A. SubbiahPandi

(E)-1-[4-(Prop-2-yn-1-yl­oxy)phen­yl]-3-(3,4,5-trimeth­oxy­phen­yl)prop-2-en-1-one

The molecule of the title chalcone derivative, C21H20O5, consists of two substituted aromatic rings bridged by a prop-2-en-1-one group. The dihedral angle between the two benzene rings is 28.7 (7)°. In the crystal, molecules are linked into C(10) chains running along the a axis by intermolecular C—H⋯O hydrogen bonds, and the chains are cross-linked via C—H⋯π interactions.

Crystal structures of ethyl (2S*,2′R*)-1′-methyl-2′′,3-dioxo-2,3-di­hydro­dispiro­[1-benzo­thio­phene-2,3′-pyrrolidine-2′,3′′-indoline]-4′-carboxyl­ate and ethyl (2S*,2′R*)-5′′-chloro-1′-methyl-2′′,3-dioxo-2,3-di­hydro­dispiro­[1-benzo­thio­phene-2,3′-pyrrolidine-2′,3′′-indoline]-4′-carboxyl­ate

The title compounds, (I) and (II), are dispiro-indole-pyrrolidine-benzothiophene derivatives, with (II) having a chlorine substituent on the oxoindole unit. As a result, the conformation of the two molecules differs in the angle of inclination of the indole moiety with respect to the benzothiophene ring system, with a dihedral angle of 71.59 (5) in (I) and 82.27 (7)° in (II).

2,3,4,9-Tetra­hydro-1H-carbazole

In the title compound, C12H13N, two methylene C atoms of the cyclohexene ring are disordered over two sites with occupancies of 0.591 (10) and 0.409 (10); both disorder components adopt half-chair conformations. The crystal structure is stabilized by intermolecular N—H⋯π and C—H⋯π interactions.

N-[(2-Hydr­oxy-1-naphthyl)(3-nitro­phenyl)meth­yl]acetamide

The title compound, C19H16N2O4, is of interest as a precursor to biologically active substituted quinolines and related compounds. The dihedral angle between the naphthalene ring system and the benzene ring is 81.9 (1)°. The crystal structure is stabilized by N—H⋯O intermolecular hydrogen bonds, linking the molecules into pairs around a center of symmetry. The crystal structure is further stabilized by intermolecular O—H⋯O hydrogen bonds, which link the molecules into chains running along a axis. An intramolecular C—H⋯O short contact is also present.

3,3′-(p-Phenyl­ene)bis­(3,4-dihydro-2H-1,3-benzoxazine)

Molecules of the title compound, C22H20N2O2, are situated on crystallographic centres of symmetry. The oxazinane ring adopts a sofa conformation. Molecules are linked into cyclic centrosymmetric dimers via C—H⋯O hydrogen bonds with the motif R 2 2(6). In addition to the C—H⋯O interactions, the crystal structure is also stabilized by C—H⋯π interactions.

4-(2,4-Dichlorophenyl)-2-(1H-indol-3-yl)-6-(2-pyridyl)-1,4-dihydropyridine-4-carbonitrile

The title compound, C25H16Cl2N4, has intramolecular N—H⋯N and C—H⋯Cl hydrogen bonds. In the crystal structure, molecules are linked through N—H⋯N hydrogen bonds, forming a centrosymmetric R 2 2(16) dimer.

Crystal structure of 4-(2-azido-phen-yl)-5-benzoyl-2-(1H-indol-3-yl)-1H-pyrrole-3-carbo-nitrile.

In the title compound, C26H16N6O, the dihedral angles between the central pyrrole ring and the pendant indole ring system (r.m.s. deviation = 0.027 Å) and the azide-bearing benzene ring are 37.56 (8) and 51.62 (11)°, respectively. The azide group is almost coplanar with its attached benzene ring [C—C—N—N = 3.8 (3)°]. The benzoyl benzene ring is disordered over two orientations twisted with respect to each other by 9.29 (8)° in a 0.514 (2):0.486 (2) ratio. In the crystal, inversion dimers linked by pairs of Np—H⋯O (p = pyrrole) hydrogen bonds generate R 2 2(10) loops. A second inversion dimer arises from a pair of Ni—H⋯Nc (i = indole and c = cyanide) hydrogen bonds, which generates an R 2 2(16) loop. Together, the hydrogen bonds lead to [011] chains in the crystal.

Ethyl 1''-benzyl-2''-oxo-2',3',5',6',7',7a'-hexa-hydro-1'H-di-spiro-[indeno-[1,2-b]quinoxaline-11,2'-pyrrolizine-3',3''-indoline]-1'-carboxyl-ate monohydrate.

In the title compound, C38H32N4O3·H2O, the quinoxaline–indene and pyrrolizine systems are essentially planar, with maximum deviations from their mean planes of 0.162 and 0.563 Å, respectively. The pyrrolizine ring forms dihedral angles of 88.53 (5) and 89.95 (8)° with the quinoxaline–indene system and the indoline ring, respectively. The central pyrrolidine ring has an envelope conformation with the C atom bearing the quinoxaline-indene system as the flap. The pyrrolidine ring of the indole system adopts an envelope conformation with the C atom bonded to the pyrrolizine ring N atom as the flap. The five-membered ring attached to the central pyrolidine ring adopts a twisted conformation. In the crystal, O—H⋯N and O—H⋯O hydrogen bonds between water molecules and pyrrolizine N and carbonyl O atoms together with C—H⋯O interactions result in chains along [100].

3-[2-(9-Ethyl-9H-carbazol-3-yl)-6-methyl-3-quinol-yl]propan-1-ol.

In the title compound, C27H26N2O, the mean planes through the carbazole and quinoline ring systems form a dihedral angle of 67.23 (5)°. Molecules are linked into cyclic centrosymmetric dimers by O—H⋯N hydrogen bonds, and C—H⋯π interactions with the pyridine ring of the quinoline ring system as an acceptor. The dimers are linked through C—H⋯O hydrogen bonds.

4-(4-Bromo­phen­yl)-6-(1H-indol-3-yl)-2,2′-bipyridine-5-carbonitrile

In the title compound, C25H15BrN4, the two pyridine rings lie in a common plane [r.m.s. deviation = 0.023 (2) Å], whereas the bromophenyl and indole rings are twisted away from this plane by 52.82 (12) and 28.02 (10)°, respectively. The crystal structure is stabilized by intermolecular N—H⋯N interactions.