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Issue 34, 2015
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1,2,4-Triazole-derived carbene complexes of gold: characterization, solid-state aggregation and ligand disproportionation

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Abstract

Ligand redistribution reactions are well documented for silver(I) N-heterocyclic carbene (NHC) complexes of the type [AgX(NHC)] (X = halido ligand), but only two reports have been described in the literature for gold analogues of the general formula [AuX(NHC)]. In both cases, the NHCs in question were exceptionally strong donors. To probe the dependence of ligand redistribution processes on NHC donor strength, a model study was conducted using a weakly donating 1,2,4-triazolin-5-ylidene (tazy) ligand and different halido coligands. For [AuX(tazy)] (X = Cl, Br, OAc, tazy = 4-benzyl-1-methyl-1,2,4-triazolin-5-ylidene), no ligand redistribution was found, while a reversible disproportionation between [AuI(tazy)] in solution and [Au(tazy)2][AuI2] in the solid state was observed and studied by means of X-ray crystallography, NMR and UV-Vis spectroscopy, as well as DFT calculations.

Graphical abstract: 1,2,4-Triazole-derived carbene complexes of gold: characterization, solid-state aggregation and ligand disproportionation

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Publication details

The article was received on 17 Oct 2014, accepted on 20 Jan 2015 and first published on 20 Jan 2015


Article type: Paper
DOI: 10.1039/C4DT03201B
Citation: Dalton Trans., 2015,44, 15157-15165
  • Open access: Creative Commons BY-NC license
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    1,2,4-Triazole-derived carbene complexes of gold: characterization, solid-state aggregation and ligand disproportionation

    S. Guo, J. C. Bernhammer and H. V. Huynh, Dalton Trans., 2015, 44, 15157
    DOI: 10.1039/C4DT03201B

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