Gold-197 Mössbauer spectra of some gold–ruthenium cluster compounds

Abstract

The ¹⁹⁷Au Mössbauer spectra of nine cluster compounds containing AuL (L = PPh₃ or ½Ph₂PCH₂PPh₂) and Ru(CO)₃ groups are reported. In three cases, separate signals are resolved for non-equivalent Au(PPh₃) groups within the cluster. Relative intensities of the two sub-spectra are correlated with estimates of the recoil-free fractions of the two types of atom. For the whole series, the isomer shift and quadrupole splitting become smaller as the number of contacts between the gold atoms and their neighbours increases, and the parameters correlate well with the average Au–Ru bond lengths.