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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, C18H17N3O·0.5C2H5OH, the dihedral angles between the central imidazole rings and the pendant benzene rings are 42.06 (15) and 2.01 (16)° in one asymmetric mol­ecule and 47.91 (15) and 7.31 (14)° in the other. An intra­molecular N—H...O hydrogen bond occurs in each imidazole mol­ecule. In the crystal, the components are connected by O—H...N, N—H...O, C—H...O and N—H...N hydrogen bonds. Weak aromatic π–π inter­actions also occur [shortest centroid–centroid distance = 3.684 (3) Å].

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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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The asymmetric unit of the title compound, C23H21N3, consists of two symmetry-independent and conformationally different mol­ecules [the comparable dihedral angles between the imidazole ring and the three benzene rings being 38.5 (2)/61.5 (3)/3.37 (17) and 45.8 (2)/36.01 (19)/46.94 (17)°]. In the crystal, inter­molecular imidazole N—H...N hydrogen-bonding inter­actions give a one-dimensional chain extending along [101].

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In the title compound C18H26BrNO2S, the thia­zepine ring adopts a boat conformation. The dihedral angle between the mean planes through the benzene ring and the four C atoms making up the basal plane of the boat is 35.8 (2)°. In the crystal, inversion dimers linked by pairs of N—H...O hydrogen bonds generate R22(8) loops.

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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 compound, C23H15F3N2O2S, the thia­zole ring makes dihedral angles of 12.98 (13), 49.30 (11) and 49.83 (12)° with the pyridine ring, the meth­oxy­phenyl ring and the (tri­fluoro­meth­yl)phenyl ring, respectively. In the crystal, mol­ecules are connected via C—H...O hydrogen bonds, forming chains along [010]. There are also C—H...π and C—F...π inter­actions present, forming a three-dimensional structure.

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In the title compound, C22H19N3O4, the dihedral angle between the furan and pyrazole rings is 82.73 (19)° while the dihedral angles between the furan and pyrazole rings and their attached benzene rings are 31.93 (18) and 1.88 (18)°, respectively. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds generate R22(16) loops. In addition, weak C—H...π and aromatic π–π stacking [minimum centroid–centroid distance = 3.5374 (17) Å] inter­actions are observed.

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In the title compound, C14H12O2, the benzene rings make a dihedral angle of 58.84 (12)°. In the crystal, mol­ecules are linked into chains along the b-axis direction by O—H...O hydrogen bonds. These chains are further linked by C—H...O hydrogen bonds, forming layers parallel to the bc plane.

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In the title compound, C7H6F3NO2, all the non-H atoms except for one of the F atoms lie on a crystallographic mirror plane. In the crystal, the mol­ecules are linked into inversion dimers by pairs of C—H...F inter­actions, forming R22(10) loops. These dimers are connected into C(6) chains along [001] through N—H...O hydrogen bonds. Aromatic π–π stacking inter­actions [centroid-centroid separation = 3.8416 (10) A°] connect the mol­ecules into a three-dimensional network.

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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, C13H13NO3, the conformation across the C=C bond is synperiplanar, the torsion angle of the segment C(ring)—C=C—C(N) being 3.2 (5)°. In the crystal, mol­ecules are linked into inversion dimers, arranged in a zigzag pattern, through two C—H...O inter­actions generating R22(10) and R22(14) motifs. These dimers are arranged in a zigzag pattern in the crystal structure. The mol­ecules are further linked along the c axis through weak C—H...π inter­actions, and weak π...π inter­actions [centroid–centroid separation = 3.9986 (17) Å] are also observed.

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In the title compound, C10H5F5O2, the C=O bonds are syn to one another. In the crystal, mol­ecules are linked into C(9) chains parallel to [101] through weak C—H...O inter­actions, with the O atom adjacent to the –CF3 group acting as the acceptor.

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The asymmetric unit of the title compound, C11H10N4O3, contains two independent mol­ecules in which the benzene rings make dihedral angles of 38.3 (2) and 87.1 (2)° with respect to the triazole rings. In the crystal, the mol­ecules are linked by C—H...O hydrogen bonds, forming chains along [021]. Further, weak C—O...π [3.865 (5) Å, 83.8 (3)°] and N—O...π [3.275 (5) and 3.240 (6) Å, 141.8 (4) and 102.8 (3)°] inter­actions are observed.

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In the title salt, C14H20NO+·Cl, the piperidine ring adopts a chair conformation. In the crystal, the cations and anions are linked by classical N—H...Cl hydrogen bond and weak C—H...Cl and C—H...O hydrogen bonds; the C—H...O hydrogen bonds exhibit R22(14) ring motifs while the C—H...Cl hydrogen bonds link the mol­ecules into chains along the a-axis direction. π–π stacking is observed between parallel phenyl rings of adjacent cations, the centroid–centroid distance being 3.8164 (15) Å.

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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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In the title compound, C7H8N6O2S, the dihedral angle between the imidazole and thia­diazole rings is 70.86 (15)°. In the crystal, mol­ecules are linked into [10-1] chains by N—H...N hydrogen bonds, which incorporate centrosymmetric R22(8) and R22(18) loops. The chains are linked by C—H...O and C—H...N inter­actions, generating a three-dimensional network. Very weak π–π stacking [centroid–centroid distance = 3.901 (17) Å] is also observed.

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In the title compound, C23H20F3N3O3S2, the benzo­imidazole unit makes dihedral angles of 5.02 (1) and 76.42 (1)°, respectively, with the pyridine and methyl­benzene rings; the dihedral angle between the pyridine and methyl­benzene rings is 72.19 (1)°. In the crystal, mol­ecules are connected by weak C—H...F, C—H...O and C—H...N hydrogen bonds. Weak C—H...π inter­actions and π–π stacking [centroid–centroid distance = 3.6485 (14) Å] are also observed. The overall packing shows a three-dimensional architecture. The crystal structure contains a void of 51 Å3, but no solvent mol­ecule (hexane or ethyl acetate) is located within it.
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