The reaction of tris(1-benzylimidazole-2-yl)phosphine, (Bzim)3P, 1, with Ph3AsAuCl in 1:1 stoichiometric ratio produced (Bzim)3PAuCl, 2. The reaction of (Bzim)3PAuCl with NaAuCl4 in 1:1 stoichiometry in dichloromethane gives an orange-yellow crystalline tetranuclear gold(I) cluster [{μ-N,N’-(Bzim)3PAuCl}2Au2][AuCl2][AuCl4], 3. Complex [{μ-N,N’-(Bzim)3PAuCl}2Au2][AuCl2]2, 4, is formed when the reaction stoichiometry of (Bzim)3PAuCl and NaAuCl4 is 2:1. The crystal structure of 3 shows the formation of a 12-membered macrocycle with Au•••Au distances of ∼3.0 A°. The structures of (Bzim)3PAuCl and 3 show Au•••H-C interactions ranging from 2.57 to 2.95A°. The interest in tetranuclear gold clusters is due to their potential application as precursors for CO and olefin oxidation, their structural features and the presence of short Au•••Au interactions possibly influencing the optoelectronic properties observed in various polynuclear Au(I) compounds.

Mono and Tetranuclear Gold(I) Complexes of Tris(1-benzylimidazole-2-yl)-phosphine.

BURINI, Alfredo;GALASSI, Rossana;RICCI, SIMONE;
2010

Abstract

The reaction of tris(1-benzylimidazole-2-yl)phosphine, (Bzim)3P, 1, with Ph3AsAuCl in 1:1 stoichiometric ratio produced (Bzim)3PAuCl, 2. The reaction of (Bzim)3PAuCl with NaAuCl4 in 1:1 stoichiometry in dichloromethane gives an orange-yellow crystalline tetranuclear gold(I) cluster [{μ-N,N’-(Bzim)3PAuCl}2Au2][AuCl2][AuCl4], 3. Complex [{μ-N,N’-(Bzim)3PAuCl}2Au2][AuCl2]2, 4, is formed when the reaction stoichiometry of (Bzim)3PAuCl and NaAuCl4 is 2:1. The crystal structure of 3 shows the formation of a 12-membered macrocycle with Au•••Au distances of ∼3.0 A°. The structures of (Bzim)3PAuCl and 3 show Au•••H-C interactions ranging from 2.57 to 2.95A°. The interest in tetranuclear gold clusters is due to their potential application as precursors for CO and olefin oxidation, their structural features and the presence of short Au•••Au interactions possibly influencing the optoelectronic properties observed in various polynuclear Au(I) compounds.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11581/225681
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