Acta Cryst. (2011). E67, o488  [ doi:10.1107/S1600536811002248 ]

3-(4-Carboxy-5-carboxylato-1H-imidazol-2-yl)pyridin-1-ium monohydrate

G.-J. Liu, G.-W. Zhao, L. Li and H.-T. Gao

Abstract: In the zwitterionic molecule of the title compound, C₁₀H₇N₃O₄·H₂O, one carboxyl group is deprotonated and the pyridine N atom is protonated. The pyridinium and imidazole rings form a dihedral angle of 5.23 (1)°. An intramolecular O-HO hydrogen bond occurs. In the crystal, intermolecular N-HO, O-HN and O-HO hydrogen bonds link the zwitterions and water molecules into sheets parallel to (102).

Online 26 January 2011

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