X-ray K-absorption spectral studies of some copper (II) mixed ligand complexes with glycine as primary ligand

Abstract

X-ray K-absorption spectra of some structurally important copper (II) mixed ligand complexes have been recorded using a Cauchois type bent crystal X-ray spectrograph of 0.4m radius. The spectra have been recorded using both solid complexes as well as their aqueous solutions. The observed X-ray absorption parameters e.g., chemical shift, edge-width, shift of the principal absorption maximum and structure of the K-edge have been used to explain the structure of the complexes and also these parameters have been correlated with chemical studies. The changes in the structure of the complexes as they form aqueous solutions have also been interpreted in terms of the X-ray absorption parameters. Further the average metal-ligand bond distances have been estimated from the extended X-ray absorption fine structure (EXAFS). It has been found that the average metal-ligand bond distance increases in the aqueous solution state as compared to that in the solid state.