catena-Poly[[bis­(3,5-dicarboxy­benzo­ato)cobalt(II)]-μ-4,4′-bipyridine]

In the title compound, [Co(C(9)H(5)O(6))(2)(C(10)H(8)N(2))](n), the asymmetric unit consists of one Co(2+) ion with site symmetry 2, one mono-deprotonated 1,3,5-benzene­tricarboxylic acid anion and one-half of a 4,4′-bipyridine (4,4′-bipy) mol­ecule, in which two N and two C atoms have site symmetry 2. In the crystal structure, the Co(2+) centre is coordinated by four O atoms from two bidentate carboxyl­ate groups of two anions and two N atoms of two 4,4′-bipy mol­ecules, resulting in infinite chains propagating in [010]. The cobalt coordination is distorted trans-CoO(4)N(2) octa­hedral and inter­chain O—H⋯O hydrogen bonds complete the structure.