Acta Cryst. (2010). E66, o2950-o2951 [ doi:10.1107/S1600536810042571 ]
Abstract: In the title molecular salt, C8H13N2O+·C7H3N2O7-·H2O, the pyrimidinium cation is essentially planar, with a maximum deviation of 0.009 (1) Å. The cation undergoes an enol-keto tautomerism during the crystallization. In the crystal, the ion pairs and water molecules are connected via O-HO, N-HO and C-HO hydrogen bonds, forming two-dimensional networks parallel to the bc plane. There is an intramolecular O-HO hydrogen bond in the 3,5-dinitrosalicylate anion, which generates an S(6) ring motif.
Online 30 October 2010
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