organic compounds
Open access
The asymmetric unit of the title compound, C11H12N2O·C25H28N4O2, contains two different molecules. The smaller is known as antipyrine [systematic name: 1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one] and the larger is built up from two antypirine molecules which are connected through a C atom of the pyrazolone ring to a central propanyl part [systematic name: 4,4′-(propane-2,2-diyl)bis[1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one]. Intramolecular C—HO hydrogen bonds occur in the latter molecule. In the crystal, C—HO hydrogen bonds link the molecules into a two-dimensional network parallel to (001).
organic compounds
Open access
The title compound, also known as 7-nitrotropolone, C7H5NO4, exists in the crystalline state as the 2-hydroxy-7-nitrocyclohepta-2,4,6-trien-1-one tautomer and not as 2-hydroxy-3-nitrocyclohepta-2,4,6-trien-1-one. The dihedral angle between the ring and the nitro group is 70.3 (2)°. In the crystal, neighbouring molecules are linked into dimers by a pair of O—HO hydrogen bonds. In addition, the crystal is stabilized by Oπ [3.4039 (14) Å] and OO [3.073 (2) Å] interactions.