Acta Cryst. (2006). E62, o2751-o2752  [ doi:10.1107/S1600536806020356 ]

The inner salt 4-carboxy-2-(pyridinium-4-yl)-1H-imidazole-5-carboxylate monohydrate

T. Sun, J.-P. Ma, R.-Q. Huang and Y.-B. Dong

Abstract: In the title compound, C₁₀H₇N₃O₄·H₂O, one carboxyl group is deprotonated and the pyridyl group is protonated. The inner salt molecule has a planar structure, apart from the carboxylic acid group, which is tilted from the imidazole plane by a small dihedral angle of 7.3 (3)°.

Online 14 June 2006

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