N′-(2-Hydroxy-4-methoxybenzylidene)-3-nitrobenzohydrazide

In the molecule of the title compound, C15H13N3O3, an intramolecular O—H⋯N hydrogen bond influences the planarity of the conformation; the dihedral angle between the benzene rings is 11.4 (3)°. In the crystal, molecules are linked by N—H⋯O hydrogen bonds into chains in [101].

In the molecule of the title compound, C 15 H 13 N 3 O 3 , an intramolecular O-HÁ Á ÁN hydrogen bond influences the planarity of the conformation; the dihedral angle between the benzene rings is 11.4 (3) . In the crystal, molecules are linked by N-HÁ Á ÁO hydrogen bonds into chains in [101].

Related literature
For general background to hydrazones, see: Rasras et al.
In the crystal structure, the molecules are linked through intermolecular N-H···O hydrogen bonds (Table 1)

Refinement
The amino H atom was located in a difference Fourier map and refined with the N-H distance restrained to 0.90 (1) Å and U iso (H) fixed to 0.081 Å 2 . Other H atoms were constrained to ideal geometries and refined as riding, with Csp 2 -H = 0.93 Å, C(methyl)-H = 0.96 Å, and O-H = 0.82 Å; U iso (H) = 1.2U eq (C) and 1.5U eq (O and C methyl ).
Figures Fig. 1. The molecular structure of (I) showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level. Hydrogen atoms are shown as spheres of arbitrary radius and hydrogen bond is drawn as a dashed line.

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2sigma(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.