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Synthetic manganese-calcium cluster similar to the catalyst of Photosystem II: Challenges for biomimetic water oxidation

Abstract

Herein, we report the synthesis, characterization, crystal structure, density functional theory calculations, and water-oxidizing activity of a pivalate Mn-Ca cluster. All of the manganese atoms in the cluster are Mn (IV) ions and have distorted MnO6 octahedral geometry. Three Mn(IV) ions together with a Ca(II), and four-oxido groups form a cubic Mn3CaO4 unit which is similar to the Mn3CaO4 cluster in the water-oxidizing complex of Photosystem II. Using scanning electron microscopy, transmission electron microscopy, energy dispersive spectrometry, extended X-ray absorption spectroscopy, chronoamperometry, and electrochemical methods, a conversion into man-sized Mn-oxide is observed for the cluster under water-oxidation reaction.

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Supplementary files

Article information


Submitted
13 Feb 2020
Accepted
19 Mar 2020
First published
19 Mar 2020

Dalton Trans., 2020, Accepted Manuscript
Article type
Paper

Synthetic manganese-calcium cluster similar to the catalyst of Photosystem II: Challenges for biomimetic water oxidation

Y. Mousazadeh, M. R. Mohammadi, R. Bagheri, R. Bikas, P. Chernev, Z. Song, T. Lis, M. Siczek, N. Noshiranzadeh, S. mebs, H. Dau, I. Zaharieva and M. M. Najafpour, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/D0DT00536C

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