N,N′-[1,4-Phenyl­enebis(methyl­ene)]bis­(N,N-diethyl­ethanaminium) dibromide

In the crystal structure of the title compound, C₂₀H₃₈N₂²⁺·2Br⁻, the centroid of the aromatic ring is located on an inversion center, so that the asymmetric unit consists of one-half mol­ecule of the dication and one bromide anion. C—H...Br inter­actions connect the two components into a three-dimensional network. An intra­molecular C—H...π inter­action is also observed.

tert-Butyl 2-(1H-imidazol-1-yl)acetate

In the title compound, C₉H₁₄N₂O₂, the imidazole ring and the acetate O—C=O plane make a dihedral angle of 80.54 (12)°. In the crystal, mol­ecules are connected via pairs of C—H...O hydrogen bonds, forming centrosymmetric dimers.

A triclinic polymorph of (E)-2-(1-hy­droxy-3-phenyl­prop-2-en-1-yl­idene)-4,5-dimeth­oxy­cyclo­pent-4-ene-1,3-dione

The title compound, C₁₆H₁₄O₅, is a triclinic polymorph of a previously reported monoclinic structure [Hosseinzadeh et al. (2011). Acta Cryst. E67, o1544]. The mol­ecule is roughly planar, the r.m.s. deviation from the least-squares plane of all non-H atoms being 0.092 Å. In the crystal, adjacent mol­ecules are linked through C—H...O hydrogen bonds into an infinite two-dimensional network parallel to (011). The layers are further connected via C—H...π inter­actions, forming a three-dimensional structure. Intra­molecular O—H...O and C—H...O hydrogen bonds are also observed.

tert-Butyl 2-(1H-benzimidazol-1-yl)acetate

In the title compound, C₁₃H₁₆N₂O₂, the planes of the benzimidazole ring system and the acetate O—C=O fragment make a dihedral angle of 84.5 (3)°. In the crystal, mol­ecules are connected through C—H...N hydrogen bonds to form infinite chains in the [-110] direction.

1,5-Bis(2-oxoindolin-3-yl­idene)thio­carbonohydrazide tetra­hydro­furan monosolvate

In the thio­carbonohydrazide mol­ecule of the title compound, C₁₇H₁₂N₆O₂S·C₄H₈O, the terminal indolin-2-one ring systems make a dihedral angle of 20.13 (6)° with each other. Two intra­molecular N—H...O hydrogen bonds are present, each of which generates an S(6) ring. In the crystal, N—H...O hydrogen bonds lead to a mol­ecular chain running along the b axis. The tetra­hydro­furan solvent mol­ecule is disordered over two orientations in a 0.561 (11):0.439 (11) ratio.

N,N′-{[Ethane-1,2-diylbis(­oxy)]bis­(ethane-2,1-di­yl)}bis­(4-methyl­benzene­sulfonamide)

The asymmetric unit of the title compound, C₂₀H₂₈N₂O₆S₂, contains one half-mol­ecule, related to the other half by a twofold rotation axis. The two aromatic rings of the mol­ecule make a dihedral angle of 50.91 (7)°. The O—CH₂—CH₂—O and N—CH₂—CH₂—O fragments both adopt gauche conformations, with torsion angles of 76.0 (4) and 70.4 (3)°, respectively. In the crystal, adjacent mol­ecules are linked through N—H...O hydrogen bonds into chains along the a-axis direction. The chains are further connected via C—H...O inter­actions into a two-dimensional supra­molecular network in the ac plane.

(3Z,3′E)-3,3′-[Cyclo­hexane-1,2-diylbis(aza­nylyl­idene)]bis­(indolin-2-one) N,N-dimethyl­formamide monosolvate dihydrate

In the Schiff base mol­ecule of the title compound, C₂₂H₂₀N₄O₂·C₃H₇NO·2H₂O, the cyclo­hexane ring adopts a chair conformation with the two imine groups linked at the equatorial positions. The two indolin-2-one ring systems make a dihedral angle of 65.63 (5)°. In the crystal, the Schiff base mol­ecules are connected through bifurcated N—H...(O,N) hydrogen bonds, forming inversion dimers. The water molecules link the dimers and the dimethylformamide molecules via O—H...O, O—H...N and N—H...O hydrogen bonds. Together with C—H...π and π–π [centroid–centroid distance = 3.3889 (10) Å] inter­actions a three-dimensional supra­molecular structure is formed.

5-Hy­droxy-6-[(E)-2-phenyl­ethen­yl]-5,6-dihydro-2H-pyran-2-one isolated from Goniothalamus ridleyi

In the title compound, C₁₃H₁₂O₃, the pyran ring adopts a half-chair conformation with a C atom deviating from the least-squares plane of the remaining ring atoms by 0.606 (2) Å. This plane and that of the benzene ring make a dihedral angle of 44.18 (6)°. In the crystal, mol­ecules are linked through O—H...O hydrogen bonds into infinite chains along the b axis, and these chains are cross-linked by C—H...O hydrogen bonded into sheets lying parallel to the bc plane. The layers are further connected via C—H...π inter­actions to form a three-dimensional supra­molecular structure.

5-Methyl-1H-indole-3-carbaldehyde

The title mol­ecule, C₁₀H₉NO, is almost planar with an r.m.s. deviation for all non-H atoms of 0.0115 Å. In the crystal, mol­ecules are connected through N—H...O hydrogen bonds into chains running along [021]. The chains are further connected via C—H...π inter­actions, forming layers in the bc plane.