Abstract
The bands measured in the infrared and Raman spectra in the range 400-70 cm −1 for halogenated platinum (II) and palladium (II) complexes of the type ML 2X 2 (X = Cl, Br, I) may be assigned to vibrational modes of the square planar skeleton. Known complexes together with several new compounds were obtained when ligand L represented pyridine and substituted pyridines. It is shown that the basicity of the ligand, its Hammet factor, and its mass are not solely responsible for the frequency shifts observed. Mixed vibrational modes and molecular interactions in the solid appear to have a decisive effect.
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