(4Z)-4-[(2E)-1-Hydroxy-3-(3-nitrophenyl)prop-2-en-1-ylidene]-3-methyl-1-(4-methylphenyl)-1H-pyrazol-5(4H)-one

Abstract

In the title compound, C20H17N3O4, the dihedral angles between the heterocyclic ring and the toluene and nitrobenzene rings are 4.21 (15) and 11.43 (14)°, respectively. The whole molecule is close to planar (r.m.s. deviation for the 27 non-H atoms = 0.171 Å). Two S(6) rings are formed due to intramolecular C—H...O and O—H...O hydrogen bonds. In the crystal, inversion dimers linked by pairs of C—H...O bonds generate R22(10) loops and further C—H...O bonds link the dimers along the b-axis direction. There exist π–π interactions between the heterocyclic rings at a centroid–centroid distance of 3.7126 (10) Å and between the centroids of the benzene rings at a distance of 3.8710 (16) Å.