catena-Poly[[aqua(2-iodobenzoato-kappa O)cobalt(II)]-mu-aqua-mu-2-iodobenzoato-kappa O-2:O ']

The asymmetric unit of the polymeric title compound, [Co(C7H4IO2)(2)(H2O)(2)](n), contains one Co-II 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 Co-II 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)degrees, and the two benzene rings are nearly perpendicular to each other with a dihedral angle of 86.09 (10)degrees. Intramolecular O-H center dot center dot center dot O hydrogen bonds between coordinating water molecules and adjacent carboxylate O atoms help to stabilize the molecular structure. In the crystal, weak C-H center dot center dot center dot O hydrogen bonds link the polymeric chains into a three-dimentional supramolecular network.