| Summary: | In the anion of the title molecular salt, C7H7N2+·C7H5O3− (systematic name: 1H-benzimidazol-3-ium 2-hydroxybenzoate), there is an intramolecular O—H...O hydrogen bond that generates an S(6) ring motif. The CO2 group makes a dihedral angle of 5.33 (15)° with its attached ring. In the crystal, the dihedral angle between the benzimidazolium ring and the anion benzene ring is 75.88 (5)°. Two cations bridge two anions via two pairs of N—H...O hydrogen bonds, enclosing an R44(16) ring motif, forming a four-membered centrosymmetric arrangement. These units are linked via C—H...O hydrogen bonds, forming chains propagating along the b-axis direction. The chains are linked by C—H...π and π–π interactions [inter-centroid distances = 3.4156 (7) and 3.8196 (8) Å], forming a three-dimensional structure.
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