Abstract
The X-ray absorption spectra at the K-edge of copper have been recorded in five mixed ligand copper complexes having orthophenylenediamine as one of the ligand. Various X-ray absorption near edge structure (XANES) parameters, such as chemical shift, i.e., shift of K-edge of copper in complexes with respect to K-edge of copper metal, energy position of principal absorption maximum and edge-width have been determined. Copper has been found to be in oxidation state +2 in all the complexes. From these XANES data the effective nuclear charge on copper and percentage covalency in these complexes has been estimated.
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