Synthesis, crystal structure, and stereochemical characterization of [Co45-C5Me5)2(CO)42-CO)(µ3-CO)2]: a completely bonding tetrahedral cobalt cluster formed from a cobalt–cobalt multiple-bonded dimer

Abstract
A new type of tetrahedral metal cluster, [Co4(η5-C5Me5)2(CO)4(µ2-CO)(µ3-CO)2](1), has been prepared by the reaction of neutral [Co2(η5-C5Me5)2(µ2-CO)2](2) with dicobalt octacarbonyl as well as by the oxidation of the monoanion of (2) with toluene-p-sulphonic acid in the presence of NaCo(CO)4; a structural analysis by X-ray diffraction revealed that (1) may be viewed, at least conceptually, as an adduct formed by the net insertion of a Co2(CO)4(µ2-CO) fragment across the Co–Co double bond of (2).

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