organic compounds
Open access
There are two independent molecules, A and B, in the asymmetric unit of the title compound, C19H20N4, in each of which the N=N double bond has an E conformation. The dihedral angles between the pyrazole ring and the p-tolyl rings in the 1- and 4-positions are 22.54 (8) and 35.73 (7)°, respectively, in molecule A. The corresponding dihedral angles in molecule B are 28.13 (8) and 22.18 (8)°. In the crystal, the A and B molecules are linked by weak C—Hπ interactions, leading to inversion dimers in each case.
organic compounds
Open access
There are two independent molecules, A and B, in the asymmetric unit of the title compound, C16H12ClN5O3. The relative orientations of the chlorophenyl ring with respect to the pyrazole ring in the two crystallographically independent molecules are different, and their corresponding dihedral angles are −53.3 (2) and 114.09 (18)° in molecules A and B, respectively. There are two strong intramolecular N—HO hydrogen bonds, and two weak intramolecular C—HO and C—HCl hydrogen bonds. The crystal packing is constructed by weak C—HO and N—HO interactions, and two π–π stacking interactions [centroid–centroid distances = 3.7894 (9) and 3.5719 (10) Å], forming a molecular ladder along the a axis.