The structural topology of [Mn4(tBuN)7(NMnO3)] (1) and its biomemtic reactivity slightly analogous to the reaction mechanism to proposed S4 state in the OEC of Photosystem II is presented. One frequently cited proposal is the nucleophilic attack by a water hydroxide on a pendant Manganese dioxo moiety, though no chemical example of this reactivity at a manganese cubane cluster has been reported. Here we discuss the explorations of cubane topology of tetra-manganese-nitrogen clusters with a pendant manganese group modelling the oxygen evolving complex (OEC) in photosystem II.

Reactive pendant manganese dioxo in a synthetic structural model of a proposed S4 state in the photosynthetic oxygen evolving complex

ACS Spring 2022

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