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The polymeric title compound, {(C4H12N2)[Zn(C7H3NO4)2(H2O)]&#183;2H2O}n, was obtained by the reaction of zinc(II) nitrate hexahydrate with the proton-transfer compound (pipzH2)(py-2,5-dc) (where pipz is piperazine and py-2,5-dcH2 is pyridine-2,5-dicarboxylic acid) in aqueous solution. Each ZnII atom is coordinated in a distorted octahedral geometry by four O atoms and two N atoms from one water molecule and two (py-2,5-dc)2&#8211; ligands, which also act as bridging ligands between ZnII atoms. &#960;&#8211;&#960; Stacking interactions between two aromatic rings of (py-2,5-dc)2&#8211; fragments, with centroid&#8211;centroid distances of 3.4747&#8197;(7) and 3.7081&#8197;(7)&#8197;&#197; are observed. The crystal structure is stabilized by O&#8212;H...O and N&#8212;H...O hydrogen bonds

Poly[piperazinediium [aquabis(μ-pyridine-2,5-dicarboxylato)zincate] dihydrate]