EPR of Cu2+ and VO2+ in a Cobalt Saccharin Complex, [Co(sac)2(H2O)4]·2H2O, Single Crystals

Abstract

Cu2+ and VO2+ doped single crystals of [Co(sac) <inf>2</inf>(H<inf>2</inf>O)<inf>4</inf>]·2H<inf>2</inf>O (Cosacaqua) complex were investigated using EPR technique at ambient temperature. Detailed investigation of the EPR spectra indicated that the Cu2+ and VO 2+ substitute the Co2+. Two sites were observed for Cu2+ and VO2+. But each site of V4+ corresponds two different orientations of VO2+. The principal values of the g and the hyperfine tensors were obtained. The spectra indicate that the ground state for Cu2+ is mainly 3d<inf>x2-y2</inf>. The covalent bonding parameters for Cu2+ and VO2+ and Fermi contact terms were obtained. © 2003 Éditions scientifiques et médicales Elsevier SAS. All rights reserved.