The polarized ion model and the bending force constants of the group IIB halides

Abstract

The applicability of the polarized ion model to the bending force constants of the group II metal dihalides is examined. Calculations are carried out for zinc, cadmium and mercury halides and show that the force constant values obtained are insensitive to the anion polarizability values used, but are quite sensitive to the metal ion polarizability values. It is shown that available polarizability values are not applicable to the group II dihalides. Therefore, force constant calculations with the metal ion polarizability as a variable parameter are carried out. Results agreeing with experimental values of the bending force constants are obtained for reasonable polarizability values, except for the case of the mercury halides. This discrepancy is discussed.