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    Bis(4-fluorobenzoato)-?2O,O?;?O-(4-fluorobenzoic acid-?O)bis(nicotinamide-?N1)copper(II)
    (Int Union Crystallography, 2011) Necefoglu, Hacali; Ozbek, Fureya Elif; Ozturk, Vijdan; Tercan, Baris; Hokelek, Tuncer
    In the title Cu-II complex, [Cu(C7H4FO2)(2)(C7H5FO2)(C6H6N2O)(2)], the Cu-II cation is coordinated by two N atoms of two nicotinamide (NA) ligands, and by four O atoms from two 4-fluorobenzoate (PFB) anions and one 4-fluorobenzoic acid (PFBA) molecule, in a distorted octahedral geometry. In the molecule, two Cu-O bond lengths are significantly longer than the other two. The dihedral angles between the carboxylate groups and the adjacent benzene rings are 11.08 (14), 7.62 (13) and 5.73 (11)degrees, while the benzene rings are oriented at dihedral angles of 15.62 (6), 33.71 (8) and 26.60 (8)degrees. In the crystal structure, extensive N-H center dot center dot center dot O, C-H center dot center dot center dot F and C-H center dot center dot center dot O hydrogen bonds link the molecules into a three-dimensional network. pi-pi contacts between the benzene rings [centroid-to-centroid distances = 3.5517 (15), 3.8456 (14) and 3.9265 (13) angstrom] further stabilize the crystal structure.
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    Diaquabis(4-bromobenzoato-?O)bis(nicotinamide-?N1)copper(II)
    (Wiley-Blackwell, 2011) Necefoglu, Hacali; Ozbek, Fureya Elif; Ozturk, Vijdan; Tercan, Baris; Hokelek, Tuncer
    The asymmetric unit of the title mononuclear Cu-II complex, [Cu(C7H4BrO2)(2)(C6H6N2O)(2)(H2O)(2)], contains one half-molecule, the Cu-II atom being located on an inversion center. The unit cell contains two nicotinamide (NA), two 4-bromo-benzoate (PBB) ligands and two coordinated water molecules. The four O atoms in the equatorial plane around the Cu-II ion form a slightly distorted square-planar arrangement, while the slightly distorted octahedral coordination is completed by the two N atoms of the NA ligands in the axial positions. The dihedral angle between the carboxylate group and the adjacent benzene ring is 22.17 (16)degrees, while the pyridine ring and the benzene ring are oriented at a dihedral angle of 82.80 (6)degrees. In the crystal, N-H center dot center dot center dot O, 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. A weak C-H center dot center dot center dot pi interaction is also observed.
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    Poly[[diaquamanganese(II)]-bis(?-4-fluorobenzoato-?2O:O?)]
    (Int Union Crystallography, 2011) Necefoglu, Hacali; Ozbek, Fureya Elif; Ozturk, Vijdan; Tercan, Baris; Hokelek, Tuncer
    In the crystal structure of the title complex, [Mn(C7H4FO2)(2)-(H2O)(2)](n), the Mn-II atom is located on an inversion centre. It is coordinated by two water molecules in the apical directions and four 4-fluorobenzoate (PFB) anions, bridging the symmetry related Mn atoms in the basal plane to form an infinite two-dimensional polymeric structure parallel to (100). The four O atoms of the PFB anions around the Mn-II atom form a slightly distorted square-planar arrangement, while the slightly distorted octahedral coordination is completed by the two O atoms of the water molecules. The dihedral angle between the carboxylate group and the adjacent benzene ring is 27.29 (16)degrees. The O-H center dot center dot center dot O hydrogen bonds further connect the manganese-carboxylate units. pi-pi contacts between the benzene rings [centroid-centroid distance = 3.6894 (15) angstrom] further stabilize the crystal structure.