X-ray absorption spectral studies of copper(II) mixed ligand complexes having ethylenediamine as one of the ligands
| Autor: | V K Hinge, B. D. Shrivastava, K Srivastava, Jagdish Prasad, Shikha Dwivedi, S. K. Joshi |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Journal of Physics: Conference Series. 534:012006 |
| ISSN: | 1742-6596 1742-6588 |
| DOI: | 10.1088/1742-6596/534/1/012006 |
| Popis: | X-ray absorption spectra of copper(II) mixed ligand complexes, having ethylenediamine (en) as one of the ligands, have been recorded at the K-edge of copper at the dispersive extended X- ray absorption fine structure (EXAFS) beamline (BL-8) at the 2.5 GeV INDUS-2 Synchrotron, RRCAT, Indore, India. The samples studied are: Cu(en)2(ClO4)2, Cu(en)2Br2.H2O and Cu(en)2SO4. The data obtained has been processed using EXAFS data analysis program Athena. The K-edge has been found to split in two edges K and K' in each of the complex. The energies of the edges K(EK) and K'(EK') and the principal absorption maximum A(EA) have been determined from the derivative spectra. The chemical shift has been utilized to determine the oxidation state of copper in the complexes and to estimate effective nuclear charge (ENC) on the absorbing atom. The EXAFS data has been used to determine the bond lengths in the complexes using three different graphical methods. The bond lengths, obtained from one of these methods and the Fourier transformation method, are comparable with each other, showing that both of these methods give phase uncorrected bond lengths. |
| Databáze: | OpenAIRE |
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