Elsevier

Polyhedron

Volume 3, Issues 9–10, 1984, Pages 1093-1097
Polyhedron

The synthesis and x-ray crystal structure of the hexanuclear metal cluster complex [Ir3Pt3(μ-CO)3(CO)3(η-C5Me5)3]

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Abstract

The compounds [Ir(CO)2(η-C5Me5)] and [Pt(C2H4)3] in diethylether at 0°C react to give the cluster complex [Ir3Pt3(μ-CO)3(CO)3(η-C5Me5)3] in quantitative yield. The structure of the hexanuclear metal species was established by X-ray diffraction. The main feature is a near-planar array of metal atoms with a central triangle of platinum atoms [PtPt (mean), 2.703(3) Å] each edge-bridged by an iridium atom [IrPt (mean) 2.667(3) Å]. The iridium atoms are each ligated by an η5-C5Me5 group and by two CO ligands. Three of the latter are essentially terminally bound to Ir and lie approximately orthogonal to the Ir3Pt3 plane, and three bridge between Pt and Ir and lie close to the hexametal plane. The 13C-{1H&} NMR data for the cluster reveal that the carbonyl groups and η5-C5Me5 ligands undergo dynamic behaviour in solution and possible mechanisms for ligand site exchange are discussed.

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