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    Öğe
    Bis(4-methoxybenzoato)-?2O,O?;?O-bis(nicotinamide-?N1)zinc(II)
    (Wiley-Blackwell, 2010) Hoekelek, Tuncer; Saka, Guener; Tercan, Baris; Tenlik, Erdinc; Necefoglu, Hacali
    The asymmetric unit of the title complex, [Zn(C8H7O3)(2)-(C6H6N2O)(2)], contains three crystallographically independent molecules with similar configurations. The Zn-II cation is coordinated by two N atoms of two nicotinamide ligands and three O atoms from two 4-methoxybenzoate anions in a distorted trigonal-bipyramidal geometry. In each independent molecule, one Zn-O bond distance [2.5181 (12), 2.5931 (12) and 2.4085 (12) angstrom for the three molecules] is significantly longer than the other two. In the crystal structure, extensive N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonding links the molecules into a three-dimensional network. pi-pi contacts between the pyridine rings and between the pyridine and benzene rings [centroid-centroid distances = 3.7655 (9) and 3.8453 (10) angstrom, respectively] further stabilize the crystal structure.
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    Öğe
    Diaquabis(2-bromobenzoato-?O)bis(N,N-diethylnicotinamide-?N1)cobalt(II)
    (Int Union Crystallography, 2010) Hokelek, Tuncer; Saka, Guener; Tercan, Baris; Ozturkkan, Fuereya Elif; Necefoglu, Hacali
    In the mononuclear title compound, [Co(C7H4BrO2)(2)(C10H14N2O)(2)(H2O)2], the Co-II ion is located on a crystallographic inversion center. The asymmetric unit is completed by one 2-bromobenzoate anion, one diethylnicotinamide (DENA) ligand and one coordinated water molecule; all ligands are monodentate. The four O atoms in the equatorial plane around Co-II form a slightly distorted square-planar arrangement, while the slightly distorted octahedral coordination is completed by the two pyridine N atoms of the DENA ligands in axial positions. The dihedral angle between the carboxylate group and the attached benzene ring is 84.7 (1)degrees; the pyridine and benzene rings are oriented at a dihedral angle of 43.64 (6)degrees. In the crystal structure, intermolecular O-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds link the molecules into a three-dimensional network.