catena-Poly[[[tetra­aqua­zinc(II)]-μ-4,4′-bipyridine-κ(2) N:N′] benzene-1,4-di­carboxyl­ate]

In the title compound, {[Zn(C(10)H(8)N(2))(H(2)O)(4)](C(8)H(4)O(4))}(n), the Zn(II) atoms, lying on a twofold rotation axis, are bridged by 4,4′-bipyridine ligands, resulting in a linear chain along the b axis. In the chain, the Zn(II) atom adopts a slightly distorted octa­hedral coordination geometry involving four water mol­ecules at the equatorial positions. The noncoordinated benzene-1,4-dicarboxyl­ate anion, which is also located on a twofold rotation axis, bridges adjacent chains through O—H⋯O hydrogen bonds, forming a three-dimensional supra­molecular network.