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The title compound, C20H10F12N4O4S2, is an organic diaryl disulfide compound with trifluoroacetamide substituents at the ortho-positions of each benzene ring. There are two molecules (labeled A and B) in the asymmetric unit. The F atoms of three of the –CF3 groups exhibit rotational disorder over two positions each. The S—S bond distances are 2.0914 (7) and 2.0827 (6) Å for molecules A and B, respectively. The dihedral angle between the S—S—C and S—C—C planes is 103.05 (15)° for molecule A and 104.09 (15)° for molecule B. The three-dimensional supramolecular architecture of the crystal is sustained by numerous N—H...O, N—H...S and C—H...O interactions.

In the title compound, C15H18N2O3S, the hydropyrimidine ring adopts a sofa conformation with the methine C atom as the flap. The benzene ring is almost perpendicular to the mean plane of the hydropyrimidine ring, making a dihedral angle of 85.51 (8)°, and the methoxy O atom lies over the centre of the pyrimidine ring. In the crystal, weak N—H...S interactions form a zigzag chain running along the b-axis direction.

In the title compound, C10H10N2S, all non-H atoms are almost coplanar [maximum deviation = 0.103 (1) Å]. In the crystal, N—H...S interactions form R22(8) rings linking pairs of molecules related by inversion. The molecular pairs are stacked along [100]. A herringbone arrangement of pairs in the [010] direction forms layers parallel to (010).

Two new molecular structures, namely 1,3-bis(trimethylsilyl)-1 H-benzimidazole-2(3 H)-thione, C13H22N2SSi2, (2), and 1-trimethylsilyl-1 H-benzimidazole-2(3 H)-thione, C10H14N2SSi, (3), are reported. Both systems were derived from 1 H-benzimidazole-2(3 H)-thione. Noncovalent C-H...π interactions between the centroid of the benzmidazole system and the SiMe3 groups form helicoidal arrangements in (2). Dimerization of (3) results in the formation of R22(8) rings via N-H...S interactions, along with parallel π-π interactions between imidazole and benzene rings. [ABSTRACT FROM AUTHOR]