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In the title compound, C13H19N3S, the methyl­amine substituent is coplanar with the thia­diazole ring to which it is attached [C—N—C—S torsion angle = 175.9 (2)°] and the amine H atom is syn to the thia­diazole S atom. Supra­molecular chains along [101], sustained by N—H...N hydrogen bonding, feature in the crystal packing.

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In the title compound, C26H34F2N6S, the triazole ring is linked to a benzene ring via an imine bond [N=C = 1.255 (2) Å; conformation: E], with a dihedral angle of 25.21 (11)° between the rings. The 4-ethyl­piperazinyl residue is folded away from the thione-S atom. In the crystal, helical supra­molecular chains propagating along [010] and sustained by weak C—S...π(triazole) inter­actions occur [S...centroid distance = 3.2872 (10) Å]. Links between these chains are of the type benzene-C—H...N(imine) and π–π [between centrosymmetrically related benzene rings with an inter-centroid distance of 3.9241 (15) Å] and result in a three-dimensional architecture.

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In the title compound, C25H32F3N5S, two independent mol­ecules comprise the asymmetric unit and are related across a pseudo-centre of inversion. The piperazine rings have chair conformations with each N-bound substituent occupying an equatorial position so that the dihedral angles between the planes of the triazole and benzene ring are 78.20 (19) and 79.10 (19)° for the two independent mol­ecules, indicating that the mol­ecules have an L-shape. In the crystal, a three-dimensional architecture is stabilized by C—H...π inter­actions. The crystal studied was an inversion twin with the fractional contribution of the minor component being 0.27 (9).

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In the title compound, C19H23N3OS, the oxa­diazole and benzene rings are inclined at a dihedral angle of 50.30 (11)°, with the major twist between them occurring at the ring–methyl­ene N—C bond [N—N—C—N torsion angle = −101.2 (2)°]. In the crystal, helical supra­molecular chains along [010] are sustained by N—H...S hydrogen bonds. These are linked into layers lying parallel to (-101) by methyl­ene–phenyl C—H...π inter­actions.

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In the title compound, C19H22FN3OS, the dihedral angle between the inclined oxa­diazole and benzene rings is 52.7 (3)°. In the crystal, helical supra­molecular chains along [100] are sustained by N—H...S hydrogen bonds supported by methyl­ene–benzene C—H...π inter­actions. The crystal studied was an inversion twin with the fractional contribution of the minor component being 0.33 (14).
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