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Issue 22, 2010
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Gold(I) halide complexes of bis(diphenylphosphine)diphenyl ether ligands: a balance of ligand strain and non-covalent interactions

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Abstract

A series of bis(gold(I) halide; halide = Cl, Br, I) complexes of di(phosphino)diphenyl ether derivatives (L = DPEphos, DBFphos, Xantphos, tBuXantphos) have been synthesized. The new complexes have been characterized by X-ray crystallography, multinuclear NMR, and elemental analysis. The compounds luminesce at room temperature in dichloromethane solution. Many such complexes undergo aurophilic Au⋯Au bonding, and have chiral structures as a result. In complexes of the tBuXantphos ligand, X-ray crystallography indicates that an ion pair forms where the diphosphine ligand chelates one gold atom, and the other is part of an [AuX2] counterion (X = Cl, Br, I). It appears that the observed conformations of the metal-coordinated ligands are a balance of ligand strain and non-covalent interactions, including aurophilicity, intramolecular π-stacking, halide-halide repulsion, and intramolecular Au–O interactions. Together with previous investigations, this research shows that Xantphos and its derivatives form a robust set of coordination complexes with gold that are stable in air and amenable to further synthetic manipulation. It is anticipated that these materials will be suitable precursors for gold-carbon coupling reactions and gold-based catalysis.

Graphical abstract: Gold(i) halide complexes of bis(diphenylphosphine)diphenyl ether ligands: a balance of ligand strain and non-covalent interactions

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Publication details

The article was received on 05 Oct 2009, accepted on 13 Apr 2010 and first published on 06 May 2010


Article type: Paper
DOI: 10.1039/B920717A
Citation: Dalton Trans., 2010,39, 5388-5397
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    Gold(I) halide complexes of bis(diphenylphosphine)diphenyl ether ligands: a balance of ligand strain and non-covalent interactions

    D. V. Partyka, J. B. Updegraff III, M. Zeller, A. D. Hunter and T. G. Gray, Dalton Trans., 2010, 39, 5388
    DOI: 10.1039/B920717A

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