(E)-N′-(2-Chlorobenzylidene)-2-methoxybenzohydrazide

The molecule of the title compound, C15H13ClN2O2, displays an E configuration about the C=N bond. The dihedral angle between the two benzene rings is 77.1 (2)°. In the crystal structure, molecules are linked through intermolecular N—H⋯O hydrogen bonds, forming chains running along the b axis.

Study on the crystal structures of hydrazone derivatives is an interesting topic in structural chemistry. Recently, the crystal structures of a number of hydrazone compounds have been reported (Mohd Lair et al., 2009;Fun et al., 2008;Li & Ban, 2009;Zhu et al., 2009;Yang, 2007;You et al., 2008). As a continuation of our work in this area (Qu et al., 2008;Cao & Lu, 2009a,b;Qu & Cao, 2009;Cao & Wang, 2009), the title new hydrazone compound, derived from the reaction of 2-chlorobenzaldehyde with an equimolar quantity of 2-methoxybenzohydrazide, is reported.
The molecule of the title compound ( Fig. 1) displays an E configuration about the C═N bond. The dihedral angle between the two benzene rings is 77.1 (2)°. In the crystal structure, molecules are linked through intermolecular N-H···O hydrogen bonds (Table 1) to form chains running along the b axis ( Fig. 2).

Refinement
Atom H2 was located in a difference Fourier map and refined isotropically, with the N-H distance restrained to 0.90 (1) Å. The other H atoms were placed in idealized positions and constrained to ride on their parent atoms, with C-H distances of 0.93-0.96 Å, and with U iso (H) set at 1.2U eq (C) or 1.5U eq (methyl C). Fig. 1. The molecular structure of the title compound with 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 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.