High nuclearity clusters of osmium and ruthenium containing the [Au 2(Ph 2PCH 2PPh 2)] 2+ cation; the X-ray structures of [Os 4H 4(CO) 11Au 2(Ph 2PCH 2PPh 2)] and [Ru 10C(CO) 24Au 2(Ph 2PCH 2PPh 2)

Abstract

Treatment of [Os 4H 4(CO) 11] 2−, [Os 10C(CO) 24] 2− and [Ru 10C(CO) 24] 2− with [Au 2(Ph 2PCH 2PPh 2)Cl 2] in the presence of an excess of TIPF 6, gave [Os 4H 4(CO) 11(Au 2Ph 2PCH 2PPh 2)] 1, [Os 10C(CO) 24(Au 2Ph 2PCH 2PPh 2)] 2 and [Ru 10C(CO) 24(Au 2Ph 2PCH 2PPh 2)] 3, respectively, all of which were obtained in high yield. The structures of the clusters l and 3 have been established by X-ray crystallography, both exhibiting novel coordination modes of the bidentate gold fragments. Cluster 1 contains a tetrahedral Os 4 core with one of the Au atoms of the Au 2(Ph 2PCH 2PPh 2) ligand bridging an edge of the tetrahedron, and the second Au atom coordinated to a third Os atom. In 3 the two Au atoms of the Au 2(Ph 2PCH 2PPh 2) ligand cap two adjacent, vertex sharing, triangular faces of the Ru 10 tetracapped octahedral core.