B. C. Manjunath

3-Methyl-1,5-diphenyl-4,5-dihydro-1H-pyrazole

In the title compound, C16H16N2, the dihydropyrazole ring adopts a shallow envelope conformation, with the C atom bearing the phenyl group displaced by 0.298 (2) Å from the other atoms (r.m.s. deviation = 0.015 Å). The dihedral angles between the four near coplanar atoms of the central ring and the N- and C-bonded phenyl groups are 13.49 (13) and 82.22 (16)°, respectively.

4-(Thio-phen-2-yl)-2-[4-(tri-fluoro-meth-yl)phen-yl]-2,3-di-hydro-1,5-benzo-thia-zepine.

In the title compound, C20H14F3NS2, the seven-membered thiazepine ring adopts a slightly distorted twist–boat conformation. The mean plane of the five-membered thiophene ring fused to the thiazepine ring is twisted by 32.3 (3) and 55.6 (4)° from the benzene and phenyl rings, respectively. In the crystal, inversion dimers linked by pairs of weak C—H⋯N interactions are observed.

5-(Prop-2-yn-1-yl)-5H-dibenzo[b,f]azepine: ortho-rhom-bic polymorph.

In the title orthorhombic polymorph (space group Iba2), C17H13N, the dihedral angle between the benzene rings is 55.99 (10)° and the azepine ring adopts a boat conformation. In the crystal, molecules are linked by C—H⋯π contacts. The previously-reported polymorph [Yousuf et al. (2012 ▶). Acta Cryst. E68, o1101] crystallizes in the monoclinic system (space group P21/c) with two molecules in the asymmetric unit.

2-(4-Fluoro­phen­yl)-4-(thio­phen-2-yl)-2,3-di­hydro-1,5-benzothia­zepine

In the title compound, C19H14FNS2, the seven-membered thiazepine ring adopts a slightly distorted twist boat conformation. The dihedral angle between the benzene rings is 53.6 (1)°. The mean plane of the thiazepine ring is twisted by 34.3 (7)° and 36.6 (7)° from the benezene rings. A C—H⋯F interaction generates stacking of molecules along the ab plane.

5-[(4-Benzyl-1H-1,2,3-triazol-1-yl)meth­yl]-5H-dibenzo[b,f]azepine

In the title compound, C24H20N4, the azepine ring adopts a boat conformation and the dihedral angle between the benzene rings fused to it is 57.95 (8)°. The bond-angle sum at the azepine N atom is 346.6°, indicating a significant deviation from planarity. The triazole ring subtends a dihedral angle of 71.45 (10)° with the terminal phenyl group. A weak intramolecular C—H⋯Na (a = azepine) interaction occurs, which closes an S(6) ring.

5-[(1-Benzyl-1H-1,2,3-triazol-4-yl)meth­yl]-5H-dibenzo[b,f]azepine

In the title compound, C24H20N4, the azepine ring adopts a boat conformation. The dihedral angle between the benzene rings fused to the azepine ring is 49.40 (9)°. The triazole ring makes a dihedral angle of 77.88 (9)° with the terminal phenyl ring. In the crystal, molecules are linked via C—H⋯π interactions and a parallel slipped π–π interaction [centroid–centroid distance = 3.7324 (9), normal distance = 3.4060 (6) and slippage = 1.526 Å], forming a three-dimensional network.

2-(3,4-Di-meth-oxy-phen-yl)-4-(thio-phen-2-yl)-2,3-di-hydro-1,5-benzo-thia-zepine.

In the title compound, C21H19NO2S2, the seven-membered thiazepine ring adopts a slightly distorted twist boat conformation. The dihedral angle between the benzene rings is 67.4 (2)°. The mean plane of the thiophene ring is twisted by 59.3 (2) and 87.7 (2)° from the mean planes of the benezene rings. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R 2 2(20) loops.

2,6-Dichloro-phen-yl 4-chloro-benzoate.

In the title compound, C13H7Cl3O2, the dihedral angle between the benzene rings is 82.1 (2)°. The dihedral angle between the CO2 group and its carbon-bonded ring is 14.50 (19)° In the crystal, aromatic π–π stacking interactions [minimum ring centroid separation = 3.604 (2) Å] occur.

A triclinic polymorph of (E)-2-(4-iso­butyl­phen­yl)-N′-[1-(4-nitro­phen­yl)ethyl­idene]propano­hydrazide

The asymmetric unit of the triclinic polymorph of the title compound, C21H25N3O3, consists of two molecules, whereas for the monoclinic polymorph Z′ = 1 [Fun et al. (2009 ▶). Acta Cryst. E65, o445]. The two molecules exhibit an E configuration with respect to the C=N bond. The molecules are linked into dimers by N—H⋯O and C—H⋯O hydrogen bonds forming R 2 2(8) ring motifs. In addition, π–π interactions occur between nitrophenyl groups [minimum centroid–centroid distance 3.940 (2) Å], stacking the molecules along the ac plane.

4-Chloro-2-(2-chloro­benzoyl)phenol

In the title molecule, C13H8Cl2O2, the dihedral angle between the benzene rings is 74.53 (9)°. An intramolecular O—H⋯O hydrogen bond leading to a S(6) ring is observed. In the crystal, the molecules are connected into a three-dimensional network by C—H⋯O and π–π [inter-centroid distance = 3.6254 (10) Å] interactions.