Gold-197 Mössbauer parameters are reported for gold(I) compounds of the type [AuClL] and [AuL2]+(L = tertiary phosphine or arsine), which conform to the previously noted correlations of quadrupole splitting with isomer shift. The parameters clearly distinguish two-co-ordinate [AuClL] from [AuL2]+ and from three-co-ordinate [AuClL2]. Scales of partial isomer shifts and quadrupole splittings are derived, but are of limited use.
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McAuliffe et al. (1977) studied this question.