1H-Benzotriazole–4-hy­droxy­benzoic acid (1/1)

The asymmetric unit of the title compound, C₆H₅N₃·C₇H₆O₃, comprises independent benzotriazole and 4-hydroxybenzoic acid molecules. The dihedral angle between the benzene ring and the benzotriazole ring system is 15.18 (7)°. The mean plane of the carb­oxyl group is twisted at an angle of 18.55 (1)° with respect to the benzene ring. The crystal structure is stabilized by weak inter­molecular N—H...N, O—H...N, O—H...O and C—H...O inter­actions, forming a three-dimensional network.

Uronium 3-carb­oxy-4-hy­droxy­benzene­sulfonate

In the title compound, CH₅N₂O⁺·C₇H₅O₆S⁻, the dihedral angle between the benzene ring and the mean plane of the uronium cation is 76.02 (8)°. The carboxyl group in the anion is twisted by 1.47 (9)° from the benzene ring. In the crystal, the cation is linked to the anion by weak O—H...O and N—H...O hydrogen bonds and π–π inter­actions [centroid–centroid distance = 3.8859 (8) Å], forming a three-dimensional network.