CLUSTER CHEMISTRY .62. PREPARATION OF THE HEPTANUCLEAR CLUSTERS RU5M2(MU-5-C2PPH2)(MU-PPH2)(CO)12(PPH3)2 (M = AG, AU) - X-RAY STRUCTURE OF AU2RU5(MU-5-C2PPH2)(MU-PPH2)(CO)11(PPH3)2(P(OET)3)

The heptanuclear title complex was obtained from reactions between Ru5(μ5-C2PPh2)(μ-PPh2)(CO)13 and a mixture of [O{Au(PPh3)}3][BF4] and [ppn] [M(CO)n (M = Co, n = 4; M = Mn, n = 5) or by reduction (Na/Hg or K[HBBu83]) of the Ru5 complex and treatment with AuCl(PPh3); the silver analogue was made by the latter route. The structure of a P(OEt)3 derivative of the Au2Ru5 cluster was determined. The metal core consists of an Ru/AuRu2/Au trigonal bipyramid, two edges of which are bridged by Ru atoms. Addition of the Au2(PPh3)2 unit has resulted in cleavage of one of the Ru‒Ru bonds present in the original Ru5 cluster. Au2Ru5(μ5-C2PPh2)(μ-PPh2)(CO)11(PPh3)2{P(OEt)3} is triclinic, space group P1, with a = 14.031 (15) Å, b = 16.741 (4) Å, c = 18.721 (6) Å, α = 98.64 (2)°, β = 97.61 (6)°, γ = 98.04 (6)°, and Z = 4; 6848 data were refined to R = 0.0595 and Rw = 0.0617. © 1990, American Chemical Society. All rights reserved.