B. Gunasekaran

(E)-1-[2-(2-Nitro­styr­yl)-1-phenyl­sulfonyl-1H-indol-3-yl]propan-1-one

In the title compound, C25H20N2O5S, the phenyl ring makes dihedral angles of 89.88 (8) and 13.98 (8)°, respectively, with the indole ring system and the nitrobenzene ring. The dihedral angle between the indole ring system and the nitrobenzene ring is 88.48 (11)°. The molecular structure is stabilized by a weak intramolecular C—H⋯O interaction. In the crystal, π–π interactions, with centroid–centroid distances of 3.6741 (18) and 3.8873 (17) Å, link the molecules into layers parallel to the ab plane.

Bis(2,3-dimeth-oxy-10-oxostrychni-din-ium) phthalate nonahydrate.

The asymmetric unit of the title compound 2C23H27N2O4 +·C8H4O4 2−·9H2O, contains a cation, an anionon a twofold axis and four and half molecules of water, one of which is located on the twofold axis. In the cation, both fused pyrrolidine rings exhibit twisted conformations, while the piperidine rings adopt screw–boat and boat conformations. In the crystal, the components are linked by N—H⋯O and O—H⋯O hydrogen bonds. The brucinium cations form typical undulating head-to-tail ribbon structuresalong the a-axis direction, which associate with the carboxy phthalate and the water molecules.

Methyl 11,14,16-triphenyl-8,12-dioxa-14,15-di-aza-tetra-cyclo-[8.7.0.0(2,7).0(13,17)]hepta-deca-2(7),3,5,13(17),15-penta-ene-10-carboxyl-ate.

In the title compound, C33H26N2O4, the pyrazole ring makes dihedral angles of 15.13 (7) and 60.80 (7)° with the adjacent phenyl rings. Both dihydropyran rings exhibit half-chair conformations. A weak intramolecular C—H⋯O interaction occurs. In the crystal, molecules are linked into inversion dimers through pairs of C—H⋯N interactions. Weak C—H⋯π interactions are also observed.

Crystal structure of N-[(morpholin-4-yl)(thio­phen-2-yl)meth­yl]benzamide

In the title compound, C16H18N2O2S, the morpholine ring adopts a chair conformation. The thiophene ring makes a dihedral angle of 63.54 (14)° with the mean plane of the four C atoms [maximum deviation = 0.010 (3) Å] of the morpholine ring. The benzamide ring is disordered, with four C atoms occupying two sets of sites, with a refined occupancy ratio of 0.502 (4):0.498 (4). These two rings are inclined to one another by 85.2 (4)° and to the thiophene ring by 72.7 (3) and 13.0 (3)° for the major and minor components, respectively. In the crystal, molecules are linked via N—H⋯O hydrogen bonds, forming chains along [001].

Crystal structure of ethyl 6-(chloro­meth­yl)-4-(4-chloro­phen­yl)-2-oxo-1,2,3,4-tetra­hydro­pyrimidine-5-carboxyl­ate

In the title compound, C14H14Cl2N2O3, the chlorophenyl ring makes a dihedral angle of 87.08 (9)° with the tetrahydropyrimidine ring. There is a short intramolecular C—H⋯O contact present. In the crystal, molecules are linked via pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R 2 2(8) ring motif. The dimers are linked via a second pair of N—H⋯O hydrogen bonds, this time enclosing an R 4 4(20) ring motif, forming ribbons along [100]. The ribbons are linked via C—H⋯O hydrogen bonds, forming sheets lying parallel to (001). The terminal ethyl group is disordered over two positions with an occupancy ratio of 0.654 (17):0.346 (17).

(E)-2-Bromo-1-[2-(2-nitro-styr-yl)-1-phenyl-sulfonyl-1H-indol-3-yl]ethanone.

In the title compound C24H17BrN2O5S, the phenyl ring makes dihedral angles of 85.4 (2) and 8.8 (2)° with the indole ring system and the nitrobenzene ring, respectively, while the indole ring system and nitrobenzene ring make a dihedral angle of 80.1 (2)°. In the crystal, weak C—H⋯O interactions link the molecules, forming a two-dimensional network parallel to the bc plane.

(E)-2-[(2-Formyl-phen-oxy)meth-yl]-3-(4-iso-propyl-phen-yl)acrylo-nitrile.

In the title compound, C20H19NO2, the dihedral angle between the benzene rings is 77.12 (8)°. The terminal isopropyl group is disordered over two orientations, with site occupancies of 0.720 (14) and 0.280 (14). In the crystal, molecules are linked through a weak C—H⋯O interaction, forming a zigzag chain along the c-axis direction.

Bis(creatininium) 3-nitro­phthalate monohydrate

In the title hydrated molecular salt, 2C4H8N3O+·C8H3NO62−·H2O, the dihedral angles between the benzene ring and the nitro group and the carboxylate groups are 48.0 (2), 55.3 (2) and 60.7 (2)°, respectively. In the crystal, the components are linked by N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds, generating a two-dimensional network parallel to (102).

Crystal structure of 3-(morpholin-4-yl)-1-phenyl-3-(pyridin-2-yl)propan-1-one

In the title compound C18H20N2O2, the morpholine ring adopts a chair conformation with the exocyclic N—C bond in an equatorial orientation. The N atom of the morpholine ring and the C atom of the carbonyl group are in an anti conformation about the central C—C bond [torsion angle = −162.92 (11)°] and the dihedral angle between the planes of the benzene ring and the pyridine ring is 83.30 (5)°. In the crystal, pairs of very weak C—H⋯π interactions link the molecules into inversion dimers.

1-[6-(1H-Indol-1-yl)pyridin-2-yl]-1H-indole-3-carbaldehyde

In the title compound, C22H15N3O, the dihedral angle between the two indole units is 33.72 (3)°. The molecular structure features a weak intramolecular C—H⋯N interaction. In the crystal, weak C—H⋯O and C—H⋯π interactions, forming a two-dimensional network parallel to the bc plane.