The infrared spectra of complexes of transition metal halides with substituted pyridines

Abstract

The infrared spectra, in the region 1600-200 cm^-1, of a series of complexes formed by transition metal halides with substituted pyridines have been recorded. The assignment of the vibrational bands of the ligands and their shifts in frequency on coordination with a metal ion are discussed. A study of the metal-nitrogen stretching frequencies of tetrahedral complexes of the type, MX₂ L₂, where the metal is cobalt or zinc, shows that no simple relationship exists between the magnitude of these frequencies and the nature of either the metal ion or the substituted pyridine ligand.