The biological site of water oxidation�the oxygen-evolving complex (OEC) of photosystem II�is a Mn4CaO5 heterometallic cluster, proposed to contain a Mn-3CaO4 cubane / open cubane unit with a fourth, dangling Mn bridged to the cubane through two oxido ligands. In past work we synthesized a Mn3CaO4 cubane supported by three acetates and a 1,3,5-triarylbenzene framework containing six pyridines and three alkoxides. More recently, incorporation of a fifth metal center has been targeted to complete the Mn4Ca stoichiometry. A desymmetrized Mn3CaO4 complex has been made with reactivity complementary to the parent, symmetric complex; synthetic strategies from this desymmetrized complex toward more accurate Mn4Ca models of the OEC will be discussed. Redox and acid/base reactivity will also be discussed, as both are relevant to the mechanism of water oxidation.

Strategies for synthesizing Mn<sub>4</sub>CaO<sub>n</sub> models relevant to biological water oxidation

248th National Meeting (2014)

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Strategies for synthesizing Mn4CaOn models relevant to biological water oxidation

Strategies for synthesizing Mn₄CaO_n models relevant to biological water oxidation