P. S. Patil

4-Chloro-N′-[(Z)-4-nitro­benzyl­idene]benzohydrazide monohydrate

In the title compound, C14H10ClN3O3·H2O, the benzohydrazide group is not planar and the molecule exists in a cis configuration with respect to the methylidene unit. The dihedral angle between the two substituted benzene rings is 38.7 (3)°. In the crystal structure, molecules are linked by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds into a two-dimensional network parallel to the (100) plane. The crystal structure is further stabilized by weak C—H⋯O interactions.

4-Chloro-N′-[(Z)-4-(dimethyl­amino)benzyl­idene]benzohydrazide mono­hydrate

In the title compound, C16H16ClN3O·H2O, the dihedral angle between the two aromatic rings is 44.58 (11)°. The N atom of the dimethylamino group adopts a pyramidal configuration. In the crystal structure, molecules are linked into a two-dimensional network parallel to the (001) plane by intermolecular N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds involving the water molecule and C—H⋯Cl hydrogen bonds. In addition, C—H⋯π interactions are observed.

N′-[(E)-1-Phenyl­ethyl­idene]benzo­hydrazide

The title compound, C15H14N2O, crystallized with two independent molecules in the asymmetric unit. Both molecules are non-planar and have an E configuration with respect to the C=N bond. The dihedral angles between the two benzene rings are 11.1 (2)° in one molecule and 12.40 (19)° in the other. In the crystal structure, the molecules are linked by N—H⋯O hydrogen bonds and weak C—H⋯O interactions into infinite one-dimensional chains along [1 0 0]. The crystal structure is further stabilized by N—H⋯O hydrogen bonds, weak C—H⋯O and very weak C—H⋯π interactions.

2-[(E)-2-(3-Hydroxy-4-methoxyphenyl)ethenyl]-1-methylquinolinium 4-bromobenzenesulfonate

# 2006 International Union of Crystallography All rights reserved The title compound, C19H18NO2 + C6H4ClO3S , exhibits nonlinear optical properties. The cation is almost planar and the benzene ring of the anion makes dihedral angles of 48.97 (6) and 51.63 (7) with the mean planes through the quinolinium system and the benzene ring of the cation, respectively. The anions are linked by C—H O interactions, forming a chain along the a axis, while the cations are stacked along the a axis. The anionic chains and the cationic stacks are alternately arranged.

Synthesis and crystal structure of 1-(4-fluorophenyl)-3-(3,4,5-trimethoxyphenyl)-2-propen-1-one

The title compound C18 H17FO4 was synthesized and recrystallized from an organic solution. The crystal structure of 1-(4-fluorophenyl)-3-(3,4,5-trimethoxyphenyl)-2-propen-1-one was determined by X-ray diffraction analysis. The title compound crystallizes in the monoclinic crystal class in the space group P21/c with cell parameters a = 7.6930(6) Å, b = 15.2320(11)Å, c = 14.1280(12) Å, β = 106.596(3)°, Z = 4, and V = 1586.6(2) Å3. The unsaturated keto group is not strictly planar and is in a s-cis conformation.

4-(4-Bromo­benzyl­ideneamino)-1-(diphenyl­amino­meth­yl)-3-[1-(4-isobutyl­phen­yl)eth­yl]-1H-1,2,4-triazole-5(4H)-thione

In the title compound, C34H34BrN5S, the two phenyl rings of the diphenylaminomethyl group are inclined at an angle of 73.86 (8)° and they form dihedral angles of 74.04 (8) and 48.74 (8)° with the triazole ring. Intramolecular C—H⋯S hydrogen bonds generate S(6) and S(5) ring motifs. The crystal structure is stabilized by weak C—H⋯π interactions.

N′-[(Z)-4-(Dimethyl­amino)benzyl­idene]-4-nitro­benzohydrazide mono­hydrate

In the asymmetric unit of the title compound, C16H16N4O3·H2O, there are two symmetry-independent hydrazide molecules with almost identical geometries, and two independent water molecules. The dihedral angles between the two benzene rings in the two hydrazide molecules are 0.11 (5) and 0.77 (5)°. In one molecule, an intramolecular C—H⋯O hydrogen bond generates a ring of graph-set motif S(5). Intermolecular N—H⋯O, O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds and π–π stacking interactions between the benzene rings [centroid–centroid distances in the range 3.5021 (6)–3.6403 (6) Å] are observed, together with O⋯O [2.7226 (11) Å], O⋯N [2.7072 (10) Å] and N⋯O [2.7072 (10)–2.8582 (12) Å] short contacts. The hydrazine molecules are stacked along the b axis and adjacent molecules are linked by water molecules.

3-[1-(4-Isobutyl-phen-yl)eth-yl]-6-(4-methyl-phen-yl)-1,2,4-triazolo[3,4-b][1,3,4]thia-diazole.

In the title compound, C22H24N4S, the methylphenyl and isobutylphenyl rings are inclined at an angle of 79.98 (1)° and they form dihedral angles of 4.59 (1) and 75.47 (1)°, respectively, with the triazolothiadiazole unit. An intramolecular C—H⋯S hydrogen bond generates an S(5) ring motif. The crystal structure is stabilized by intermolecular C—H⋯N hydrogen bonds and weak C—H⋯π and π–π interactions [centroid–centroid distances between the thiadiazole ring and a symmetry-related phenyl ring and between the triazole ring and the phenyl ring range from 3.5680 (8) to 3.7313 (8) Å].

1-(4-Bromo-phen-yl)-3-(4-ethoxy-phen-yl)-prop-2-en-1-one.

The title compound, C17H15BrO2, consists of two substituted benzene rings connected by a prop-2-en-1-one group. The molecule is nearly planar and adopts an E configuration. The dihedral angle between the two benzene rings is 8.51 (19)°. The enone plane makes dihedral angles of 11.06 (19) and 7.69 (19)°, respectively, with the bromophenyl and ethoxyphenyl rings. The molecules are linked by C—H⋯O hydrogen bonds to form a zigzag ribbon-like structure along the b direction. The crystal structure is stabilized by weak intra- and intermolecular C—H⋯O interactions.

(E)-1-(3-Bromo-phen-yl)-3-(4-ethoxy-phen-yl)prop-2-en-1-one.

The title compound, C17H15BrO2, adopts an E configuration. The dihedral angle between the two benzene rings is 10.09 (11)°. The enone plane makes dihedral angles of 12.05 (11) and 9.87 (11)°, respectively, with the bromophenyl and ethoxyphenyl rings. The ethoxy group is nearly coplanar with the attached benzene ring. In the crystal structure, the molecules are linked by C—H⋯O hydrogen bonds, forming a zigzag ribbon-like structure along the b-axis direction.