Vibrational and solid state (CP/MAS) 31P NMR spectroscopic studies of bis(trimethylphosphine)gold(I) halides

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de Silva, EN
Bowmaker, GA
Healy, PC
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2000
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Abstract

The 1:2 AuX/PMe3 (X=Cl,Br,I) complexes have been prepared and studied by infrared, Raman and solid-state cross polarisation magic angle spinning (CP MAS) 31P NMR spectroscopy. The new complex bis(trimethylphosphine)iodogold(I) [AuI(PMe3)2] was prepared by the reaction of [AuI(PMe3)] with PMe3 in dimethylformamide solution. A new method for the preparation of the corresponding bromide complex [AuBr(PMe3)2], from [NBu4][AuBr2] and PMe3, is described. The IR, Raman and CP MAS 31P NMR spectra of the X=Cl, Br compounds are essentially identical, whereas those for X=I show differences that are suggestive of relatively minor differences in the crystal structure relative to the X=Cl, Br compounds. The latter compounds exist as the ionic species [Au(PMe3)2]+X-, and the X=I complex is also essentially ionic, but with a possible weak AuI interaction; this conclusion is supported by the 197Au M泳bauer spectrum of this compound. The solid-state CP MAS 31P NMR spectra of the chloride and bromide complexes consist of doublets due to the presence of 1J(197Au-31P) coupling. This study is the first in which such coupling is observed for the P-Au-P coordination environment. The 1J(197Au-31P) coupling constants are estimated from the doublet splittings.

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Journal of Molecular Structure

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516

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© 2000 Elsevier. Please refer to the journal's website for access to the definitive, published version.

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Physical chemistry

Theoretical and computational chemistry

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