Iron sulfur clusters are widespread in biological systems that perform processes such as nitrogen fixation and photosynthesis. Ferredoxins and Rieske-type [2Fe-2S] clusters function prominently in electron transfer. Rapid electron transfer is dependent on their ability to form multiple stable oxidation states with small reorganization energy. Since correlating the structures and spectroscopy is complicated by the influence of the protein surroundings, the synthesis of symmetric synthetic analogues is useful for uncovering the fundamental properties of the clusters. To date, few synthetic analogues have been studied in multiple oxidation states. Presented here is a �-diketiminate supported [2Fe-2S] clusters that has been characterized in both the diferric and mixed valent states, using crystallography, spectroscopy, and magnetometry. Cyclic voltammetry suggests that the diferrous state is also stable.

�-diketiminate supported mixed valent [2Fe-2S] cluster

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.