Date Published: May 01, 2012
Publisher: International Union of Crystallography
Author(s): Ömür Aydın, Nagihan Çaylak Delibaş, Hacali Necefoğlu, Tuncer Hökelek.
The asymmetric unit of the polymeric title compound, [Co(C7H4IO2)2(H2O)2]n, contains one CoII cation, two iodobenzoate anions and two water molecules. One iodobenzoate anion and one water molecule bridge adjacent Co cations, forming a polymeric chain running along the a axis, while the other iodobenzoate anion and water molecule coordinate in a monodentate manner to the CoII cation, completing the slightly distorted octahedral geometry. In the two independent anionic ligands, the carboxylate groups are twisted away from the attached benzene rings by 51.38 (18) and 39.89 (11)°, and the two benzene rings are nearly perpendicular to each other with a dihedral angle of 86.09 (10)°. Intramolecular O—H⋯O hydrogen bonds between coordinating water molecules and adjacent carboxylate O atoms help to stabilize the molecular structure. In the crystal, weak C—H⋯O hydrogen bonds link the polymeric chains into a three-dimentional supramolecular network.
For niacin, see: Krishnamachari (1974 ▶) and for information on the nicotinic acid derivative N,N-diethylnicotinamide, see: Bigoli et al. (1972 ▶). For related structures, see: Hökelek et al. (2009 ▶, 2010a ▶,b ▶, 2011 ▶); Necefoğlu et al. (2011 ▶); Zaman et al. (2012 ▶). For bond-length data, see: Allen et al. (1987 ▶).