The compound (Et4N)2[Fe4S4(SCH2Ph)4J has been prepared and its structure determined by x-ray diffraction. The Fe4S4 core of the anion possesses a configuration of D2d symmetry that is closely related to the Fe4S4 active-site structures of the high-potential iron protein from Chromatium and the ferredoxin from Micrococcus aerogenes. Electronic properties of the tetrameric anion have been partially characterized by measurement of proton magnetic resonance, Mossbauer, photoelectron, and electronic spectra, and magnetic susceptibility.
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