Vibrational spectroscopy of complex compounds of gold pentafluoride

IR and Raman spectra of X⁺ AuF₆ ^? (X=CIF₂, CIO₂, CIOF₂, CIF₄, CIF₆) were studied. The vibration frequencies of these compounds in the solid phase and in solutions in anhydrous HF were assigned. Peculiar features of the vibrational spectra of solid X⁺ AuF₆ ^?, associated both with structural transformations of cations and anions in the crystal lattice field and cation—anion interactions and also with the Jahn—Teller effect, Fermi resonance, non-rigid intramoleciular rearrangements.,etc., were discussed.