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X‐ray absorption fine structure studies of some copper(II) mixed‐ligand complexes with glutamic acid as primary ligand
Author(s) -
Katare R. K.,
Joshi S. K.,
Shrivastava B. D.,
Patel R. N.,
Pandeya K. B.,
Mishra A.
Publication year - 2002
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.578
Subject(s) - chemistry , copper , extended x ray absorption fine structure , benzimidazole , imidazole , crystallography , ligand (biochemistry) , valence (chemistry) , pyridine , absorption (acoustics) , ion , inorganic chemistry , stereochemistry , absorption spectroscopy , materials science , medicinal chemistry , organic chemistry , receptor , biochemistry , physics , quantum mechanics , composite material
X‐ray absorption fine structure studies at the K‐absorption edges of four mixed‐ligand copper(II) complexes with glutamic acid as primary ligand were carried out. The secondary ligands used in the complexes were water (H 2 O), pyridine (py), imidazole (imH) and benzimidazole (bz‐imH). It was observed that none of these complexes show any splitting of the K‐edge, indicating that the complexes exist in a single valence state of copper atom i.e. +2. The basic dependence of chemical shift ΔE on effective nuclear charge Z eff of the central metal ion was utilized to explain the linear variation of the EXAFS bonding parameter α 1 with effective nuclear charge Z eff by introducing systematic changes in the secondary ligands in the complexes. This finding was further substantiated by plotting α 1 against bond distance. Copyright © 2002 John Wiley & Sons, Ltd.