Matrix isolation studies on alkali metal perrhenates: the shape and vibrational assignments of caesium perrhenate, CsReO4

Abstract

The matrix i.r. and Raman spectra obtained from the vaporisation of potassium and caesium perrhenate show spectra characteristic of the molecular species MReO₄ with C_2v symmetry. Additional ¹⁸O enrichment experiments provide an unequivocal assignment for the ν_RC–O modes and it is also shown that the bond dipole model leads to a useful simulation of relative band intensities.