S. Sathya

Crystal structure of 4-chloro-N-[2-(piperidin-1-yl)eth-yl]benzamide monohydrate.

In the title compound, C14H19ClN2O2·H2O, the piperdine ring adopts a chair conformation. The dihedral angle between the mean plane of the piperidine ring and that of the phenyl ring is 41.64 (1)°. In the crystal, molecules are linked by O—H⋯N, N—H⋯O and C—H⋯O hydrogen bonds involving the water molecule, forming double-stranded chains propagating along [010].

(E)-3-(4-Hy-droxy-3-meth-oxy-phen-yl)-1-(4-hy-droxy-phen-yl)prop-2-en-1-one.

In the title compound, C16H14O4, there is an intramolecular O—H⋯O hydrogen bond. The benzene rings are inclined to one another by 13.89 (9)°. The prop-2-en-1-one group is twisted slightly, the O=C—Car—Car (ar = aromatic) and C=C—C=O torsion angles being −10.4 (3) and −7.4 (3)°, respectively. In the crystal, molecules are linked by O—H⋯O hydrogen bonds, forming chains along [100]. These chains are further linked by O—H⋯O hydrogen bonds, forming corrugated sheets lying parallel to (010). There are C—H⋯π interactions present within the sheets.

Crystal structure of 2-amino-4-methyl­pyridin-1-ium (2R,3R)-3-carb­oxy-2,3-di­hydroxy­propano­ate monohydrate

The title molecular salt, C6H9N2 +·C4H5O6 −·H2O, crystallized with two 2-amino-4-methylpyridin-1-ium cations, two l-(+)-tartaric acid monoanions [systematic name: (2R,3R)-3-carboxy-2,3-dihydroxypropanoate] and two water molecules in the asymmetric unit. In the crystal, the cations, anions and water molecules are linked via a number of O—H⋯O and N—H⋯O hydrogen bonds, and a C—H⋯O hydrogen bond, forming a three-dimensional structure

Crystal structure of 3-[4-(benz-yloxy)phen-yl]-2,3-di-hydro-1H-benzo[f]chromen-1-one.

In the title compound, C26H20O3, the pyran ring has a distorted half-chair conformation and its mean plane is inclined to the naphthalene ring system, to which it is fused, by 10.79 (9)°. The dihedral angles between the napthalene unit and the benzene and phenyl rings are 54.39 (9) and 52.65 (12)°, respectively, while the benzene and phenyl rings are inclined to one another by 74.80 (14)°. There is a short C—H⋯O contact in the chromen-1-one unit. In the crystal, molecules are linked by two pairs of C—H⋯O hydrogen bonds, forming inversion dimers described by graph set motifs R 2 2(8) and R 2 2(10), giving rise to chains running parallel to (101). The chains are linked via C—H⋯π interactions, forming sheets lying parallel to (010).

Crystal structure of 1-[2,4-bis(4-methoxy-phenyl)-3-azabicyclo[3.3.1]nonan-3-yl]ethanone.

In the title compound, C24H29NO3, the azabicycle contains two six-membered rings, viz. a cyclohexane ring and a piperidine ring. The first adopts a chair conformation and the second a half-chair conformation. The dihedral angle between their mean planes is 86.21 (13)°, indicating that they are almost perpendicular to one another. The dihedral angle between the planes of the 4-methoxyphenyl rings is 17.51 (13)°, and they make dihedral angles of 81.9 (3) and 81.3 (3)° with the ethan-1-one group. In the crystal, molecules are linked by C—H⋯π interactions forming chains along [10-1].

Crystal structure of 4-[(2E)-3-(4-meth-oxy-phen-yl)prop-2-eno-yl]phenyl benzoate.

In the title compound, C23H18O4, the methoxybenzene ring and attached C=C grouping are disordered over two sets of sites in a 0.823 (5):0.177 (5) ratio. The dihedral angles between the central benzene ring and the pendant phenyl and methoxybenzene ring (major orientation) are 51.21 (1) and 51.6 (1)°, respectively. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R 2 2(28) loops.

2'-Hy-droxy-methyl-1'-(4-methyl-phen-yl)-2'-nitro-1',2',5',6',7',7a'-hexa-hydro-spiro-[indoline-3,3'-pyrrolizin]-2-one.

In the title compound, C22H23N3O4, the tolyl ring is almost perpendicular [83.86 (7)°] to the best plane through the eight atoms of the pyrrolizidine ring system. The molecular conformation is stabilized by an intramolecular O—H⋯O hydrogen bond. The crystal packing features inversion dimers with R 2 2(8) motifs linked by pairs of N—H⋯O hydrogen bonds.

Crystal structure of 5-(4-benzyl-oxyphen-yl)-3-(4-meth-oxy-phen-yl)-6-methyl-cyclo-hex-2-en-1-one.

5-(4-Benzyloxyphenyl)-3-(4-methoxyphenyl)-6-methylcyclohex-2-en-1-one crystallized with two independent molecules in the asymmetric unit. The cyclohexene ring adopts an envelope conformation in both molecules, with the C atom to which is attached the central benzene ring as the flap. The crystal packing, is stabilized by C—H⋯π interactions.

5,5,7,12,12,14-Hexamethyl-1,8-bis-(4-nitro-benz-yl)-1,4,8,11-tetra-aza-cyclo-tetra-deca-ne.

The asymmetric unit of the title compound, C30H46N6O4, contains one half-molecule. The C(benzene)—C(CH2)—N—C(—Me) torsion angle is −79.89 (13)° suggesting a synclinal orientation of the nitrobenzene ring with respect to the macrocycle. The conformation of the macrocycle is stabilized by intramolecular N—H⋯N hydrogen bonds.

Crystal structure of (2E)-1-(4-hy­droxy-3-meth­oxy­phen­yl)-3-(4-hy­droxy­phen­yl)prop-2-en-1-one

In the title moleclue, C16H14O4, the dihedral angle between the benzene rings is 16.1 (3)°. The methoxy group is essentially coplanar with the benzene ring to which it is attached, with a C—O—C C torsion angle of 5.5 (9)°. In the crystal, molecules are linked by O—H⋯O and bifurcated O—H⋯(O,O) hydrogen bonds, forming a three-dimensional network. The structure was refined as a two-component inversion twin.