Spectroscopy at very high pressures. Part III. Raman spectra of complexes M2I[PtCl6] and the relation of symmetry species to pressure-sensitivity

Abstract

The first systematic Raman study of inorganic complexes using a diamond anvil high-pressure cell is reported. It is shown that the pressure-sensitivity of the ν(Pt–Cl) modes in M₂^I[PtCl₆](M^I= K, Rb, Cs, Tl, NH₄), decreases in the order A_1g > E_g > T_1u and this is correlated with the nature of the atom displacements. A probable phase change has been located in Tl₂[PtCl₆].