Benzimidazolium 3,5-dicarboxybenzoate trihydrate

Abstract

Cocrystallization of benzimidazole with benzene 1,3,5-tricarboxylic acid in slightly basic medium afforded the title compound, C7H7N2+·C9H5O6−·3H2O, in which one of the imidazole N atom is protonated and one carboxylic group of aromatic acid is deprotonated. In the crystal structure, intermolecular N—H...O hydrogen-bonding connects the two organic components into dimers, which are further linked into a three-dimensional network by O—H...O and N—H...O interactions between the water molecules and the dimers.