Gold-197 Mössbauer spectra of organogold(I) compounds
- 1 January 1983
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 9,p. 2071-2074
- https://doi.org/10.1039/dt9830002071
Abstract
Gold-197 Mössbauer parameters are reported for the salts Z[AuR2]{R = C6F5, Z =[NBu4]+, [Ag(C4H8S)]+, [Au(SbPh3)4]+, or [Au(pdma)2]+[pdma =o-phenylenebis(dimethylarsine)]; R = C6F3H2, Z =[NBu4]+, Ag+, or [Ag(C4H8S)]+}. For salts of the same cation, the isomer shift and quadrupole splitting are both slightly smaller for R = C6F5 than for R = C6F3H2, in accord with the electronegativities of the aryl groups. For each anion, the parameters decrease in the order Z =[NBu4]+ > [Ag(C4H8S)]+ > Ag+; this trend probably indicates increasing interionic association. The data for the two gold-containing cations are consistent with four co-ordination; the lower symmetry of [Au(pdma)2]+ is revealed by a small quadrupole splitting. These cations give more intense spectra than the anions, consistent with dependence of the recoil-free fraction on ionic mass.Keywords
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