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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.

acta crystallographica. section e

catena-Poly[[diaquazinc(II)]-μ-piperazine-1,4-diacetato-κ4N1,O1:N4,O4]