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In the title compound, C30H24N4O2S, the four phenyl rings of the substituent groups make dihedral angles of 88.1 (2), 81.0 (2), 21.4 (2) and 44.6 (2)° with the triazole group. An intramolecular hydroxy–imino O—H...N hydrogen bond results in the formation of an approximately planar (r.m.s deviation = 0.0230 Å) six-membered ring.

In the title molecule, C31H26N4O2S, the phenyl ring attached to the 1,2,4-triazole ring forms dihedral angles of 65.4 (2), 63.4 (2) and 62.2 (2)° with the other three rings. The 1,2,4-triazole ring makes dihedral angles of 78.0 (2), 87.9 (2), 24.9 (2) and 62.8 (2)° with three phenyl rings and the methoxyphenyl ring.

There are two crystallographically independent molecules (A and B) in the asymmetric unit of the title compound, C25H22N4O2S, with almost identical molecular conformations. The hydroxyphenyl ring plane and the 1,2,4-triazole ring form dihedral angles of 17.1 (2) and 7.4 (2)° in A and B, respectively. The dihedral angles between 1,2,4-triazole ring and the other two phenyl rings are 89.6 (3) and 83.3 (2)° in molecule A, and 89.2 (3) and 82.2 (2)° in molecule B. One intramolecular O—H...N hydrogen bond is present in each molecule. Weak intermolecular C—H...O hydrogen bonds consolidate the crystal packing.

In the title molecule, C24H21ClN4OS, the 1,2,4-triazole ring forms dihedral angles of 37.2 (2), 71.9 (2) and 84.9 (2) ° with the three benzene rings. In the crystal, weak intermolecular N—H...S hydrogen bonds link the molecules into centrosymmetric dimers.

In the crystal structure of the title compound, C5H3Cl3N4S, two molecules related by a centre of symmetry demonstrate extremely short intermolecular S...N contacts of 2.783 (2) Å. The crystal packing also exhibits π–π interactions indicated by a short distance of 3.340 (1) Å between the centroids of the triazole rings of neighbouring molecules.