A. Thiruvalluvar

2-(4-Fluoro-phen-yl)-4,5-dimethyl-1-(4-methyl-phen-yl)-1H-imidazole.

In the title molecule, C18H17FN2, the imidazole ring is essentially planar [maximum deviation of 0.005 (1) Å and makes dihedral angles of 72.33 (8) and 18.71 (8)° with the methylphenyl and fluorophenyl rings, respectively. The dihedral angle between the two benzene rings is 75.05 (7)°. The crystal packing is stabilized by intermolecular C—H⋯N hydrogen bonds.

4,5-Dimethyl-2-phenyl-1-(p-tol­yl)-1H-imidazole

In the title compound, C18H18N2, the imidazole ring is essentially planar [maximum deviation = 0.004 (1) Å] and makes dihedral angles of 68.91 (8) and 20.43 (9)° with the tolyl and phenyl rings, respectively. The dihedral angle between the latter rings is 73.62 (8)°. The crystal packing is stabilized by intermolecular C—H⋯N hydrogen bonds.

2-(4-Fluoro-phen-yl)-1,4,5-triphenyl-1H-imidazole.

In the title molecule, C27H19FN2, the imidazole ring is essentially planar [maximum deviation = 0.004 (1) Å] and makes dihedral angles of 62.80 (6), 36.98 (6), 33.16 (6) and 46.24 (6)°, respectively, with the substituent rings in the 1-, 2-, 4- and 5-positions. No classical hydrogen bonds are observed in the crystal structure.

4,5-Dimethyl-1,2-diphenyl-1H-imidazole monohydrate

In the title compound, C17H16N2·H2O, the imidazole ring is essentially planar [maximum deviation = 0.0037 (7) Å]. The imidazole ring makes dihedral angles of 80.74 (7) and 41.62 (7)° with the phenyl rings attached to the N and C atoms, respectively. The dihedral angle between the two phenyl rings is 75.83 (8)°. Intermolecular O—H⋯N and O—H⋯O hydrogen bonds are found in the crystal structure.

2-(4-Fluoro­phen­yl)-1-phenyl-1H-benzimidazole

In the title molecule, C19H13FN2, the benzimidazole unit is close to planar [maximum deviation = 0.0342 (9) Å] and forms dihedral angles of 58.94 (3) and 51.43 (3)° with the phenyl and fluorobenzene rings, respectively; the dihedral angle between the phenyl and fluorobenzene rings is 60.17 (6)°. In the crystal, three C—H⋯F hydrogen bonds and two weak C—H⋯π interactions involving the fused benzene ring lead to a three-dimensional architecture.

1,2-Diphenyl-1H-imidazo[4,5-f][1,10]phenanthroline.

In the title compound, C25H16N4, the fused ring system is essentially planar [maximum deviation = 0.1012 (15) Å]. The imidazole ring makes dihedral angles of 77.41 (8) and 56.26 (8)° with the phenyl rings attached to nitrogen and carbon, respectively. The dihedral angle between the two phenyl rings is 65.50 (8)°. Weak C—H⋯π interactions are found in the crystal structure.

r-2,c-6-Bis(4-chloro-phen-yl)-t-3-isopropyl-1-nitro-sopiperidin-4-one.

In the title molecule, C20H20Cl2N2O2, the piperidine ring adopts a chair conformation and the nitroso group at position 1 has a bisectional orientation. The two benzene rings and the isopropyl group attached to the piperidine ring in positions 2, 6 and 3, respectively, have axial orientations. The dihedral angle between the two benzene rings is 21.56 (13)°. One of the Cl atoms is disordered over two positions in a 0.281 (5):0.719 (5) ratio. In the crystal structure, molecules are linked by C—H⋯O hydrogen bonds and a short C—H⋯O contact occurs within the molecule.

(E)-1-[4-(Methyl­sulfan­yl)phen­yl]-3-phenyl­prop-2-en-1-one

In the title molecule, C16H14OS, the dihedral angle between the phenyl and benzene rings is 3.81 (15)°. The H atoms of the central enone group are trans. The propenone unit makes dihedral angles of 11.73 (18) and 11.62 (17)° with the benzene and phenyl rings, respectively. The crystal structure is stabilized by weak C—H⋯O and C—H⋯π interactions.

1-(4-Methyl-benz-yl)-2-(4-methyl-phen-yl)-1H-benzimidazole.

The title compound, C22H20N2, crystallizes with two independent molecules (A and B) in the asymmetric unit. The benzimidazole units are almost planar [maximum deviations = 0.0161 (8) Å for A and 0.0276 (8) Å for B]. The dihedral angles between the benzimidazole unit and the benzene rings of the 4-methylbenzyl and 4-methylphenyl groups are 76.64 (3) and 46.87 (4)°, respectively, in molecule A. The corresponding values in molecule B are 86.31 (2) and 39.14 (4)°. The dihedral angles between the planes of the two benzene rings are 73.73 (3) and 80.69 (4)° in molecules A and B, respectively. Pairs of weak intermolecular C—H⋯N hydrogen bonds link B molecules, forming centrosymmetric dimers with R 2 2(8) ring motifs. There are no significant corresponding interactions involving the A molecules.

9-Ethyl-N-(3-nitro­benzyl­idene)-9H-carbazol-3-amine

The title compound, C21H17N3O2, crystallizes with two molecules in the asymmetric unit. The carbazole groups show relatively small deviations from planarity [maximum displacements from the mean carbazole plane are 0.077 (7) and 0.101 (7) Å]. The dihedral angles between the 3-nitrobenzylideneamine and carbazole groups are 37.9 (1) and 37.0 (1)° in the two molecules.