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Mössbauer spectroscopy of  129 I and  197 Au nuclei has been applied for AuI and AgAuI 2  to clarify the electronic structures of the gold and iodine atoms, and to investigate the nature of the Au-I bonds. In the 129I Mössbauer spectra the sign of e 2 qQ is positive for AuI, whereas the sign is negative for AgAuI 2 . This is attributable to the difference in molecular structures: The iodine atom in AuI is bridged by two gold atoms and in AgAuI 2  the iodine is terminal. The  197 Au Mössbauer spectra suggest that the Au-I bond in AgAuI 2  is more covalent than that in AuI. We have revealed that AgAuI 2  consists of Ag +  and linear [I-Au-I] -  units from the Rietveld refinement of the X-ray powder diffraction pattern

I-129 and Au-197 Mössbauer Spectroscopy of AuI and AgAuI 2