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    Öğe
    A mononuclear, mixed (salicylato) (nicotinamide) complex of Zn(II) with penta- and hexa-coordination sites: A novel framework structure
    (2012) Köse, Dursun Ali; Ay, Ahmet Nedim; Şahin, Onur; Büyükgüngör, Orhan
    The title compound, diaqua(bissalicylato-?O)(bisnicotinamide-?N)zinc(II)][bis(triaqua (monosalicylato-?O)(mononicotinamide-?N)zinc(II)salicylate, includes three Zn(II) ions, four nicotinamide ligands, six salicylate ligands and eight coordinated aqua ligands in the asymmetric unit in complex structure. The geometry around one of the Zn(II) ions is a slightly distorted octahedron, of which the equatorial plane is formed by two carboxylate oxygens and two aqua oxygens, while the axial positions are occupied by two pyridyl nitrogen atoms. The other Zn(II) ions adopt fivefold coordinations with one carboxylate oxygen atom from salicylate ligand, one N atom from nicotinamide ligand and three oxygen atoms from aqua ligands. In addition, there are two salicylate anions in the unit cell that are not coordinated. They provide charge balance as counter-ions in the complex framework.
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    Öğe
    Tetraaquabis(orotato-O)cobalt(II) dihydrate
    (2010) Ay, Ahmet Nedim; Köse, Dursun Ali; Tercan, Barış; Yüksel, Fatma; Hökelek, Tuncer
    In the title CoII complex, [Co(C5H3N 2O4)2(H2O)4]·2H2O, the CoII ion is located on an inversion center and is coordinated by two orotate (2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylate) anions and four water mol-ecules in a slightly distorted octa-hedral geometry. The dihedral angle between the carboxyl-ate group and the attached orotate ring is 1.2 (3)°. In the crystal structure, inter-molecular O - H?O, N - H?O and C - H?O hydrogen bonds link the mol-ecules into a three-dimensional network. ?-? contacts between the orotate rings [centroid-centroid distances = 3.439 (2) and 3.438 (2) Å] further stabilize the structure.