Doubly and triply bridged dihapto phenylethynyl triosmium clusters by oxidative addition of phenylethynyl gold compounds. X-Ray crystal structure of [Os3(CCPh){Au(PMe2Ph)}(CO)10]

Abstract

Oxidative addition of [Au(CCPh)L](L = PPh₃ or PMe₂Ph) to [Os₃(CO)₁₀(MeCN)₂] gives [Os₃(CCPh)(AuL)(CO)₁₀]. The single-crystal X-ray structure for the compound with L = PMe₂Ph shows that the AuL group and the µ,η²-phenylethynyl ligand bridge the same pair of osmium atoms. The Os–Os bond lengths are consistent with AuL being a one-electron donor. Ready decarbonylation occurs in refluxing heptane to give single products formulated as [Os₃(µ₃,η₂-CCPh)(µ-AuL)(CO)₉].