Experimental

R factor = 0.038; wR factor = 0.100; data-to-parameter ratio = 14.8. The asymmetric unit of the title compound, C19H15N3O2, contains two molecules, both of which show an E conforma-tion of the imine bond. The dihedral angles between the phenyl rings in the phenylhydrazine groups are 86.09 (6) and 83.41 (5) in the two molecules. The 4-nitrobenzene rings show torsion angles of 4.4 (2) and 10.9 (2) from the two C N—N planes. In the crystal, C—H interactions and C—H O hydrogen bonds are observed growing along the a, b and c axes, resulting in a complex supramolecular array. Related literature For applications of hydrazones, see: Angell et al. (2006); Vicini et al. (2002); Rollas et al. (2002)