Study on Chemical Bond and Electronic State of New Gold Mixed Valence Complexes Cs2[AuIX2][AuIIIY4] (X, Y=Cl, Br, I) by Means Of197au Mössbauer Spectroscopy

Cs2[AuIX2][AuIIIX4] (X=Cl, Br, I) is known for a perovskite-type gold mixed-valence system. We have synthesized new gold mixed valence complexes, Cs2[AuIX2][AuIIIY4] (X, Y=Cl, Br, I), which was proved by means of Raman spectroscopy. From the analysis of 197Au Mössbauer spectra, it was elucidated that the charge transfer between \(Au^I \left( {5d_{{x^2 - y^2 }} } \right)\) and \(Au^{III} \left( {{5d_{x^2 - y^2 }} } \right)\) becomes to be predominant in the order of Y=ClMore