrazolates and Nitrates, Inorg. Chem., 35, 542-544, 1996.01.
194.	Ken Sakai, Tadanobu Sato, Taro Tsubomura, and Kazuko Matsumoto, Di-m-pyrazolato-N:N'-bis[(2,2'-bipyridine-N:N')platinum(II)]　Bis(tetrafluoroborate) Monohydrate, Acta Crystallogr., C52, 783-786, 1996.01.
195.	Ken Sakai, Akira Ishikura, Taro Tsubomura, and Kazuko Matsumoto, Two Different Crystal Forms of cis-Diamminebis(pyrazole)platinum(II) Dinitrate, Acta Crystallogr., C52, 779-783, 1996.01.
196.	Tsuyoshi Tamane, Taro Tsubomura, and Ken Sakai, [MnIII4(m3-O)2(m-O2CMe)7(2,2'-bipyridine)2](ClO4), Acta Crystallogr., C52, 777-779, 1996.01.
197.	Tadanobu Sato, Atsushi Suzuki, Ken Sakai, and Taro Tsubomura, Syntheses and Structures of a Novel Trinaphthylene Hexaimino Cryptand: Three Different Conformations of a Macrobicyclic Ligand, Bull. Chem. Soc. Jpn., 69, 379-388, 1996.01.
198.	Ken Sakai, Yuko Tanaka, and Taro Tsubomura, [N,N'-Bis(2-aminoethyl-N)-N,N'-bis(2-ammonioethyl)ethylenediamine-N,N']platinum(II) Bis(tetrachloroplatinate) Trihydrate, Acta Crystallogr., C52, 541-543, 1996.01.
199.	Hiroshi Tominaga, Ken Sakai, and Taro Tsubomura, Structure and Photophysical Properties of [Pt0(BINAP)2] (BINAP = 2,2'- bis(diphenylphosphino)-1,1'-binaphthyl), J. Chem. Soc., Chem. Commun., 2273-2274, 1995.01.
200.	Masako Kato, Yasuko Yamada, Tomoko Inagaki, Wasuke Mori, Ken Sakai, Taro Tsubomura, Mitsunobu Sato, and Shigenobu Yano, Structures and Magnetic Properties of Iron(III) Dinuclear Complexes with Alkoxo and Carboxylato Bridges, Inorg. Chem., 34, 2645-2651, 1995.01.
201.	Jiro Abe, Yasuo Shirai, Ken Sakai, and Taro Tsubomura, Ab Initio MO and X-ray Studies of Excited States in Molecular Crystals of 4-(b,b-Dicyanovinyl)-3-methyl-N-methyl-N-benzylaniline, J. Phys. Chem., 99, 8108-8120, 1995.01.
202.	Ken Sakai, Taro Tsubomura, and Kazuko Matsumoto, Reactions of an a-Pyrrolidonate-Bridged cis-Diammineplatinum(II) Dimer with Molecular Oxygen and Its Application to the Catalytic O2 Oxidation of Hydroquinone, Inorg. Chim. Acta, 234, 157-161, 1995.01.
203.	Taro Tsubomura, Atsushi Itsuki, Masahiko Homma, and Ken Sakai, Photoreaction of Palladium Phosphine Complex with Chloroalkane. Production of Ethylene with 1,2-Dichloroethane and Novel Photochromic Behavior, Chem. Lett., 661-664, 1994.01.
204.	Tadanobu Sato, Ken Sakai, and Taro Tsubomura, Conformational Change of a Macrobicyclic Complex. Structure of Free Ligand and Interactions with DMSO, Chem. Lett., 859-862, 1993.01.
205.	Ken Sakai, Taro Tsubomura, and Kazuko Matsumoto, Redox Disproportionation Cleavage of an a-Pyrrolidonate-Bridged Mixed-Valent Tetranuclear Platinum Complex, Inorg. Chim. Acta, 213, 11-16, 1993.01.
206.	Ken Sakai, Yukio Kizaki, Taro Tsubomura, and Kazuko Matumoto, Homogeneous Catalysis of Mixed-Valent Octanuclear Platinum Complexes in Photochemical Hydrogen Production from Water, J. Mol. Catal., 79, 141-152, 1993.01.
207.	Ken Sakai, Yuriko Tsuchiya, and Taro Tsubomura, Axial Ligand Substitution Equilibria with Chloride Anion on a-Pyrrolidonate-Bridged cis-Diammineplatinum(III) Dimer, Technol. Rep. Seikei Univ., 54, 77-78, 1992.01.
208.	Taro Tsubomura, Tadanobu Sato, Kouichi Yasaku, Ken Sakai, Kimiko Kobayashi, and Makoto Morita, Synthesis and Characterization of Barium(II) Macrobicyclic Complexes and Related Compounds, Chem. Lett., 731-734, 1992.01.
209.	Kazuko Matsumoto, Ken Sakai, Kyosuke Nishio, Yasuhiro Tokisue, Reikichi Ito, Toshikazu Nishide, and Yushi Shichi, Syntheses, Crystal Structures, and Electronic, ESR and X-Ray Photoelectron Spectra of Acetamidate- and 2-Fluoroacetamidate-Bridged Mixed-Valent Octanuclear Platinum Blues, J. Am. Chem. Soc., 114, 8110-8118, 1992.01.
210.	Masaki Kawano, Chikara Hoshino, Ken Sakai, and Kazuko Matsumoto, Crystal Structure of cis-Bis(acetonitrile)tetrakis(trimethylphosphite)iron(II) Tetrachlorotetrakis(m3-sulfido)tetraferrate(2II,2III), Anal. Sci., 7, 829-830, 1991.01.
211.	Ken Sakai, Kazuko Matsumoto, and Kyosuke Nishio, Crystal Structure of 2-Fluoroacetamidate-Bridged Mixed-Valent Octanuclear Platinum Blue with Average Platinum Oxidation State of 2.08, [Pt8(NH3)16(CH2FCONH)8](NO3)8.66・4H2O, Chem. Lett., 1081-1084, 1991.01.
212.	Ken Sakai, and Kazuko Matsumoto, Homogeneous Catalysis of Platinum Blue Related Complexes in Photoreduction of Water into Hydrogen, J. Mol. Catal., 62, 1-14, 1990.01.
213.	Ken Sakai, and Kazuko Matsumoto, Oxidation of Benzene to Phenol with Hydrogen Peroxide Catalyzed by a-Pyrrolidonate-Bridged Mixed-Valent Tetranuclear Platinum Complexes, J. Mol. Catal., 67, 7-18, 1991.01.
214.	Ken Sakai, and Kazuko Matumoto, Photochemical Reduction of Water to Hydrogen Catalyzed by Mixed-Valent Tetranuclear Platinum Complex, J. Coord. Chem., 18, 169-172, 1988.01.
215.	Ken Sakai, and Kazuko Matsumoto, Mixed-Valent Octanuclear Platinum Acetamide Complex, [Pt8(NH3)16(C2H4NO)8]10+, J. Am. Chem. Soc., 111, 3074-3075, 1989.01.

九大関連コンテンツ

pure2017年10月2日から、「九州大学研究者情報」を補完するデータベースとして、Elsevier社の「Pure」による研究業績の公開を開始しました。

QIR　九州大学学術情報リポジトリシステム情報科学研究院

理学部・理学研究院


	※ 研究者情報全体を検索する場合は右端の「すべて」を選択して下さい。