Ethyl 2-(5-meth­oxy-2-methyl-1H-indol-3-yl)acetate

In the title compound, C₁₄H₁₇NO₃, the nine-membered 1H-indole ring system is essentially planar [maximum deviation = 0.019 (1) Å]. In the crystal, mol­ecules are linked via N—H...O hydrogen bonds, forming chains along [001]. These chains are linked via C—H...O hydrogen bonds and C—H...π inter­actions, forming a two-dimensional network lying parallel to the ac plane.

Ethyl 3-amino-5-anilino-4-cyano­thio­phene-2-carboxyl­ate

In the title compound, C₁₄H₁₃N₃O₂S, the dihedral angle between the thio­phene and phenyl rings is 24.95 (8)°. The mol­ecular structure is consolidated by intra­molecular N—H...O and C—H...S inter­actions. The crystal structure features N—H...N and N—H...O hydrogen bonds forming centrosymmetric R₂²(12) dimers, which are linked into a two-dimensional network parallel to (011) with an S(6)R₂²S(6) motif. In addition, π–π stacking inter­actions [centroid–centroid distance = 3.7013 (12) Å] occur between the thio­phene and phenyl rings of adjacent mol­ecules.

4-Phenyl-1,2,4-tri­aza­spiro­[4.5]dec-1-ene-3-thione

In the title compound, C₁₃H₁₅N₃S, the 4,5-di­hydro-3H-1,2,4-triazole ring is nearly planar [maximum deviation = 0.020 (1) Å], while the cyclo­hexane ring adopts a chair conformation. The dihedral angle between the 4,5-di­hydro-3H-1,2,4-triazole ring and the phenyl ring is 74.68 (7)°. No specific inter­molecular inter­actions are discerned in the crystal packing.

2,2′-[Ethane-1,2-diylbis(­oxy)]dibenz­alde­hyde

In the title compound, C₁₆H₁₄O₄, the benzene rings are inclined at a dihedral angle of 75.14 (9)°. The torsion angle of the bridging O—C—C—O group is −76.50 (11)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming C(6) chains along [100]. Furthermore, C—H...π inter­actions and π–π stacking inter­actions [centroid–centroid distances = 3.6957 (7) and 3.6735 (8) Å] contribute to the stability of the crystal packing.

2-(4-Oxo-3-phenyl-1,3-thia­zolidin-2-yl­idene)propanedi­nitrile

In the title compound, C₁₂H₇N₃OS, the five-membered 1,3-thia­zolidine ring is nearly planar [maximum deviation = 0.032 (2) Å] and makes a dihedral angle of 84.14 (9)° with the phenyl ring. In the crystal, mol­ecules are linked by C—H...N hydrogen bonds into infinite chains along [-101]. C—H...π inter­actions contribute to the arrangement of the mol­ecules into layers parallel to (101).

(1Z,2E)-1-(3,4-Diphenyl-2,3-di­hydro-1,3-thia­zol-2-yl­idene)-2-(1-p-tolyl­ethyl­idene)hydrazine

In the title compound, C₂₄H₂₁N₃S, the thia­zole ring makes dihedral angles of 52.03 (6), 62.63 (6) and 12.35 (6)°, respectively, with the two phenyl rings and the benzene ring. In the crystal, weak C—H...π inter­actions occur between inversion-related mol­ecules.

Methyl (2Z)-((2Z)-2-{(2E)-[1-(4-methyl­phen­yl)ethyl­idene]hydrazinyl­idene}-4-oxo-3-phenyl-1,3-thia­zolidin-5-yl­idene)ethano­ate

The asymmetric unit of the title compound, C₂₁H₁₉N₃O₃S, contains two independent mol­ecules. In one mol­ecule, the 1,3-thia­zolidine ring forms dihedral angles of 86.19 (8) and 8.37 (8)° with the phenyl and benzene rings, respectively. The corresponding dihedral angles in the other mol­ecule are 69.60 (7) and 14.08 (7)°. The dihedral angle between the phenyl and benzene rings is 84.70 (8)° in one mol­ecule and 69.62 (8)° in the other. In the crystal, mol­ecules pack in layers approximately parallel to (10-2). There are weak C—H...O hydrogen bonds within these layers. Further weak C—H...O hydrogen bonding occurs between the layers to form a three-dimensional network. A weak C—H...π inter­action is also observed.

