title: Synthesis, crystal structure, EPR spectra of doped VO(2+) and Cu(2+) ions in [Zn(ethylisonicotinate)(2)(H(2)O)(4)].(sac)(2) single crystal.
abstract: The tetraaquabis(ethylisonicotinate)zinc(II) disaccharinate, [Zn(ein)(2)(H(2)O)(4)].(sac)(2) (ZENS) (ein: ethylisonicotinate and sac: saccharinate) complex has been synthesized and its crystal structure has been determined by X-ray diffraction analysis. The magnetic environments of VO(2+) and Cu(2+) doped Zn(II) complex have been identified by electron paramagnetic resonance (EPR) technique. The title complex crystallizes in monoclinic system with space group P2(1)/c, Z=4. The octahedral Zn(II) ion, rides on a crystallographic centre of symmetry, is coordinated by two monodentate ein ligands through the ring nitrogen and four aqua ligands to form discrete [Zn(ein)(2)(H(2)O)(4)] unit, which captures two saccharinate ions in up and down positions, each through intermolecular hydrogen bonds. Cu(2+) and VO(2+) doped ZENS single crystals have been studied at room temperature in three mutually perpendicular planes. The calculated results of the Cu(2+) and VO(2+) doped in ZENS indicate that Cu(2+) and VO(2+) ion substitute with the Zn(2+) ion in the host lattice. The angular variations of the EPR spectra have shown that two different Cu(2+) and VO(2+) complexes are located in different chemical environments, and each environment contains two magnetically inequvalent Cu(2+)and VO(2+)sites in distinct orientations occupying substitutional positions in the lattice and show very high angular dependence. The ground state wave functions of the unpaired electron of Cu(2+) ion have been constructed and type of the distortion has, then, been determined.
authors.affiliation: Department of Physics, Ondokuz Mayis University, Kurupelit, 55139 Samsun, Turkey. iucar@omu.edu.tr
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Uçar
mesh_terms: D003300:Copper / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D007477:Ions / Q000737:chemistry*; D008968:Molecular Conformation; D009525:Niacin / Q000737:chemistry*; D017968:Vanadium Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D007477:Ions; D017968:Vanadium Compounds; D017967:Zinc Compounds; D009525:Niacin; D003300:Copper