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10/15 - Seminar (inorganic): Theodore Agapie, Cal Tech http://agapie.caltech.edu

Theodore Agapie - speaker's website
Department of Chemistry
Cal Tech
Host: Paul Chirik

Synthetic Cluster Models of Biological and Heterogeneous Oxygen Evolving Catalysts

Redox-inactive metals are found in biological and heterogeneous water oxidation catalysts, but their roles are currently not well understood. Targeting synthetic model clusters of these catalysts, triphenylbenzene moieties appended with pyridine and alkoxide donors were utilized as multinucleating ligands for first-row transition metals. Complexes of Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+ were synthesized and found to display trinuclear cores supported by bridging alkoxides. Trimanganese complexes were used as precursors for more elaborate metal oxide clusters. Tetranuclear complexes displaying Mn4, Mn3Ca and other Mn3M motifs (M=Na+, Sr2+, Zn2+, Sc3+, Y3+) with varied number of bridging oxo ligands were prepared and studied. A significant variation of reduction potentials on the nature of the redox inactive metal was observed. Implications to the function of the oxygen evolving complex of photosystem II and synthetic oxygen production catalysts will be discussed.