(4E)-4-[(2-Hy­droxy­anilino)methyl­idene]-1-phenyl­pyrazolidine-3,5-dione dimethyl sulfoxide hemisolvate

The asymmetric unit of the title compound, C₁₆H₁₃N₃O₃·0.5C₂H₆OS, is composed of two independent pyrazolidine-3,5-dione mol­ecules and one dimethyl sulfoxide solvent mol­ecule. In each pyrazolidine-3,5-dione mol­ecule, an intra­molecular N—H...O hydrogen bond forms an S(5)S(6) motif. In the crystal, pairs of each independent pyrazolidine-3,5-dione mol­ecule are linked by N—H...O hydrogen bonds, forming dimers with R₂²(8) motifs. These dimers are connected with the other mol­ecules through the solvent mol­ecules via O—H...O hydrogen bonds, forming ribbons along the b-axis direction. C—H...π inter­actions connect the ribbons. C—H...O interactions also occur.

2-(4-Bromo­phen­yl)-1-pentyl-4,5-diphenyl-1H-imidazole

The title compound, C₂₆H₂₅BrN₂, is isomorphous with the chloro derivative [2-(4-chloro­phen­yl)-1-pentyl-4,5-diphenyl-1H-imidazole; Mohamed et al. (2013). Acta Cryst. E69, o846-o847]. The two phenyl rings and the 4-bromo­phenyl ring are oriented at dihedral angles of 30.1 (2), 64.3 (3) and 42.0 (2)°, respectively, with respect to the imidazole ring. In the crystal, mol­ecules stack in columns along the b-axis direction, however, there are no significant inter­molecular inter­actions present.

2-(5-Meth­oxy-2-methyl-1H-indol-3-yl)-N′-[(1E,2E)-3-phenyl­prop-2-en-1-yl­idene]acetohydrazide

The title compound, C₂₁H₂₁N₃O₂, adopts a J-shaped conformation which appears to be at least partially directed by a weak intra­molecular C—H...N hydrogen bond. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds into R₂²(8) and R₂²(14) cyclic dimers, which form a chain running parallel to the b axis.

Amino­[(1H-benzimidazol-2-yl)amino]­methaniminium 4-methyl­benzene­sulfonate

The asymmetric unit of the title salt, C₈H₁₀N₅⁺·C₇H₇O₃S⁻, consists of two amino­[(1H-benzimidazol-2-yl)amino]­meth­an­im­inium cations and two 4-methyl­benzene­sulfonate anions. The cations are each stabilized by intra­molecular N—H...N hydrogen bonds between the free amino groups and the imine N atoms of the benzimidazole units, forming S(6) ring motifs. In the crystal, cations and anions are linked by N—H...O and C—H...O hydrogen bonds, forming a three-dimensional supra­molecular framework. Two strong π–π stacking inter­actions [centroid–centroid distances = 3.4112 (14) and 3.4104 (14) Å] also occur between the centroids of the imidazole rings of like cations.

Methyl 2-((2Z,5Z)-2-{(E)-2-[1-(4-hy­droxy­phen­yl)ethyl­idene]hydrazin-1-yl­idene}-4-oxo-3-phenyl-1,3-thia­zolidin-5-yl­idene)acetate

In the title compound, C₂₀H₁₇N₃O₄S, all non-H atoms, except those of the phenyl ring, are approximately coplanar [maximum deviation = 0.2214 (1) Å], and the dihedral angle between their best plane and the benzene ring is 53.13 (1)°. A short intra­molecular O...S contact of 2.838 (1) Å is formed between the ester carbonyl O atom and the S atom of the thia­zolidine ring. In the crystal, mol­ecules associated via O—H...O, C—H...O and C—H...S hydrogen bonds form layers parallel to (010), with only C—H...O-type short contacts between the mol­ecules in adjacent layers.

12-(2-Hy­droxy-6-oxo­cyclo­hex-1-en­yl)-9,10-di­hydro-8H-benzo[a]xanthen-11(12H)-one

In the xanthenone system of the title compound, C₂₃H₂₀O₄, the pyran ring has a maximum deviation of 0.111 (1) Å from planarity and the outer cyclo­hexene ring exhibits a puckered conformation. The three methyl­ene C atoms of the cyclo­hexene ring bonded to the pyran unit are disordered over two sets of sites [occupancies = 0.570 (3) and 0.430 (3)]. In the crystal, mol­ecules are linked by C—H...O and O—H...O hydrogen bonds, forming a two-dimensional network parallel to (110). A C—H...π inter­action occurs between these networks.

(2E)-4-(4-Bromo­phen­yl)-2-{(2Z)-[1-(4-methyl­phen­yl)ethyl­idene]hydrazinyl­idene}-3-phenyl-2,3-di­hydro-1,3-thia­zole

In the title compound, C₂₄H₂₀BrN₃S, the di­hydro­thia­zole ring is approximately planar, with a maximum deviation of 0.008 (2) Å, and is twisted with respect to the 4-bromo­phenyl ring, the phenyl ring and methyl­phenyl ring, making dihedral angles of 47.96 (8), 59.52 (9) and 16.96 (9)°, respectively. In the crystal, weak C—H...π inter­actions link inversion-related mol­ecules into supra­molecular dimers.

