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http://dx.doi.org/10.5012/jkcs.2011.55.4.603

Synthesis, Characterization and ESR Studies of New Copper(II) Complexes of Vicinal Oxime Ligands  

El-Tabl, Abdou S. (Department of Chemistry, Faculty of Science, Menoufia University)
Shakdofa, Mohamad M.E. (Inorganic Chemistry Department, National Research Center)
El-Seidy, Ahmed M.A. (Inorganic Chemistry Department, National Research Center)
Publication Information
Journal of the Korean Chemical Society / v.55, no.4, 2011 , pp. 603-611 More about this Journal
Abstract
Ethoxylacetyl oxime ligands [HL, (1) and $H_2L^1$, (3)] react with copper(II) acetate monohydrate yield octahedral and square planar complexes, respectively. The complexes have been postulated due to elemental analyses, IR, UVVis. spectra, magnetic susceptibility, conductivity and ESR spectra. Molar conductance of the complexes in DMF indicates a non-ionic character. The ESR spectra of [$(L)_2Cu(H_2O)_2$], (2) complex at room temperature and 77K are characteristic of an axial symmetry ($d_{x2-y2}$) with covalent bond character and have a large line width typical of dipolar interactions. However, [$(L^1)Cu$], (4) complex in the solid state showed spectra of marked broadening and loss of hyperfine splitting confirming spinexchange interactions between the copper(II) sites. The spectrum of the doped copper(II) complex at room temperature showed super-hyperfine splitting from coordinated nitrogen atoms and it has an axial type ($d_{x2-y2}$) with covalent bond character and an essentially square-planar arrangement around the copper(II) ion. The spectrum of [$(L^1)Cu$], (4) in frozen methanol at 77K was characteristic of the triplet state of a dimer species and the distance found between the two copper(II) centers was calculated and is equal to 4.8 ${\AA}$.
Keywords
Complexes; Conductivity; Magnetism; Copper(II); Oximes; ESR Spectroscopy;
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