Development of Novel Metal-Peptide Complexes Mimicking Membrane Enzymes and Their Photocatalytic CO2 Reduction Activity

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05531
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 34010:Inorganic/coordination chemistry-related
• Research Institution: Kansai University
• Principal Investigator: Ishida Hitoshi 関西大学, 化学生命工学部, 教授 (30203003)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 二酸化炭素還元 / 金属錯体 / ペプチド / 光触媒 / ミセル / 人工光合成

Outline of Final Research Achievements

Photocatalytic CO2 reduction have attracted much attention in recent years, but most of these reactions are carried out in organic solvents. From the viewpoint of environmental impact, reactions in water are desired. However, it has been pointed out that the efficiency of electron transfer from the photosensitizer to the catalyst dramatically decreases in water. In this study, we researched the photocatalytic CO2 reduction using the micellar interface as a reaction field. Specifically, the amphiphilic peptide ligands containing a bipyridine-type unnatural amino acid were designed and synthesized. The ruthenium complexes were introduced into the micellar systems as the catalysts. The photochemical CO2 reduction performed by visible light irradiation was examined for the effects of different reaction conditions, such as the structure of the catalytic molecules, the type of micelle, and the pH of the solution.

Free Research Field

錯体化学・光化学

Academic Significance and Societal Importance of the Research Achievements

二酸化炭素還元は、近年の大気中の二酸化炭素濃度増大などの環境問題だけでなく、二酸化炭素の資源化としても重要であり、その社会的意義は大きい。特に、光化学的CO2還元反応を利用した人工光合成の開発は、太陽エネルギーの有効利用にも関連して極めて重要である。
金属錯体を触媒として用いる光化学的CO2還元反応に関する研究は、分子レベルで触媒を設計・合成し、その触媒活性・耐久性などの構造相関に関する情報を得られる点で重要である。本研究のように、触媒として十分な活性をもっていても、電子移動効率を向上させる分子設計指針が知られていないことなどから、その学術的意義は高い。