N′-[(E)-Benzyl­idene]-2-(6-meth­oxy­naphthalen-2-yl)propano­hydrazide

The title mol­ecule, C₂₁H₂₀N₂O₂, exists in the solid state in the `extended' form. The crystal packing consists of ribbons of mol­ecules extending parallel to c and associated via N—H...O and weak C—H...O hydrogen bonds. C—H...π inter­actions are also present.

N′-[(E)-4-Meth­oxy­benzyl­idene]-2-(5-meth­oxy-2-methyl-1H-indol-3-yl)acetohydrazide

The conformation adopted by the title compound, C₂₀H₂₁N₃O₃, in the crystal is `J'-shaped and appears to be at least partially directed by a weak intra­molecular C—H...N hydrogen bond. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, forming dimers with R₂²(8) motifs. Furthermore, these dimers connect to each other via C—H...O and N—H...O hydrogen bonds to form a three-dimensional network.

Ethyl 4-anilino-2-methyl-5-oxo-1-phenyl-2,5-di­hydro-1H-pyrrole-2-carboxyl­ate

In the title compound, C₂₀H₂₀N₂O₃, the central 2,5-di­hydro-1H-pyrrole ring [r.m.s. deviation = 0.014 (1) Å] is oriented at dihedral angles of 77.81 (6) and 25.33 (6)°, respectively, to the attached phenyl ring and the aniline phenyl ring. An intra­molecular N—H...O hydrogen bond occurs. In the crystal, mol­ecules are linked through pairs of N—H...O hydrogen bonds, forming inversion dimers with an R₂²(10) ring motif. Two weak C—H...π inter­actions are also observed.

Ethyl 4-(4-chloro­anilino)-1-(4-chloro­phen­yl)-2-methyl-5-oxo-2,5-di­hydro-1H-pyrrole-2-carboxyl­ate

In the title compound, C₂₀H₁₈Cl₂N₂O₃, the dihedral angles between the central 2,5-di­hydro-1H-pyrrole ring and the phenyl rings are 74.87 (9) and 29.09 (9)°. Intra­molecular N—H...O and C—H...O hydrogen bonds occur. In the crystal, pairs of N—H...O hydrogen bonds link adjacent mol­ecules into inversion dimers and form an R₁²(6)R₂²(10)R₁²(6) ring motif through C—H...O hydrogen bonds.

2-(3,4-Di­meth­oxy­phen­yl)-1-pentyl-4,5-diphenyl-1H-imidazole

The central imidazole ring in the title compound, C₂₈H₃₀N₂O₂, makes dihedral angles of 28.42 (13), 71.22 (15) and 29.50 (14)°, respectively, with the phenyl rings in the 4- and 5-positions and the 3,4-di­meth­oxy­phenyl group. In the crystal, mol­ecules are linked by C—H...O and C—H...N hydrogen bonds, weak π–π stacking inter­actions [centroid–centroid distance = 3.760 (2) Å] and C—H...π contacts, forming a three-dimensional network.

Dimethyl (2Z)-2-[4-((1Z)-1-{2-[(2Z,5Z)-5-(2-meth­oxy-2-oxo­ethyl­idene)-4-oxo-3-phenyl-1,3-thia­zolidin-2-yl­idene]hydra­zin-1-yl­idene}eth­yl)anilino]but-2-ene­dio­ate

The mol­ecule of the title compound, C₂₆H₂₄N₄O₇S, adopts a trans conformation about the central N—N bond, presumably to minimize steric between the substituents on these two atoms. An intra­molecular N—H...O hydrogen bond occurs. The phenyl ring is disordered over two sets of sites, with an occupancy ratio of 0.624 (8):0.376 (8). The azolidine ring is essentially planar [maximum deviation = 0.008 (5) Å] and makes a dihedral angle of 4.3 (2)° with the benzene ring and dihedral angles of 74.1 (3) and 69.1 (5)°, respectively, with the mean planes of the major and minor components of the disordered phenyl ring. The packing in the crystal is aided by the formation of several weak C—H...O and C—H...N inter­actions.

2,2′-[(1,3,4-Thia­diazole-2,5-di­yl)bis­(sulfanedi­yl)]diaceto­nitrile

In the title compound, C₆H₄N₄S₃, the 1,3,4-thia­diazole ring is essentially planar, with an r.m.s. deviation of 0.001 Å. The two N—C—S—C torsion angles in the mol­ecule are −23.41 (15) and 0.62 (14)°. One aceto­nitrile group is above the plane of the 1,3,4-thia­diazole ring and the other is below it, indicating syn and anti orientations. In the crystal, C—H...N hydrogen bonds link the molecules into ribbons along [010].