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EPR investigation of two Cu(II) complexes with low symmetry

I. B. COZAR1, L. SZABO1, L. MOGONEA1, O. COZAR1,* , L. DAVID1

Affiliation

  1. Babes-Bolyai University, Faculty of Physics, 400084 Cluj-Napoca, Romania

Abstract

The results of the solvent effects on the Cu(II)-bis(8-hydroxyquinolinate) (Cu(8HQ)2) and Cu(II)-bis (monothiodibenzoylmethanate) (Cu(DBMS)2) complexes obtained by EPR spectroscopy are presented. Assuming the D2h symmetry with 2 2 x y d − orbital as ground state for paramagnetic electron, all the MO coefficients for the metal-ligand bonds are estimated by using Buluggiu formalism. A strong anisotropy of the covalence degree in the ground state A (x y ) 2 2 g Ψ − of both investigated compound, Cu(8HQ)2 and Cu(DBMS)2 was evidenced (α׳2 /α" 2 ≥ 2). Both in plane σ and π bonds are more covalent in the case of Cu(DBMS)2 compound than in Cu(8HQ)2. The out-of-plane π bonds have practically an ionic character in the fist compound with some differences between Cu-O and Cu-N bonds. The ionic character of these π bonds is diminished in the case of Cu(DBMS)2 and Cu-S bond is more covalent than Cu-O..

Keywords

EPR, Cu(II)-(8–hydroxyquinolinate), -(monothiodibenzoylmethanate), Biomedical.

Submitted at: July 21, 2010
Accepted at: Aug. 12, 2010

Citation

I. B. COZAR, L. SZABO, L. MOGONEA, O. COZAR, L. DAVID, EPR investigation of two Cu(II) complexes with low symmetry, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 8, pp. 1799-1804 (2010)