X-ray absorption near edge structure studies of some mixed ligand cobalt(II) complexes

Abstract

X-ray K-absorption spectra of some structurally important cobalt(II) mixed ligand complexes have been recorded using a Cauchois type bent crystal X-ray spectrograph of 0.4 m radius. The complexes investigated in the solid state have EDTA as a primary ligand and chloride, bromide, acetate, nitrite, dinitrite, thiosulphate, glycinate, ethylenediamine and di(ethylenediamine) ions as the secondary ligands. The observed X-ray absorption parameters e.g. chemical shift, edge-width, shift of the principal absorption maximum and white line have been utilised to interpret the structure of the complexes. The results have been discussed qualitatively in terms of molecular symmetry, nature of the ligand and ionicity of the complexes.