ABSTRACT
In the title compound, [Co(C(6)H(6)N(4))(2)(H(2)O)(2)](C(16)H(8)O(8)), the Co(II) cation and the organic anion occupy different crystallographic inversion centres and, as a consequence, the asymmetric unit comprises two half-mol-ecules. The benzene groups are coplanar. The four coordinating N atoms of the two bidentate biimidazole ligands define the equatorial plane of a slightly distorted octa-hedral CoO(2)N(4) geometry, and the water O atoms lie in the axial coordination sites. Translational (a,) and inversion-related symmetry operations link the Co complex mol-ecules and the negatively charged carboxyl-ate anions via inter-molecular N-Hâ¯O and O-Hâ¯O hydrogen bonds into sheets parallel to (01). The coordinated water mol-ecules connect the sheets through O-Hâ¯O hydrogen bonds, forming a three-dimensional framework. In addition, two intra-molecular O-Hâ¯O hydrogen bonds are observed between the carboxyl and carboxyl-ate groups.
