5-(Thio­phen-2-ylmeth­yl)-1,3,4-thia­diazol-2-amine

In the title mol­ecule, C₇H₇N₃S₂, the dihedral angle between the thio­phene and thia­diazole rings is 72.99 (5)°; the two rings are oriented so that the S atoms in each ring are on the same side. In the crystal, the three-dimensional network involves strong N—H...O hydrogen bonds, as well as C—H...π and π–π stacking inter­actions [centroid–centroid distances = 3.654 (1) and 3.495 (1) Å].

5-Diethyl­amino-2-[(E)-(2,4-dimeth­oxy­phen­yl)imino­meth­yl]phenol

The title Schiff base, C₁₉H₂₄N₂O₃, exists in the crystal structure in the phenol–imine tautomeric form with an intra­molecular O—H...N hydrogen bond. The planes of the aromatic rings form a dihedral angle of 36.8 (8)°. The crystal packing is characterized by C—H...O hydrogen bonds and π–π stacking inter­actions [centroid–centroid distance = 3.478 (4)Å].

4-[2-(4-Hy­droxy­phen­yl)eth­yl]-3-propyl-1H-1,2,4-triazol-5(4H)-one

The asymmetric unit of the title compound, C₁₃H₁₇N₃O₂, contains eight crystallographically independent mol­ecules. The planes of the benzene and triazole rings in the eight mol­ecules make dihedral angles of 5.53 (13), 9.33 (13), 19.28 (11), 17.36 (8), 12.84 (12), 8.03 (8), 19.97 (11), and 7.98 (8)°. The eight mol­ecules in the asymmetric unit are linked by inter­molecular O—H...O and N—H...O hydrogen bonds, forming a three-dimensional network.

(E)-{[But-2-ene-1,4-diylbis(­oxy)]bis­(4,1-phenyl­ene)}bis­(phenyl­methanone)

The title mol­ecule, C₃₀H₂₄O₄, lies about an inversion center located at the mid-point of the central C=C bond. The diphenyl­methanone unit adopts an all-trans conformation. The dihedral angle between the adjacent rings is 53.57 (4)°.

4-Meth­oxy-2-{(E)-[(thio­phen-2-yl)methyl­imino]­meth­yl}phenol

The title Schiff base, C₁₃H₁₃NO₂S, adopts the phenol–imine tautomeric form and reveals an intra­molecular O—H...N hydrogen bond involving the hy­droxy group and the imino N atom, forming an S(6) ring. The mol­ecule is highly twisted with respect to the central imine group, which is reflected in the dihedral angle of 67.83 (10)° formed by the thienyl and phenol rings. The crystal packing is characterized by weak C—H...O and C—H...π inter­actions.

1,1,2,2-Tetra­kis[2,4-dichloro-6-(dieth­oxy­meth­yl)phen­oxy­meth­yl]ethene

In the title compound, C₅₀H₆₀Cl₈O₁₂, the mol­ecules are disordered about an inversion center located at the mid-point of the central C=C bond. These atoms show disorder and were modelled with two different orientations with site occupancies of 0.828 (3) and 0.172 (3). The dihedral angle between the two benzene rings in the asymmetric unit is 52.80 (6)°. Intramolecular C—H...O and C—H...Cl interactions occur and the crystal packing features inversion dimers linked by pairs of C—H...O bonds, generating R₂²(10) loops.

Ethyl 2-[2-(4-hy­droxy-3-meth­oxy­benzyl­idene)hydrazin-1-yl­idene]-3,4-dimethyl-2,3-dihydro-1,3-thia­zole-5-carboxyl­ate

The title compound, C₁₆H₁₉N₃O₄S, is almost planar, with a dihedral angle of 2.88 (9)° between the mean planes of the benzene and thia­zole rings. The mol­ecule adopts an E conformation about the two C=N bonds, with a C—N—N—C torsion angle of −177.01 (11)°. An intra­molecular C—H...O hydrogen bond exists between a thia­zole methyl group and the formic acid ethyl ester carbonyl O atom. In the crystal, mol­ecules are linked by O—-H...O hydrogen bonds, forming chains propagating along [2-10]. The chains are linked via C—H...O hydrogen bonds with R₂²(12) ring motifs, forming sheets lying parallel to (12-2). The sheets are further linked through out-of-plane C—H...N hydrogen bonds with R₂²(12) ring motifs and C—H...π inter­actions, forming an inter­esting three-dimensional supra­molecular architecture.