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In the title compound, C10H9N3O3, there is a small twist between the benzene and triazole rings [dihedral angle = 6.32 (7)°]; the carboxylic acid residue is almost coplanar with the benzene ring to which it is attached [O—C—C—C torsion angle = 1.49 (19)°]. The main deviation from coplanarity of the non-H atoms is found for the hydroxy group which is almost perpendicular to the remaining atoms [N—C—C—O torsion angle = −75.46 (16)°]. In the crystal, the presence of O—H...O (between carboxyl groups) and O—H...N (between the hydroxy group and the triazole ring) hydrogen bonds leads to supramolecular chains along [03overline{1}]. The chains are connected into sheets via C—H...O(hydroxy) interactions.