2-(2-Hydroxy-3-methoxyphenyl)-1H-benzimidazol-3-ium perchlorate

In the title molecular salt, C14H13N2O2+·ClO4 , the ring systems in the cation are almost coplanar [dihedral angle = 5.53 (13)°]. Intramolecular N—H...O and O—H...O hydrogen bonds generate S(6) and S(5) rings, respectively. In the crystal, the two H atoms involved in the intramolecular hydrogen bonds also participate in intermolecular links to acceptor O atoms of the perchlorate anions. A simple intermolecular N—H...O bond also occurs. Together, these form a double-chain structure along [101].