E. Govindan

Bis(1,10-phenanthrolin-1-ium) tetra-chlorido-zincate monohydrate.

In the crystal structure of the title compound, (C12H9N2)2[ZnCl4]·H2O, the two independent 1,10-phenanthrolinium cations are bridged by the water molecule and the tetrahedral tetrachloridozincate anion via N—H⋯O, O—H⋯Cl and N—H⋯Cl hydrogen bonds, forming chains along [100]. The chains are linked via C—H⋯Cl hydrogen bonds and a number of π–π interactions [centroid–centroid distances vary from 3.5594 (14) to 3.7057 (13) Å], forming a three-dimensional network. In each 1,10-phenanthrolinium cation, there is a short N—H⋯N interaction.

(E)-Methyl 3-(4-ethyl­phen­yl)-2-{2-[(E)-(hy­droxy­imino)­meth­yl]phen­oxy­meth­yl}acrylate

In the title compound, C20H21NO4, the two benzene rings are almost perpendicular to each other, making a dihedral angle of 86.1 (7)°. The hydroxyethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane of the hydroxyethanimine [C=N—OH] group being 0.011 (1) Å for the O atom. An intramolecular C—H⋯O hydrogen bond occurs. The molecules are linked into cyclic centrosymmetric R 2 2(6) dimers via O—H⋯N hydrogen bonds. Intermolecular C—H⋯O hydrogen bonds link the molecules, forming a C(8) chain along the a axis. The crystal packing is further stabilized by C—H⋯π interactions.

(4S)-3-Methyl-5,6,7,8-tetra­hydro-4H-spiro­[[1,2]oxazolo[5,4-b]quinoline-4,3′-indole]-2′,5-dione

In the title compound, C18H15N3O3, the dihedral angle between the mean planes of the quinoline and indole ring systems [r.m.s. deviations = 0.189 (2) and 0.027 (2) Å, respectively] is 88.65 (5)°. The cyclohexene ring of the quinoline ring system adopts an envelope conformation with the central –CH2– C atom as the flap. In the crystal, molecules are linked by two pairs of N—H⋯O hydrogen bonds, forming inversion dimers, and enclosing R 2 2(14) ring motifs. This arrangement results in the formation of chains propagating along [100].

Bis(isoquinolin-2-ium) tetra­chlorido­zincate dihydrate

In the title compound, (C9H8N)2[ZnCl4]·2H2O, the tetrachloridozincate ion is located on a twofold rotation axis with the Zn atom on a special position. The crystal packing is stabilized by N—H⋯O and O—H⋯Cl interactions.

cis-Bromido(methyl­amine)­bis­(propane-1,3-di­amine)­cobalt(III) dibromide

In the title compound, [CoBr(CH5N)(C3H10N2)2]Br2, the cobaltIII ion has a distorted octahedral coordination environment and is surrounded by four N atoms in the equatorial plane, with an additional N atom and the Br atom occupying the axial positions. In the crystal, the complex cation and the two counter anions are linked via N—H⋯Br and C—H⋯Br hydrogen bonds, forming a three-dimensional network.

Ethyl 1′′-benzyl-1′-methyl-2′′-oxodi­spiro­[indeno­[1,2-b]quinoxaline-11,3′-pyrrolidine-2′,3′′-indoline]-4′-carboxyl­ate

In the title compound, C36H30N4O3, the quinoxaline–indene system is roughly planar, with a maximum deviation from the mean plane of 0.218 Å for the C atom shared with the central pyrrolidine ring. This latter ring forms dihedral angles of 84.54 (7) and 83.91 (8)° with the quinoxaline–indene system and the indole ring, respectively. The central pyrrolidine ring has an envelope conformation with the N atom as the flap, while the pyrrolidine and five-membered rings of the indole group adopt twisted conformation and envelope (with the C atom bearing the quinoxaline–indene system as the flap) conformations, respectively. In the crystal, molecules are linked via weak C—H⋯N hydrogen bonds, forming a chain running along [100].

Methyl 5′′-chloro-1′,1′′-dimethyl-2,2′′-dioxodi­spiro­[indoline-3,2′-pyrrolidine-3′,3′′-indoline]-4′-carboxyl­ate

In the title compound, C22H20ClN3O4, the central pyrrolidine ring adopts an envelope conformation on the N atom. The indolinone systems are individually roughly planar, with maximum deviations from their mean planes of 0.130 Å for the spiro C atom of the indolinone unit and 0.172 Å for the carbonyl C atom of the 5-chloro-1-methylindolinone unit. They make dihedral angles of 77.7 (8) and 86.1 (8)° with the mean plane through the central pyrrolidine ring. In the crystal, molecules are linked by N—H⋯O hydrogen bonds supported by C—H⋯O contacts into chains along the ab diagonal. The structure also features C—H⋯O hydrogen bonds, forming R 2 2(8) and R 2 2(16) rings and generating a three-dimensional array.

(E)-Methyl 2-({2-eth-oxy-6-[(E)-(hy-droxy-imino)-meth-yl]phen-oxy}meth-yl)-3-phenyl-acrylate.

In the title compound, C20H21NO5, the dihedral angle between the mean planes through the two rings is 47.1 (8)°. The enoate group assumes an extended conformation. The hydroxyethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane being 0.061 (1) Å for the O atom. In the crystal, molecules are linked into cyclic centrosymmetric dimers with an R 2 2(6) motif via pairs of O—H⋯N hydrogen bonds. Intermolecular C—H⋯O hydrogen bonds form a C(8) chain along the b axis. The crystal packing is further stabilized by C—H⋯π interactions.

(E)-2-({2-[(E)-(Hydroxyimino)methyl]phenoxy}methyl)-3-o-tolylacrylonitrile

In the title compound, C18H16N2O2, the dihedral angle between the mean planes through the two benzene rings is 56.8 (6)°. The enoate group assumes an extended conformation. The hydroxyethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane being 0.047 (1) Å for the hydroxyimino O atom. In the crystal, the molecules are linked into cyclic centrosymmetric dimers with R 2 2(6) motifs via O—H⋯N hydrogen bonds.

Isopropyl 1-benzoyl-4-benzo­yloxy-2,6-di­phenyl-1,2,3,6-tetrahydropyridine-3-carboxyl­ate

In the title compound, C35H31NO5, the piperidine ring has an envelope conformation, with the phenyl-substituted C atom adjacent to the methylene C atom as the flap. This flap atom deviates by 0.633 (2) Å from the mean plane of the other five essentially coplanar atoms in the ring (r.m.s. deviation = 0.044 Å). Intramolecular C—H⋯O hydrogen bonds form S(7) and S(9) ring motifs. In the crystal, molecules are linked by pairs of C—H⋯O hydrogen bonds, forming inversion dimers with R 2 2(16) loops.