Acta Cryst. (2004). E60, o1914-o1916  [ doi:10.1107/S1600536804024158 ]

A second monoclinic modification of benzimidazolium 3-carboxyphenoxyacetate 3-carboxyphenoxyacetic acid

S. Gao, L.-H. Huo, C.-S. Gu, H. Zhao and S. W. Ng

Abstract: In the primitive monoclinic modification of the title compound, C₇H₇N₂⁺·C₉H₇O₅^-·C₉H₈O₅, the two monoanions are connected by an `acid' O-HO hydrogen bond whose H atom does not lie on a special position. This acid hydrogen atom and the two monoanions comprise a carboxylate monoanion/neutral molecule in which the acid H atom is disordered between the two monoanionic units. The chains are connected into a layer structure through the C₇H₇N₂⁺ cations via N-HO hydrogen bonds.

Online 9 October 2004

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