Abstract

The absorption spectra of a number of alkali salts of platinum metal halide complexes have been investigated using a vacuum far-infrared spectrometer. Lattice vibrations and the stretching and bending frequencies of the metal-halogen bonds have been observed in the range 40–360 cm −1. The compounds, which are of the type R 2 XY 4 (square planar anion), were examined both at room temperature and at liquid nitrogen temperature. The assignment of the normal modes has been made and the force constants of the vibrational motions have been calculated using a valence force field model.

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