The synthesis of Os3Pt clusters. X-ray crystal structure of Os3Pt(CO)11(PPh3)2

The new clusters Os3Pt(CO)11L2, where L=PPh3 or PtBu2Ph, have been obtained as major products of the reaction of Os3(CO)11(NCMe) with sources of PtL2. A single crystal X-ray crystallographic investigation of the structure where L=PPh3 indicates that the molecules consist of an equilateral triangle of osmium atoms, one edge of which is bridged by a PtL fragment. A second phosphine ligand occupies an equatorial site on the unique osmium atom. Each Os-Pt edge is bridged by a carbonyl ligand, while the remaining nine carbonyl ligands are terminally bound to osmium atoms. The minor products from the reaction of Os3(CO)11(NCMe) and PtL2 are phosphine-substituted derivatives of Os3(CO)12 and the raft clusters Os6(CO)21−n(NCMe)n, (n=1,2).