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. 2019 Jun 17;58(25):8504-8509.
doi: 10.1002/anie.201903738. Epub 2019 May 14.

A Gas-Phase Can Mn4-n O4+ Cluster Model for the Oxygen-Evolving Complex of Photosystem II

Silvia Mauthe  1 , Irene Fleischer  1 , Thorsten M Bernhardt  1 , Sandra M Lang  1 , Robert N Barnett  2 , Uzi Landman  2
Affiliations

A Gas-Phase Can Mn4-n O4+ Cluster Model for the Oxygen-Evolving Complex of Photosystem II

Silvia Mauthe et al. Angew Chem Int Ed Engl. .

Abstract

One of the fundamental processes in nature, the oxidation of water, is catalyzed by a small CaMn3 O4 ⋅MnO cluster located in photosystem II (PS II). Now, the first successful preparation of a series of isolated ligand-free tetrameric Can Mn4-n O4+ (n=0-4) cluster ions is reported, which are employed as structural models for the catalytically active site of PS II. Gas-phase reactivity experiments with D2 O and H218 O in an ion trap reveal the facile deprotonation of multiple water molecules via hydroxylation of the cluster oxo bridges for all investigated clusters. However, only the mono-calcium cluster CaMn3 O4+ is observed to oxidize water via elimination of hydrogen peroxide. First-principles density functional theory (DFT) calculations elucidate mechanistic details of the deprotonation and oxidation reactions mediated by CaMn3 O4+ as well as the role of calcium.

Keywords: ab initio calculations; calcium-manganese-oxide cluster; gas-phase reactions; oxygen evolving complex; photosystem II.

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