Abstract
The reactions of [MH3(L)L′][M = Ru, L =η-C5Me5, L′= P(C6H11)31; M = Nb, L = L′=η-C5H4SiMe32; M = Nb, L = L′=η-C5H3(SiMe3)2-1,3 3] with [Au(PPh3)]PF6 produce the trinuclear clusters [L(L′)M(µ-H)2{Au(PPh3)}2]PF6[L =η-C5Me5, L′= P(C6H11)3, M = Ru 4; L = L′=η-C5H4SiMe3, M = Nb 5; L = L′=η-C5H3(SiMe3)2, M = Nb 6]. Complex 1 also reacts with one or two equivalents of [Au{N(SiMe3)2}(PPh3)] to yield respectively the neutral derivatives [(η-C5Me5){(C6H11)3P}Ru(µ-H)2Au(PPh3)]7 and [(η-C5Me5){C6H11)3P}Ru(µ-H){Au(PPh3)}2]8. The same reaction with [NbH3(η-C5H4SiMe3)2] yields the novel hexanuclear raft cluster [Au3Nb3(µ-H)6(η-C5H4SiMe3)6]9. Spectroscopic (IR and NMR) data are provided for all the compounds. Crystals of 9 are triclinic, space group P, with a= 14.927(2), b= 15.083(2), c= 15.632(2)A, α= 103.81(1), β= 99.20(1), γ= 112.55(1)°, and Z= 2. The molecule consists of a central almost equilateral triangle of gold atoms, with each Au–Au bond bridged by a niobium atom which completes its co-ordination sphere with two η-C5H4SiMe3 groups. Additionally, each Au–Nb is bridged by one hydride ligand. The most interesting feature of this molecule is the planarity of the six metal atoms.
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