The title compound, C14H11N5O6, was obtained from the condensation reaction of 2,4-dinitrophenylhydrazine and 2-nitroacetophenone. The molecule displays an E conformation about the C=N double bond and an intramolecular N—H⋯O hydrogen bond generates an S(6) ring motif. The dihedral angle between the benzene rings is 7.84 (6)°. In the crystal, molecules are linked by C—H⋯O hydrogen bonds and π–π stacking interactions [centroid–centroid distance = 3.6447 (8) Å] into a three-dimensional network.
The molecule of the title compound, C15H14N4O5, is in an E conformation with respect to the C=N double bond and the dihedral angle between the two benzene rings is 37.83 (7)°. The ethylidenehydrazine plane makes dihedral angles of 4.93 (9) and 42.38 (9)° with the two benzene rings. An intramolecular N—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, molecules are linked by weak C—H⋯O interactions into chains along the c axis which are stacked along the b axis by aromatic π–π interactions with a centroid–centroid distance of 3.5927 (10) Å.
The title molecule, C20H24N2O6, lies on an inversion centre. All non-H atoms are essentially coplanar, with an r.m.s. deviation of 0.0415 (1) Å and a maximum deviation of 0.1476 (1) Å for the methoxy C atom at the 4-position of the benzene ring. The crystal structure is stabilized by weak C—H⋯N and C—H⋯π interactions.
In the title compound, C16H19N2
+·C6H4BrO3S−, the cation is nearly planar, with a dihedral angle of 3.19 (15)° between the pyridinium and the dimethylaminophenyl rings, and exists in the trans configuration. In the crystal packing, the cations and anions are linked into chains parallel to the c axis. These chains are stacked along the b axis. The crystal is stabilized by weak C—H⋯O and C—H⋯π interactions, and a π–π interaction is also observed with a Cg⋯Cg distance of 3.5675 (19) Å.
There are two crystallographically independent molecules in the asymmetric unit of the title compound, C18H20N2O2. The two molecules exist in an E,E configuration with respect to the two C=N double bonds. The dihedral angles between the two benzene rings in each molecule are 16.89 (6) and 18.84 (6)°. In each molecule, the two methoxy groups are coplanar with their attached benzene rings, with r.m.s. deviations of 0.0078 and 0.0336 Å in one molecule, and 0.0163 and 0.0207 Å in the other. An intramolecular C—H⋯O hydrogen bond is present in one molecule. In the crystal structure, molecules are arranged into ribbons along the c axis. These ribbons are further stacked along the a axis. The molecules are consolidated by C⋯N [3.306 (2)–3.427 (2) Å] and C⋯O [3.3284 (16)–3.3863 (15) Å] short contacts. C—H⋯π interactions are also observed.
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