N′-(3-Hydroxybenzylidene)-4-nitrobenzohydrazide

The title molecule, C14H11N3O4, is approximately planar, with an interplanar angle between the two benzene rings of 5.8 (2)degrees. In the crystal, four molecules are linked by an R-4(4)(12) motif with pairs of strong O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds. The motif is situated about the crystallographic centres of symmetry and it is composed of two pairs of parallel molecules. This quadruplet of molecules is further extended by symmetry-equivalent hydrogen bonds to form layers parallel to the (10 (1) over bar) plane. In addition to the hydrogen bonds, there is also a weak pi-pi interaction between the benzene rings.