Molybdenum and tungsten diethyldithiocarbamate complexes containing the M2S2(p-S)2 core react with Co2(CO)8 to form, in high yield, the novel "thiocubane" clusters M2Co2^3-S)4(S2CNEt2)2(CO)2-(CH3CN)2 (M = Mo, W). X-ray crystallography shows these clusters to contain a fully metal-metal bonded tetrahedral core as would be predicted from the 60electron count.
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