catena-Poly[[diaqua­zinc(II)]-μ-piper­azine-1,4-diacetato-κ(4) N (1),O (1):N (4),O (4)]

The asymmetric unit of the title compound, [Zn(C(8)H(12)N(2)O(4))(H(2)O)(2)](n), contains a Zn(II) ion residing on an inversion center, half of a centrosymmetric piperazine-1,4-diacetate ligand (L) and a water mol­ecule. The Zn(II) ion is trans-coordinated by two N,O-bidentate L ligands and by two water mol­ecules in a distorted octa­hedral geometry. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds link polymeric chains into a three-dimensional supra­molecular structure.