Potassium hexachloropalladate and potassium hexachloroplatinate: a comparative study using nuclear quadrupole resonance

Abstract

Measurements of the temperature dependence of the nuclear quadrupole resonance frequency ν_Q and spin–lattice relaxation time T₁ of the ³⁵Cl nuclei in powdered samples of K₂PdCl₆ are reported. The data are qualitatively similar to earlier results for K₂PtCl₆ and are analyzed in the same manner. The temperature dependence of both ν_Q and T₁ are dominated by the F_1g rotary lattice mode of frequency ~ 41 cm⁻¹. The data for K₂PdCl₆ and K₂PtCl₆ are compared and the parameters characterizing the NQR behavior tabulated. It is suggested that the quantitative explanation of the rather small differences observed might provide a challenging problem for a molecular orbital theorist.