catena-Poly[[[tetra­aqua­cobalt(II)]-μ-4,4′-bipyridine-κ(2) N:N′] pyridine-3,5-dicarboxyl­ate trihydrate]

The crystal structure of the title compound, {[Co(C(10)H(8)N(2))(H(2)O)(4)](C(7)H(3)NO(4))·3H(2)O}(n), consists of Co(II) polymeric complex cations, uncoordinated pyridine-3,5-dicarboxyl­ate anions and lattice water mol­ecules. The Co(II) cation is coordinated by two N atoms from two 4,4′-bipyridine ligands and four water mol­ecules in a distorted octa­hedral geometry. The 4,4′-bipyridine ligands bridge Co cations, forming a polymeric chain running along the b axis. The two pyridine rings of the 4,4′-biyridine are twisted to each other by a dihedral angle of 8.95 (9)°. Extensive O—H⋯O hydrogen bonding network is present in the crystal structure.