organic compounds
Open access
In the dication of the title salt, C16H21ClN2O2+·2C6H2N3O7− [systematic name: 2-{(4-chlorophenyl)[2-(dimethylazaniumyl)ethoxy]methyl}pyridinium bis(2,4,6-trinitrophenolate), contains a carbinoxaminium dication and two picrate anions, which are held together through intermolecular N—HO hydrogen bonds. In the dication, the two aromatic rings form a dihedral angle of 80.1 (1)°. In the two independent picrate anions, the nitro groups are twisted from the benzene plane, the largest dihedral angle in each ion being 42.8 (1) and 81.1 (5)°. In the crystal, in addition to the classical N—HO hydrogen bonds, weak C—HO hydrogen bonds and π–π interactions between the aromatic rings of the anions [centroid–centroid distances of 3.5768 (15) and 3.7436 (15) Å] help to establish the packing.
organic compounds
Open access
The title compound, C15H13N3O3, exists in the E conformation with respect to the azomethane C=N double bond. The pyridyl and phenyl rings form dihedral angles of 35.67 (8) and 36.65 (7)°, respectively with the central C(=O)N2C unit. In the crystal, N—HO and C—HO hydrogen bonds connect the molecules into chains along the b axis. Another C—HO interaction connects molecules along the c-axis direction, forming layers.