Acta Cryst. (2009). E65, o22  [ doi:10.1107/S1600536808040221 ]

4-Carboxy-2-methyl-1H-imidazol-3-ium-5-carboxylate monohydrate

Y.-P. Guo

Abstract: In the title compound, C₆H₆N₂O₄·H₂O, one carboxyl group is deprotonated and one imidazole N atom is protonated. The organic molecule, excluding methyl H atoms, is essentially planar, with an r.m.s. deviation of 0.0156 (1) Å. In the crystal structure, intermolecular N-HO hydrogen bonds link molecules into chains along the b axis; these chains are further linked via O-HO hydrogen bonds involving the water O atoms and carboxyl O atoms, generating a two-dimensional supramolecular framework.

Online 6 December 2008

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