Crystal structure of catena-poly[[di­aqua­cobalt(II)]-bis­[μ-5-(4-carb­oxy­ylato­phenyl)picolinato]-κ(3) N,O (2):O (5);κ(3) O (5):N,O (2)-[di­aqua­cobalt(II)]-μ-1-[4-(1H-imidazol-1-yl)phen­yl]-1H-imidazole-κ(2) N (3):N (3′)]

The asymmetric unit of the title polymeric Co(II) complex, [Co(2)(C(13)H(7)NO(4))(2)(C(12)H(10)N(4))(H(2)O)(4)](n), contains a Co(II) cation, a 5-(4-carboxyl­atophen­yl)picolinate dianion, two coordination water mol­ecules and half of 1-[4-(1H-imidazol-1-yl)phen­yl]-1H-imidazole ligand. The Co(II) cation is coordinated by two picolinate dianions, two water mol­ecules and one 1-[4-(1H-imidazol-1-yl)phen­yl]-1H-imidazole mol­ecule in a distorted N(2)O(4) octa­hedral coordination geometry. The two picolinate dianions are related by an inversion centre and link two Co(II) cations, forming a binuclear unit, which is further bridged by the imidazole mol­ecules, located about an inversion centre, into the polymeric chain propagating along the [-1-11] direction. In the crystal, the three-dimensional supra­molecular architecture is constructed by O—H⋯O hydrogen bonds between the coordinating water mol­ecules and the non-coordinating carboxyl­ate O atoms of adjacent polymeric chains.