EPR of Cu~(2+) and VO~(2+) in a cobalt saccharin complex, [Co(sac)_2(H_2O)_4]·2H_2O single crystals

摘要

Cu~(2+) and VO~(2+) doped single crystals of [Co(sac)_2(H_2O)_4]·2H_2O (Cosacaqua) complex were investigated using EPR technique at ambient temperature. Detailed investigation of the EPR spectra indicated that the Cu~(2+) and VO~(2+) substitute the Co~(2+). Two site were observed for Cu~(2+) and VO~(2+). But each site of V~(2+) corresponds two different orientations of VO~(2+). The principal values of the g and the hyperfine tensors were obtained. The spectra indicate that the ground state for Ca~(2+) is mainly 3d_(x~2-y~2). The covalent bonding parameters for Cu~(2+) and VO~(2+) and Fermi contact terms were obtained.