The oxygen-evolving complex (OEC) of photosystem II is a Mn4CaO5 heterometallic cluster. In the past, we synthesized a structural model (1 ) of the Mn3CaO4 subsite of the OEC using a hexapyridyl, trialkoxide ligand. Addition of the fourth, dangling manganese has been targeted to more fully mimic the structure of the OEC. The original complex 1 , stabilized across three faces of the cubane by carboxylates, has been desymmetrized using a chelating bisoximate ligand by replacing two of the ?2-carboxylates. The properties and reactivity of the desymmetrized Mn3CaO4 complex has been compared to the original, pseudo-C3 symmetric cluster, and its redox and acid/base chemistry has been studied, as both are pertinent to the OEC mechanism. Strategies for synthesizing a Mn4CaO-n(n=4,5) OEC model from the new, desymmetrized complex will be discussed.

Synthetic strategies towards a Mn<sub>4</sub>CaO<sub>n</sub> model complex of the oxygen-evolving complex of photosystem II

248th National Meeting (2014)

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Synthetic strategies towards a Mn4CaOn model complex of the oxygen-evolving complex of photosystem II

Synthetic strategies towards a Mn₄CaO_n model complex of the oxygen-evolving complex of photosystem II