title: catena-Poly[[(diaqua-zinc)-μ-3-carb-oxy-pyrazine-2-carboxyl-ato-κN,O;N,O] nitrate].
abstract: 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 octa-hedron. One carboxyl-ate group of the ligand remains protonated, serving as a donor in a short intra-molecular O-H⋯O hydrogen bond. The coordinated water mol-ecules are donors and the nitrate O atoms act as acceptors in a network of O-H⋯O hydrogen bonds.
authors.affiliation: Institute of Nuclear Chemistry and Technology, ul. Dorodna 16, 03-195 Warszawa,  Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Starosta
authors.forename: Janusz
authors.initials: J
authors.lastname: Leciejewicz