Water Oxidation Reaction Catalyzed by Penta-nuclear Complexes Bearing Proton Dissociative Sites

• Project/Area Number: 16H07420
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Inorganic chemistry
• Research Institution: Institute for Molecular Science
• Principal Investigator: Okamura Masaya 分子科学研究所, 生命・錯体分子科学研究領域, 特別訪問研究員 (90782251)
• Project Period (FY): 2016-08-26 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 人工光合成 / 多核金属錯体 / プロトン共役電子移動 / 錯体化学 / 酸素発生反応

Outline of Final Research Achievements

Inspired by natural enzymes, we assumed that the catalyst should have multi-nucler structure and proton dissociative sites to efficiently catalyze multi-electron transfer reactions. In this research project, we investigated penta-nuclear complexes with proton dissociative sites, and found the following two important results.
(I) We succeeded in developing a penta-iron complex that catalyzes water oxidation with the lower overpotential. (II) We successfully synthesized a penta-nuclear metal complex with a confined proton, and demonstrated kinetic proton dissociation from the complex.

Research Products

• [Journal Article] Development of a framework catalyst for photocatalytic hydrogen evolution (2018)
  • Author(s): Chinapang Pondchanok、Okamura Masaya、Itoh Takahiro、Kondo Mio、Masaoka Shigeyuki
  • Journal Title: Chemical Communications Volume: 54 Issue: 10 Pages: 1174-1177
  • DOI: 10.1039/c7cc08013a
  • Peer Reviewed
• [Journal Article] Fe, Ru, and Os Complexes with the Same Molecular Framework: Comparison of Structures, Properties and Catalytic Activities (2017)
  • Author(s): Masaki Yoshida, Mio Kondo, Masaya Okamura, Mari Kanaike, Setsiri Haesuwannakij, Hidehiro Sakurai, and Shigeyuki Masaoka
  • Journal Title: Faraday Discuss. Volume: 印刷中 Pages: 181-196
  • DOI: 10.1039/c6fd00227g
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 酸素発生触媒の開発─金属錯体によるアプローチ (2017)
  • Author(s): 岡村将也, 正岡重行
  • Journal Title: 月刊機能材料 Volume: 37 Pages: 51-59
• [Journal Article] Electrocatalytic Water Oxidation by a Tetranuclear Copper Complex (2016)
  • Author(s): Vijayendran K. K. Praneeth, Mio Kondo, Pei Meng Woi, Masaya Okamura, and Shigeyuki Masaoka
  • Journal Title: ChemPlusChem Volume: 81 Issue: 10 Pages: 1123-1128
  • DOI: 10.1002/cplu.201600322
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] An iron-based catalyst that mimics function of the oxygen-evolving complex (2017)
  • Author(s): Masaya Okamura, Mio Kondo, Reiko Kuga, Yuki Kurashige, Takeshi Yanai, Shinya Hayami, Vijayendran K. K. Praneeth, Masaki Yoshida, Ko Yoneda, Satoshi Kawata, and Shigeyuki Masaoka
  • Organizer: The 6th Asian Conference on Coordination Chemistry (ACCC6)
  • Int'l Joint Research
• [Presentation] 人工光合成の実現を目指した高活性な酸素発生触媒の開発 (2017)
  • Author(s): 岡村将也
  • Organizer: 先端錯体工学研究会 2017年度年会
  • Invited
• [Presentation] A Proton Confined in Pentanuclear Metal Complexes (2017)
  • Author(s): Masaya Okamura, Mari Kanaike, Hitoshi Izu, Chihiro Matsui, Reiko Kuga, Satoshi Kawata, Mio Kondo and Shigeyuki Masaoka
  • Organizer: 錯体化学会第67回討論会
• [Presentation] Water oxidation reaction catalyzed by pentanuclear iron complexes (2017)
  • Author(s): Masaya Okamura, Mio Kondo, Reiko Kuga, Yuki Kurashige, Takeshi Yanai, Shinya Hayami, Vijayendran K. K. Praneeth, Masaki Yoshida, Ko Yoneda, Satoshi Kawata, and Shigeyuki Masaoka
  • Organizer: ICARP2017
  • Int'l Joint Research
• [Presentation] 柔軟なプロトン移動能を有する鉄5核錯体の酸素発生触媒機能 (2016)
  • Author(s): 岡村将也・久我れい子・川田 知・近藤美欧・正岡重行
  • Organizer: 錯体化学会第66回討論会