catena-Poly[[[tetraaquazinc(II)]-μ-4,4′-bipyridine-κ2 N:N′] benzene-1,4-dicarboxylate]

In the title compound, {[Zn(C10H8N2)(H2O)4](C8H4O4)}n, the ZnII 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 ZnII 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.