Ligand shift in mixed-cluster complexes: synthesis of alkyne-bridged Co 2Mo 2 clusters with two triply-bridging sulphur atoms: crystal structure of [Co 2Mo 2(η 5-Cp) 2(μ 3-S) 2(μ 4-CF 3C 2Me)(CO) 4

Abstract

Reaction of the complexes [(CO) 3Co(μ-RC 2R′)Co(CO) 3] (R = R′ = CF 3; R = Ph, CF 3 and R′ = H) with the MoMo dinuclear derivative [Mo 2Cp 2(μ-SMe) 2(CO) 2] leads to cleavage of both CS and CH bonds with the formation of closo-octahedral Mo 2CO 2C 2 clusters stabilised by a μ 4-η 2-bound alkyne. An X-ray diffraction study has shown that the two Mo 2Co faces of the octahedron are capped by triply-bridging sulphur atoms.