Received 15 February 2013
In the title complex, [Co(C7H4ClO2)2(C6H6N2O)2(H2O)2], the CoII cation is located on an inversion center and is coordinated by two 2-chlorobenzoate anions, two nicotinamide (NA) ligands and two water molecules. The four O atoms in the equatorial plane around the CoII cation form a slightly distorted square-planar arrangement, while the slightly distorted octahedral coordination is completed by the two pyridine N atoms of the NA ligands in the axial positions. The dihedral angle between the carboxylate group and the adjacent benzene ring is 29.7 (4)°, while the pyridine and benzene rings are oriented at a dihedral angle of 83.17 (15)°. Intramolecular O-HO hydrogen bonding occurs between the carboxylate group and coordinating water molecule. In the crystal, intermolecular N-HO, O-HO and weak C-HO hydrogen bonds link the molecules into a three-dimensional network.
For background to niacin, see: Krishnamachari (1974). For information on the nicotinic acid derivative N,N-diethylnicotinamide, see: Bigoli et al. (1972). For related structures, see: Hökelek et al. (1996, 2009a,b); Hökelek & Necefoglu (1998, 2007); Necefoglu et al. (2011a,b). For bond-length data, see: Allen et al. (1987).
Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: XU5678 ).
The authors are indebted to Anadolu University and the Medicinal Plants and Medicine Research Centre of Anadolu University, Eskisehir, Turkey, for the use of X-ray diffractometer. This work was supported financially by Kafkas University Research Fund (grant No. 2009-FEF-03).
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