2-{(E)-1-[2-(4-Nitrophenyl)hydrazin-1-ylidene]ethyl}benzene-1,3-diol

Abstract

The title compound, C14H13N3O4, is close to planar, the dihedral angle between the terminal benzene rings being 5.80 (16)°; the nitro group is coplanar with the benzene ring to which it is bonded [O—N—C—C torsion angle = −177.3 (3)°]. The hydroxy group forms an intramolecular hydrogen bond with the imine N atom, and the conformation about the imine bond is E. In the crystal, layers in the (101) plane with an undulating topology are formed by O—H...O and N—H...O hydrogen bonds along with C—H...O interactions. Centrosymmetrically related layers are connected via π–π interactions [ring centroid–centroid distance = 3.5739 (19) Å] into double layers.