1-(4-Chlorophenyl)-1H-1,2,4-triazol-5(4H)-one

Abstract

In the title compound, C8H6ClN3O, the dihedral angle between the 1,2,4-triazole and benzene rings is 4.60 (9)° and an intramolecular C—H...O interaction closes an S(6) ring. In the crystal, inversion dimers linked by pairs of N—H...O hydrogen bonds generate R22(8) loops and C—H...O interactions link the dimers into [100] chains. Weak π–π stacking interactions [centroid–centroid distance = 3.644 (1) Å] are also observed.