4-[(E)-(4-Chloro-benzyl-idene)amino]-3-methyl-1H-1,2,4-triazole-5(4H)-thione

In the title compound, C10H9ClN4S, the dihedral angle between the mean planes of the phenyl and 1H-1,2,4-triazole-5(4H)-thione rings is 25.3 (9)°. The latter ring is essentially planar, with maximum deviations of 0.010 and -0.010 Å for the ring N atom in the 4-position and ring C atom bearing the methyl group, respectively. An intra-molecular C-H⋯S contact occurs. In the crystal, pairs of weak N-H⋯S inter-actions link the mol-ecules into inversion dimers in the ac plane, forming R 2 (2)(8) graph-set motifs. In addition, weak π-π inter-actions [centroid-centroid distances = 3.3463 (14) and 3.6127 (13)Å] are observed.