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In the cation of the title molecular salt, C7H7N2+·C4H6NO4− (systematic name: 1H-benzo[d]imidazol-3-ium 2-azaniumylsuccinate), the benzimidazole ring system is almost planar (r.m.s. deviation = 0.012 Å). The cation is protonated at the N atom and the l-aspartate zwitterion is deprotonated at both carboxyl groups. In the anion, an N—H...O hydrogen bond and an N—H...O short contact generate S(6) graph-set motifs. In the crystal, the anions are linked via three N—H...O hydrogen bonds involving the NH3+ group, forming layers parallel to the ab plane. The benzimidazolium cations are linked to these layers by N—H...O hydrogen bonds. The layers are linked via C—H...O hydrogen bonds involving the benzimidazolium cation, forming a three-dimensional structure. There are also C—H...π interactions present involving inversion-related benzimidazolium cations

BenzimidazoliumL-aspartate