Solid-state effects and the vibrational spectra of hexahalogeno-stannates(IV) and -tellurates(IV)

Abstract

The vibrational spectra of the mixed phases A₂[(Sn,Te)X₆](A = NH₄, K, Rb, or Cs; X = Cl or Br) are compared with those of the parent hexahalogeno-stannates(IV) and -tellurates(IV). The low intensity of the T_1u bending mode (ν₄) in the spectra of the Te-containing compounds is explained in terms of solid-state effects arising from direct population of delocalised valence-shell bands by the Te^IV non-bonding electrons.