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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(03) [March 2011] >
| Title: | X-ray absorption studies of copper (II) mixed ligand complexes with benzimidazole as one of the ligands |
| Authors: | Hinge, V K
Joshi, S K
Shrivastava, B D
Prasad, J
Srivastava, K |
| Keywords: | Cu K-edge XANES
Cu(II)-benzimidazole complexes |
| Issue Date: | Mar-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | X-ray absorption
near edge structure (XANES) measurements have been made on the K-edge of copper
in some of its biologically important complexes involving benzimidazole (BzImH)
and other inorganic anionic ligands (X), viz; [Cu(BzImH)4X2]
and [Cu(BzIm)2],where X= Cl, Br, 1/2SO4, ClO4,
NO3, and BzIm = benzimidazolato anion. Various X-ray absorption
parameters in the near edge region, such as., chemical shift, i.e., shift of
K-edge of copper in complex with respect to K-edge of copper metal, energy
position of the principal absorption maximum and edge-width have been
estimated. All the complexes have been found to have copper in oxidation state
+2. The shape of the K-edge has been found to show splitting of the K-edge into
two components, i.e., K1 and K2
in all of these complexes. This feature suggests elongated octahedral and
distorted tetrahedral geometries for the complexes which have also been
proposed from the earlier studies. Further, the values of the chemical shift
suggest the relative ionic character of the complexes in the following
sequence: Cu(BzImH)4Br2 < Cu(BzImH)4Cl2<
Cu(BzImH)4SO4 < Cu(BzImH)4(ClO4)2
< Cu(BzImH)4(NO3)2. The edge-widths of the
K-edge also support this relative ionic character. |
| Page(s): | 168-172 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(03) [March 2011]
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