Abstract
Infrared and enhanced Raman spectra were recorded of bis(2,3-butanonedioximato-N,N′) nickel (II) and palladium (NiDMG, PdDMG) as well as the i.r. spectra of bis(ethanedialdioximato-N,N′) nickel (II) (NiHG), bis(2,3-pentanonedioximato-N,N′) nickel (II) (NiEMG), and of bis(2,3-butanonedioximato-N,N′) copper (II) (CuDMG). The mutual exclusion of i.r. and Raman active modes of NiDMG and PdDMG prove the existence of an inversion centre whereas the coupling of the in-plane OH deformation with two skeletal modes of CN stretching character indicates that the molecular symmetry is likely to be C 2 h only. The B u OHO stretching mode has been identified in the nickel complexes with a strong, broad band near 900 cm −1. The resonance Raman enhancement is observed mainly with skeletal vibrations of CN character and, less, with those having NO character. The effects of high pressure upon i.r. spectra were observed. The possible symmetry of the hydrogen bond is discussed.
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