Spectroscopic characterization of some Cu(II) complexes
3-hydroxy-4-methoxy benzaldehyde semicarbazone (HMBS) is a biologically active compound which has several potential donor sites. This compound has been used for complexation with Cu(II) ions to synthesize complexes of general formula [Cu(HMBS){sub 2}X{sub 2}] where X is Cl{sup −}, NO{sub 3}{sup −} and CH{sub 3}COO{sup −}. Cu(II) is a d{sup 9} system for which {sup 2}D term is generated. Under O{sub h} symmetry, this term splits into {sup 2}E{sub g} and {sup 2}T{sub 2g}. the ground term {sup 2}Eg is doubly degenerate and hence suffers strong Jahn-Teller effect and accordingly the further splitting of terms occur to lower the symmetry from perfect O{sub h}. Here, the ligand occupies four planar positions while the two axial positions have been varied by using different ions like Cl{sup −}, NO{sub 3}{sup −} and CH{sub 3}COO{sup −}. These variations on the axial positions also add to the distortion in O{sub h} symmetry. Under strong distortion, the electronic spectral band splits into multiplets exhibiting tetragonal distortion in complexes. The extent of distortion has been derived by the derivation of the two radial parameters D{sub s} and D{sub t} from electronic spectral bands. The ESR spectra of complexes reveal the real position of the only unpaired electron of the d{sup 9} system in complexes.
- OSTI ID:
- 22308021
- Journal Information:
- AIP Conference Proceedings, Vol. 1620, Issue 1; Conference: Optics 14: International conference on optics: Light and its interactions with matter, Calicut, Kerala (India), 19-21 Mar 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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