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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.

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In the title compound, C28H18N2O5, the dihedral angle between the terminal benzoate rings is 20.67 (12)°. The central oxadiazole ring is almost coplanar with its two benzene ring substituents, making dihedral angles of 4.80 (16) and 5.82 (16)°. In the crystal, pairs of C—H...O hydrogen bonds form inversion dimers with R22(40) ring motifs. The structure also features C—H...O, C—H...π and π–π inter­actions [centroid–centroid separation = 3.695 (4) Å].

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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.

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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.

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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 R22(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.

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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.

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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.

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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.
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