XANES and EXAFS studies of some copper (II) mixed-ligand complexes
X-ray K-absorption spectroscopic studies have been carried out on four copper (II) mixed-ligand complexes. The complexes are: I-[Cu(asp)(H2O)2], II-[Cu(asp)(imH)].2H2O, III-[Cu(asp)(py)], IV-[Cu(asp)(bz-imH)].2 H2O, in which aspartic acid has been used as primary ligand and water (H2O), imidazole (i...
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Veröffentlicht in: | Indian journal of pure & applied physics 2002-12, Vol.40 (12), p.908-913 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | X-ray K-absorption spectroscopic studies have been carried out on four copper (II) mixed-ligand complexes. The complexes are: I-[Cu(asp)(H2O)2], II-[Cu(asp)(imH)].2H2O, III-[Cu(asp)(py)], IV-[Cu(asp)(bz-imH)].2 H2O, in which aspartic acid has been used as primary ligand and water (H2O), imidazole (imH), pyridine (py) and benzimidazole (bz-imH) have been used as secondary ligands. Various X-ray absorption parameters e.g., chemical shift, edge-width and shift of the principal absorption maximum have been obtained in the present study. These parameters have been utilized to explain the nature of bonding and structure of the complexes. Further, the observed chemical shifts have been correlated with percentage covalency in these complexes. Average metal-ligand bond distances have also been estimated using EXAFS data. The studies establish significant correlation between various parameters for these complexes. |
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ISSN: | 0019-5596 |