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Acta Cryst. (2012). E68, o134-o135  [ doi:10.1107/S1600536811052998 ]


Q. Cao, B.-R. Duan, B. Zhu and Z. Cao

Abstract: In the title compound, C4H4N2O2, both imidazole N atoms are protonated and carboxylate group is deprotonated, resulting in a zwitterion. The molecule is essentially planar, with an r.m.s. deviation of 0.012 (1) Å. In the crystal, N-H...O hydrogen bonds and [pi]-[pi] stacking interactions [centroid-centroid distance = 3.674 (2) Å] between the imidazole rings link the molecules into a three-dimensional supramolecular network.

Online 17 December 2011

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