CLUSTER CHEMISTRY. SYNTHESIS AND X-RAY STRUCTURE OF Os5(μ5-η2, P-C2PPh2)(μ-PPh2)(CO)13, A COMPLEX CONTAINING A PHOSPHINOALKYNE LIGAND ATTACHED TO AN OPEN Os5 CLUSTER

Article abstract of DOI:10.1016/0022-328X(87)83031-0

Reaction of C2(PPh2)2(dppa) with Os3(CO)11(NCMe) affords the yellow complex 2(μ-dppa); this on heating gives 5-η²-P-C2PPh2)(μ-PPh2)(CO)13> in 51percent yield, which is shown by an X-ray study to contain a seven electron donor C2PPh2 ligand interacting with all five Os5 atoms of an open Os5 cluster consisting of three edge fused Os3 triangles with a swallowlike arrangement.The PPh2 group bridges the non fused edge of the central triangle.The structure appears to be identical with that described for the equivalent ruthenium complex.