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In the title compound, C8H7ClN4S, the benzene ring is statistically disordered over two conformations rotated about the Cl—C...C—C axis, which subtend dihedral angles of 24.7 (3) and 9.9 (2) ° with respect to the triazole ring. An intramolecular C—H...N close contact occurs. In the crystal, N—H...N and N—H...S hydrogen bonds link the molecules into (001) sheets: R22(8) and R22(10) graph-set motifs result. Weak C—H...N hydrogen bonds and aromatic π–π stacking interactions [shortest centroid–centroid separation = 3.681 (7) Å] complete the structure.