Research Article: catena-Poly[[aqua­(2-iodo­benzoato-κO)cobalt(II)]-μ-aqua-μ-2-iodo­benzoato-κ2O:O′]

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.

Partial Text

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 ▶).