R. Archana

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.

1-(1-Hy­droxy-8-methyl-9H-carbazol-2-yl)ethanone

The title compound, C15H13NO2, crystallizes with four independent molecules (A, B, C and D) in the asymmetric unit. The carbazole units are almost planar [maximum deviations = 0.015 (3) for A, 0.024 (3) for B, 0.026 (3) for C and 0.046 (3) Å for D]. In all four molecules, there is an O—H⋯O hydrogen bond involving the hydroxy substituent and the carbonyl O atom of the adjacent acetyl group, which forms a six-membered ring. In the crystal, the four independent molecules are linked via N—H⋯O and C—H⋯O interactions.

2-(2,3,4,9-Tetra­hydro-1H-carbazol-1-ylidene)propane­dinitrile

In the title molecule, C15H11N3, the dihedral angle between the benzene ring and the fused pyrrole ring is 1.07 (5)°. The cyclohexene ring adopts an envelope conformation: the dicyanomethylene group at position 1 has a coplanar orientation. An intramolecular N—H⋯N hydrogen bond generates an S(7) ring motif. Intermolecular N—H⋯N hydrogen bonds form an R 2 2(14) ring in the crystal. A C—H⋯π interaction involving the benzene ring is also found in the structure.

8-Methyl-2,3,4,9-tetra­hydro-1H-carbazol-1-one

In the title compound, C13H13NO, the dihedral angle between the benzene ring and the fused pyrrole ring is 0.96 (7)°. The cyclohexenone ring adopts an envelope conformation. Intermolecular N—H⋯O hydrogen bonds form R 2 2(10) ring motifs in the crystal structure. Weak C—H⋯π interactions involving the benzene ring also occur.

2-Chloro-7,8,9,10-tetra-hydro-cyclo-hepta-[b]indol-6(5H)-one.

In the title molecule, C13H12ClNO, the dihedral angle between the benzene and pyrrole rings is 1.38 (9)°. The cycloheptene ring adopts a distorted twist chair and sofa conformation. Intermolecular N—H⋯O hydrogen bonds form an R 2 2(10) loop in the crystal packing. Further, weak C—H⋯O and C—H⋯π (involving the benzene ring) interactions are found in the crystal structure.

(E)-1-Diphenyl­methyl­idene-2-[(1H-indol-3-yl)methyl­idene]hydrazine

In the title compound, C22H17N3, the 1H-indole unit is essentially planar, with a dihedral angle of 0.95 (10)° between the pyrrole ring and the fused benzene ring. The dihedral angle between the two phenyl rings is 65.09 (10)°. In the crystal, an intermolecular N—H⋯N hydrogen bond forms an infinite chain in the b-axis direction.

N′-(2-Methyl-3-phenyl­allyl­idene)nicotinohydrazide monohydrate

The asymmetric unit of the title compound, C16H15N3O·H2O, contains an N′-(2-methyl-3-phenylallylidene)nicotinohydrazide molecule and a water solvent molecule. The dihedral angle between the pyridine ring and the phenyl ring is 47.26 (5)°. Intermolecular O—H⋯N, O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds are found in the crystal structure. Furthermore, C—H⋯π interactions involving the pyridine and phenyl rings are also found.

2,5-Diphenyl-penta-2,4-dienenitrile.

In the title compound, C17H13N, the dihedral angle between the two phenyl rings is 17.6 (1)°. An intermolecular C—H⋯N hydrogen bond is found in the crystal structure, also a C—H⋯π interaction involving the phenyl ring at position 5.

10-Methyl-2-oxo-4-phenyl-2,11-di­hydro­pyrano[2,3-a]carbazole-3-carbo­nitrile

In the title molecule, C23H14N2O2, the atoms in the carbazole unit deviate from planarity [maximum deviation from mean plane = 0.1018 (8) Å]. The pyrrole ring makes dihedral angles of 4.44 (5), 3.84 (5), 2.18 (5) and 56.44 (5)° with the pyran, fused benzene rings and phenyl ring, respectively. In the crystal, pairs of N—H⋯O hydrogen bonds generate R 2 2(14) loops and a C—H⋯N interaction is also found. Molecules are further linked by a number of π–π interactions [centroid–centroid distances vary from 3.5702 (5) to 3.7068 (6) Å], forming a three-dimensional network.

7-Methyl-1-phenyl-1,10-di-hydro-pyrazolo-[3,4-a]carbazole.

In the title molecule, C20H15N3, the atoms in the carbazole unit deviate from planarity [maximum deviation from mean plane = 0.1082 (15) Å]. The pyrrole ring makes dihedral angles of 3.17 (8)/4.10 (9), 7.20 (9) and 44.62 (9)° with the fused benzene, pyrazole and phenyl rings, respectively. In the crystal, molecules are linked via N—H⋯N hydrogen bonds, forming an infinite chain along [010]. Molecules are further linked by nine π–π [centroid–centroid distances vary from 3.6864 (11) to 3.9802 (11) Å] and one C—H⋯π interaction, forming a three-dimensional network.