Abstract
The structure of the title compound was originally reported from film data (Brice et al., Inorg Chem 9:362, 1970) and comprises a triangle of cobalt atoms capped by an ethylidyne substituent to form an approximately tetrahedral cluster unit. The triphenylphosphine ligand lies in an equatorial position with respect to the plane of the cobalt triangle. Two carbonyl groups, one axial the other equatorial, complete the coordination sphere of the cobalt atom bound to phosphorus. The other two cobalt atoms each carry two equatorial and one axial carbonyl ligand. The Co–Co bond cis to the phosphine substituent is significantly longer than the other two Co–Co distances. The crystal structure is stabilised by C—H···π interactions and C—H···O hydrogen bonds.
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