The oxygen evolving complex in Photosystem II contains a multimetallic [Mn4CaO5] active site. Previously, a pseudo-C3 symmetric tris(dipyridyl alkoxide) ligand based on a 1,3,5-triarylbenzene framework was used for the synthesis of trimetallic clusters. Here, substitution of a single dipyridyl alkoxide moiety for a carboxylate moiety leads to the formation of tetrametallic complexes [M4(μ3−OH)] (M = Mn, Fe, Co). Starting from [Mn4(μ3−OH)], pentametallic Mn oxido cluster complexes [M'Mn4O2] incorporating redox inactive metals (M' = Ca+, Sr2+, Y3+, La3+) have been prepared. Structure, redox properties, and spectroscopy of such complexes will be discussed.

Tetranuclear complexes as precursors for the rational design of pentanuclear oxido clusters reminiscent of the oxygen evolving complex in photosystem II

251st National Meeting (2016)

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