Novel linkage of two molecules of phenylacetylene in an osmium cluster compound: molecular structure of µ3-(4–6-η-2,5-diphenyl-3-oxahexa-1,5-diene-1,4,6-triyl)-µ-carbonyl-octacarbonyl-triangulo-triosmium(3-Os–Os)

Abstract

The molecular structure of the title compound obtained from the reaction of Os₃(CO)₁₂ with phenylacetylene reveals the unique feature of two alkyne molecules linked through a carbon and an oxygen atom derived from opening of the CO bond of a carbonyl group; two five-membered rings are formed with σ and π bonds to the Os₃ cluster, and a highly asymmetrical bridging carbonyl group is present.