Lin-Hai Jing

(E)-1-(4-Nitro­phen­yl)-3-phenyl­prop-2-en-1-one

In the title compound, C15H11NO3, the configuration of the keto group with respect to the olefinic double bond is s–cis. The two benzene rings form a dihedral angle of 5.00 (5)°. The molecules are linked into a two-dimensional network parallel to (04) by C—H⋯O hydrogen bonds.

(E)-3-(4-Fluoro-phen-yl)-1-phenyl-2-propen-1-one.

In the title compound, C15H11FO, the configuration of the keto group with respect to the olefinic double bond is s–cis. The dihedral angle between the planes of the two benzene rings is 10.61 (10)°. The crystal packing is stabilized by C—H⋯π interactions involving both benzene rings.

3-Nitro-N-(8-quinol-yl)benzamide.

The title compound, C16H11N3O3, crystallizes with two independent molecules which are almost identical to each other in the asymmetric unit. The dihedral angle between the quinoline ring system and the nitrobenzene ring is 51.04 (9)° in one of the molecules and 48.91 (9)° in the other. The crystal packing is stabilized by C—H⋯O hydrogen bonds and π–π interactions, with a centroid–centroid distance of 3.6010 (15) Å.

2-Nitro-N-(8-quinolyl)benzamide.

In the title compound, C16H11N3O3, the amide group is twisted away from the quinoline ring system and nitrobenzene ring by 8.02 (1)° and 54.92 (1)°, respectively. The crystal packing is stabilized by intermolecular C—H⋯O hydrogen bonds, and π–π interactions between the quinoline ring systems of inversion-related molecules, with a centroid–centroid distance of 3.4802 (13) Å.

4-Nitro-N-(8-quinol-yl)benzamide.

In the title compound, C16H11N3O3, the amide group is twisted away from the plane of the quinoline benzene ring by 3.93 (5)°, but is twisted away from the nitrobenzene ring by 22.68 (4)°. A weak intramolecular C—H⋯O hydrogen bond is observed. In the crystal structure, molecules are linked into a chain along the a axis by intermolecular C—H⋯O hydrogen bonds.

(E)-1-(2-Nitro-ethen-yl)naphthalene.

The title molecule, C12H9NO2, adopts a trans configuration about the olefinic double bond. The dihedral angle between the naphthalene ring system (r.m.s. deviation = 0.012 Å) and the nitroethenyl group (r.m.s. deviation = 0.032 Å) is 12.66 (5)°. The molecules are linked into a two-dimensional network parallel to the bc plane by C—H⋯O hydrogen bonds. The substituted benzene rings in adjacent networks are stacked with a centroid–centroid distance of 3.6337 (11) Å, indicating π–π interactions.

N,N′-Bis(4-bromo­phen­yl)naphthalene-1,4-dicarboxamide N,N-dimethyl­acetamide disolvate

The title compound, C24H16Br2N2O2·2C4H9NO, crystallizes in an anti C=O orientation. The two amide groups are twisted away from the naphthalene ring system by 62.67 (8) and 75.93 (7)°. The crystal packing is stabilized by N—H⋯O and C—H⋯O hydrogen bonds. Each of the dimethylacetamide solvent molecules is disordered over two positions, with occupancy ratios of 0.556 (7):0.444 (7) and 0.654 (7):0.346 (7).

(E)-1-Nitro-4-(2-nitro­ethen­yl)benzene

The asymmetric unit of the title compound, C8H6N2O4, consists of two independent molecules with similar geometries, each adopting a trans configuration about the olefinic double bond. The two molecules are both almost planar (r.m.s. deviations = 0.034 and 0.035 Å) and form a dihedral angle of 83.62 (2)°. Short N⋯O contacts [2.834 (3)–2.861 (3) Å] are observed between the nitro groups of neighbouring molecules, with the O atom located directly atop the p orbital of the N atom. In the crystal, the molecules are linked into a three-dimensional network by the N⋯O interactions and by C—H⋯O hydrogen bonds.

Bis{[1-(tert-butoxy-carbonyl)-pyrrolidin-2-yl]meth-yl} carbonate.

The asymmetric unit of the title compound, C21H36N2O7, consists of two independent half-molecules, the other halves being generated by twofold rotational axes. The two independent half-molecules are related by a pseudo-inversion center. In one, the pyrrolidine ring adopts a twist conformation whereas in the other it is in an envelope conformation. The crystal packing is stabilized by C—H⋯O hydrogen bonds.

1,3-Bis(2-quinolylcarbon-yl)-1H,3H-2,1,3-benzothia-diazole 2-oxide.

In the title compound, C26H16N4O3S, the thiadiazole ring adopts an envelope conformation, with the S atom occupying the flap position. The dihedral angle between the two quinoline ring systems is 55.32 (8)°. In the crystal, the molecules are linked into chains along [010] by C—H⋯O hydrogen bonds. The chains are connected via π–π interactions involving one of the pyridine rings [centroid–centroid distance = 3.5558 (18) Å].