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In the title compound, C9H10N4OS, the dihedral angle between the benzene and 1H-1,2,4-triazole-5(4H)-thione rings is 67.51 (16)°. In the crystal, mol­ecules are liked via N—H...O hydrogen bonds, forming chains along the c-axis direction. The chains are linked via O—H...S hydrogen bonds, forming corrugated layers lying parallel to the bc plane. The layers are linked via N—H...N and N—H...S hydrogen bonds, forming a three-dimensional network.

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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 intra­molecular C—H...S contact occurs. In the crystal, pairs of weak N—H...S inter­actions link the mol­ecules into inversion dimers in the ac plane, forming R22(8) graph-set motifs. In addition, weak π–π inter­actions [centroid–centroid distances = 3.3463 (14) and 3.6127 (13)Å] are observed.
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