Synthetic Mn3Ce2O5‐Cluster Mimicking the Oxygen‐Evolving Center in Photosynthesis

Author:

Chen Yang12ORCID,Su Yao12ORCID,Han Juanjuan3,Chen Changhui1ORCID,Fan Hongjun4ORCID,Zhang Chunxi1ORCID

Affiliation:

1. Beijing National Laboratory for Molecular Sciences and Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

2. University of Chinese Academy of Sciences Beijing 100049 China

3. Center for Physicochemical Analysis and Measurement Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

4. State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Abstract

AbstractThe photosynthetic oxygen‐evolving center (OEC) is a unique Mn4CaO5‐cluster that catalyses water splitting into electrons, protons, and dioxygen. Precisely structural and functional mimicking of the OEC is a long‐standing challenge and pressingly needed for understanding the structure‐function relationship and catalytic mechanism of O−O bond formation. Herein we report two simple and robust artificial Mn3Ce2O5‐complexes that display a remarkable structural similarity to the OEC in regarding of the ten‐atom core (five metal ions and five oxygen bridges) and the alkyl carboxylate peripheral ligands. This Mn3Ce2O5‐cluster can catalyse the water‐splitting reaction on the surface of ITO electrode. These results clearly show that cerium can structurally and functionally replace both calcium and manganese in the cluster. Mass spectroscopic measurements demonstrate that the oxide bridges in the cluster are exchangeable and can be rapidly replaced by the isotopic oxygen of H218O in acetonitrile solution, which supports that the oxide bridge(s) may serve as the active site for the formation of O−O bond during the water‐splitting reaction. These results would contribute to our understanding of the structure‐reactivity relationship of both natural and artificial clusters and shed new light on the development of efficient water‐splitting catalysts in artificial photosynthesis.

Funder

National Natural Science Foundation of China

Chinese Academy of Sciences

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Publisher

Wiley

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