Infrared polarised spectrum of bis-(dimethyldithiophosphato)nickel(II)

Abstract

The polarisation behaviour of the infrared absorptions of a single crystal of bis-(dimethyldithiophosphato) nickel(II) with (001) as the predominant face is studied. Because only a and b polarisation can be measured on (001), the b 2u and b 3u normal modes, which are polarised on b, cannot be distinguished, whilst the b 1u modes are observed on a. The most characteristic absorptions of the compound are assigned on the basis of the polarisation results. The comparison of the crystal with the solution spectrum indicates that the absorptions at 396 and 357 cm −1 undergo crystal field splitting in the solid.