Abstract
X-ray absorption near edge structure (XANES) measurements on K-edges of copper have been made on some mixed ligand copper(II) complexes, namely, MR1=Cu-tryptophan-tyrosine; MR2=Cu-phenylalanine-tyrosine; MR2=Cu-phenylalanine-tryptophan and MR4=Cu-phenylalanine -histidine. All these ligands are biologically important and are essential amino acids. Our studies establish the order of covalency as MR1 > MR4 > MR3 > MR2. The geometry and environment in the first coordination sphere remains the same in all the systems under investigation. The changes in the values of edge-widths and other X-ray absorption parameters obtained in our studies show that a systematic change in the ligand changes the covalency. It is observed that the mixed ligands which are not the part of first coordination sphere are also important in influencing the charge content on the central metal ion. The shifts in the principal absorption maximum suggest oxidation state +2 in these complexes. The splitting of the principal absorption maximum has been interpreted.
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