Research Article: Diaqua­bis(4-methyl­amino­benzoato-κO)bis­(nicotinamide-κN1)nickel(II)

Date Published: May 01, 2009

Publisher: International Union of Crystallography

Author(s): Tuncer Hökelek, Hakan Dal, Barış Tercan, Özgür Aybirdi, Hacali Necefoğlu.


The title NiII complex, [Ni(C8H8NO2)2(C6H6N2O)2(H2O)2], is centrosymmetric with the Ni atom on an inversion center. The mol­ecule contains two 4-methyl­amino­benzoate (MAB) and two nicotinamide (NA) ligands and two coordinated water mol­ecules, all ligands being monodentate. The four O atoms in the equatorial plane around the Ni atom 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 2.09 (14)°, while the pyridine and benzene rings are oriented at a dihedral angle of 66.15 (4)°. In the crystal structure, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network.

Partial Text

For general background to transition metal complexes with biochemically active ligands, see: Antolini et al. (1982 ▶); Bigoli et al. (1972 ▶); Nadzhafov et al. (1981 ▶); Shnulin et al. (1981 ▶); Krishnamachari (1974 ▶). For related structures, see: Hökelek et al. (1995 ▶, 1997 ▶, 2007 ▶, 2008 ▶); Hökelek & Necefoğlu (1996 ▶, 1997 ▶, 2007 ▶).




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