Acta Cryst. (2009). E65, m1330-m1331  [ doi:10.1107/S1600536809040392 ]

Tetraaquabis(nicotinamide-N¹)nickel(II) bis(2-fluorobenzoate)

T. Hökelek, H. Dal, B. Tercan, F. E. Özbek and H. Necefoglu

Abstract: The asymmetric unit of the title complex, [Ni(C₆H₆N₂O)₂(H₂O)₄](C₇H₄FO₂)₂, contains one-half of the complex cation with the Ni^II atom located on an inversion center, and a 2-fluorobenzoate (FB) counter-anion. The four O atoms in the equatorial plane around the Ni atom form a slightly distorted square-planar arrangement with an average Ni-O bond length of 2.079 Å, and the slightly distorted octahedral coordination is completed by the two N atoms of the nicotinamide (NA) ligands in the axial positions. The dihedral angle between the carboxyl group and the attached benzene ring is 28.28 (11)°, while the pyridine and benzene rings are oriented at a dihedral angle of 8.31 (4)°. In the crystal structure, O-HO, N-HO, C-HO, and C-HF hydrogen bonds link the molecules into a three-dimensional network. - Contacts between the pyridine and benzene rings [centroid-centroid distance = 3.626 (1) Å] may further stabilize the crystal structure. The 2-fluorobenzoate anion is disordered over two orientations, with an occupancy ratio of 0.85:0.15.

Online 10 October 2009

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