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In the title mol­ecule, C17H13NO2, the phenyl ring is inclined to the quinoline ring system by 43.53 (4)°. In the crystal, mol­ecules are linked via C—H...O hydrogen bonds, forming double-stranded chains propagating along [011]. These chains are linked via π–π inter­actions involving inversion-related quinoline rings; the shortest centroid–centroid distance is 3.6596 (17) Å.

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The title mol­ecule, C15H12ClNO, features a di­hydro­quinolin-4(1H)-one moiety attached to a chloro­benzene ring. The heterocyclic ring has a half-chair conformation with the methine C atom lying 0.574 (3) Å above the plane of the five remaining atoms (r.m.s. deviation = 0.0240 Å). The dihedral angles between the terminal benzene rings is 77.53 (9)°, indicating a significant twist in the mol­ecule. In the crystal, supra­molecular zigzag chains along the c-axis direction are sustained by N—H...O hydrogen bonds. These are connected into double chains by C—H...π inter­actions.

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In the title mol­ecule, C16H15NO, the tetra­hydro­pyridine ring is in a sofa conformation with the methine C atom forming the flap. The dihedral angle between the benzene rings is 80.85 (8)°. In the crystal, mol­ecules are arranged in alternating double layers parallel to (100) and are connected along [001] by N—H...O hydrogen bonds. In addition, weak C—H...π inter­actions are observed.

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In the title mol­ecule, C14H17NO, the 5,5-di­methyl­cyclo­hex-2-enone moiety is attached to an aniline group, the dihedral angle subtended [54.43 (3)°] indicating a significant twist. The hexaneone ring has a half-chair conformation with the C atom bearing two methyl groups lying 0.6384 (8) Å above the plane of the five remaining atoms (r.m.s. deviation = 0.0107 Å). The crystal packing can be described as alternating layers parallel to (-101), which are consolidated by N—H...O hydrogen bonds and C—H...π inter­actions.

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In the title compound, C13H12ClNO2, the dihedral angle between the planes of the quinoline ring system (r.m.s. deviation = 0.029 Å) and the ester group is 54.97 (6)°. The C—O—C—Cm (m = meth­yl) torsion angle is −140.62 (16)°. In the crystal, mol­ecules inter­act via aromatic π–π stacking [shortest centroid–centroid separation = 3.6774 (9) Å] generating (010) sheets.

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In the title mol­ecule, C13H13N3O2, the planes of the benzene and imidazole rings form a dihedral angle of 7.72 (5)°. In the crystal, mol­ecules are linked by weak C—H...N and C—H...O hydrogen bonds, forming layers parallel to (100). A weak C—H...π inter­action connects these layers into a three-dimensional network. A π–π stacking inter­action, with a centroid–centroid distance of 3.5373 (9) Å, is also observed.

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In the title compound, C14H14ClNO4, the dihedral angle between the quinoline ring system (r.m.s. deviation = 0.0142 Å) and ester planes is 18.99 (3)°. The C—O—C—Cm (m = meth­yl) torsion angle is −172.08 (10)°, indicating a trans conformation. In the crystal, the mol­ecules are linked by C—H...O and C—H...N inter­actions, generating layers lying parallel to (101). Aromatic π-π stacking [centroid–centroid distances = 3.557 (2) and 3.703 (2)Å] links the layers into a three-dimensional network.

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In the asymmetric unit of the title compound, C13H13N3O3, the 2-(2-methoxphen­yl)ethenyl unit is connected to the methyl-nitro­imidazole 1-methyl-4-nitro-1H-imidazole moiety. The mol­ecule is quasi-planar and the planes of the two rings form a dihedral angle of 0.92 (11)°. The crystal packing can be described as layers parallel to the (011) plane, stabilized by inter­molecular C—H...O hydrogen bonding, resulting in the formation of an infinite three-dimensional network linking these layers. Strong π–π stacking inter­actions are observed, viz. benzene–benzene, imidazole–imidazole and benzene–imidazole rings, with centroid–centroid distances of 3.528 (2), 3.457 (2) and 3.544 (2) Å, respectively. Intensity statistics indicated twinning by non-merohedry, with refined weighs of the twin components of 0.3687:0.6313.
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