catena-Poly[[[bis(μ-4-cyanobenzoato-κ2O:O)-bis[(4-cyanobenzoato-κ2O,O′)cobalt(II)]]-di-μ-4,4′-bipyridine-κ4N:N′] dihydrate dimethylformamide tetrasolvate]

The crystal structure of the title compound, {[Co-2(C8H4NO2) (4)(C10H8N2)(2)] . 2H(2)O . 4C(3)H(7)NO}(n), features a centrosymmetric eight-membered - Co - O - C - O - Co - O - C - O-ring that arises from the bridging of two Co atoms by two cyanobenzoate units across a center of symmetry. Each Co atom is also chelated by a cyanobenzoate unit and the two remaining coordination sites, trans to each other in the distorted octahedron, are occupied by the N atoms of the heterocycle, resulting in a polymeric ribbon structure. The water and dimethylformamide molecules occupy the space between the chains.