2-Fluoro-N′-(2-methoxybenzylidene)benzohydrazide

The molecule of the title compound, C15H13FN2O2, exists in a trans configuration with respect to the methylidene unit. The two benzene rings form a dihedral angle of of 64.7 (2)°. In the crystal, molecules are linked through N—H⋯O hydrogen bonds into chains propagating along the c axis.

The molecule of the title compound, C 15 H 13 FN 2 O 2 , exists in a trans configuration with respect to the methylidene unit. The two benzene rings form a dihedral angle of of 64.7 (2) . In the crystal, molecules are linked through N-HÁ Á ÁO hydrogen bonds into chains propagating along the c axis.

Comment
As a contribution to a structural study of hydrazone compounds (Han & Zhao, 2010;Zhou & Yang, 2010;Huang & Wu, 2010;Shalash et al., 2010), we present here the crystal structure of the title compound.
The molecule of the title compound exists in a trans configuration with respect to the methylidene unit (Fig. 1). The molecule is twisted, with the dihedral angle between the two benzene rings of 64.7 (2)°. The torsion angle C7-N1-N2-C8 is 8.6 (2)°. The bond lengths are within normal ranges (Allen et al., 1987) and are comparable with those observed in the similar compound (Xu et al., 2011).
In the crystal structure, molecules are linked through intermolecular N-H···O hydrogen bonds (Table 1)

Refinement
All H atoms were placed in geometrically idealized positions, with C-H = 0.93-0.96 Å, N-H = 0.86 Å, and refined as riding, with U iso (H) = 1.2U eq (C,N) and 1.5U eq (C15). Fig. 1. The molecular structure of the title compound, with displacement ellipsoids drawn at the 30% probability level.

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 supplementary materials sup-3 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.