E.s.r. and electrochemical studies of four- and five-coordinate copper(II) complexes containing mixed ligands

ISSN： 0340-4285

Source： Transition Metal Chemistry, Vol.22, Iss.6, 1997-01, pp. : 578-582

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Abstract

Heterocyclic base adducts of salicylaldehyde N(4)- cyclohexylthiosemicarbazone(H2L) copper(II) complexes have been synthesized and characterized. I.r., electronic and e.s.r. spectra of the complexes, as well as i.r., electronic and 1H- and 13C-n.m.r. spectra of the thiosemicarbazone have been obtained. Based on e.s.r. studies, all possible parameters have been calculated. The g values, calculated for all the complexes in frozen solution, indicate the presence of the unpaired electron in the dx2-y2 orbital. The metal–ligand bonding parameters evaluated showed strong in-plane - and in-plane -bonding. The magnetic and spectroscopic data indicate a square-planar geometry for the four-coordinate and a distorted square-pyramidal structure for the five-coordinate complexes. From cyclic voltammetric data quasireversible copper(II)/copper(I) couples are observed for the complexes.