Bonding in d¹⁰ transition metal complexes. IV. Infrared, Raman and N.Q.R. studies of some dihaloaurate(I) complexes

Abstract

The infrared and Raman spectra of bis(N,N-dibutyldithiocarbamato)gold(111) dichloroaurate(1), [(Bu₂NCS₂)₂AU] AuCl₂, and the corresponding bromo and iodo compounds have been measured, and the anion vibrational frequencies assigned. The results are compared with those for other MX₂- ions (M = Cu, Ag; X = C1, Br, I). The chlorine n.q.r. frequencies for the above-named compound, and the corresponding tetraalkylammonium salts, [R₄N] AuCl₂ (R = Et, Bu), have also been measured. A Townes and Dailey analysis of the results indicates an ionic character of about 68% for the Au-Cl bond in the AuCl₂- ion, and a net charge of about + 0.36e on the Au atom. These results are compared with those for some related metal halide complexes.