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The crystal structure of the title compound, {[Zn(C 6 H 3 N 2 O 4 )(H 2 O) 2 ]NO 3 }  n  , is built of zigzag cationic chains propagating in [010] with nitrate anions located in the space between the chains. The Zn II  ion is coordinated by N and O atoms of two symmetry-related ligands in equatorial sites, and by two water O atoms at the axial sites of a distorted octa­hedron. One carboxyl­ate group of the ligand remains protonated, serving as a donor in a short intra­molecular O—H⋯O hydrogen bond. The coordinated water mol­ecules are donors and the nitrate O atoms act as acceptors in a network of O—H⋯O hydrogen bonds.

acta crystallographica. section e

catena-Poly[[(diaquazinc)-μ-3-carboxypyrazine-2-carboxylato-κ4N1,O2;N4,O3] nitrate]