title: Electron paramagnetic resonance studies of Cu2+ ion in tetraaqua-di(nicotinamide)Ni(II)-saccharinates single crystals.
abstract: X-band (approximately 9.8 GHz) electron paramagnetic resonance (EPR) measurement at ambient temperature in three mutually perpendicular planes have been carried out on a single crystal of Cu2+ doped mixed ligand complex of Ni(II) with saccharin and nicotinamide [Ni(Nic)2(H2O)4](sac)2. The angular dependent spectra showed that the Cu2+ ion enters Ni2+ sites in the lattice and distorted local environment of Ni2+ site. The principal g and A values, covalency parameter (alpha'2), mixing coefficients (alpha and beta) and Fermi contact term (K) have been evaluated from the EPR analysis. The ground-state wave function of the Cu2+ ion has been constructed using the alpha'2, alpha and beta values. The nature of the distortion present in the lattice is obtained from the values of the mixing coefficients.
authors.affiliation: Department of Physics, Faculty of Science, Gebze Institute of Technology, Istanbul Caddesi No 101, 41400 Kocaeli, Gebze, Turkey. yyerli@gyte.edu.tr
authors.forename: Y
authors.initials: Y
authors.lastname: Yerli
authors.forename: S
authors.initials: S
authors.lastname: Kazan
authors.forename: O
authors.initials: O
authors.lastname: Yalçin
authors.forename: B
authors.initials: B
authors.lastname: Aktaş
mesh_terms: D002413:Cations, Divalent; D003300:Copper / Q000737:chemistry*; D003460:Crystallization; D004578:Electron Spin Resonance Spectroscopy; D009532:Nickel / Q000737:chemistry*; D012439:Saccharin / Q000031:analogs & derivatives* / Q000737:chemistry*
chemical_list: D002413:Cations, Divalent; D003300:Copper; D009532:Nickel; D012439:Saccharin