N′-(4-Bromobenzylidene)thiophene-2-carbohydrazide

In the title compound, C12H9BrN2OS, the dihedral angle between the aromatic rings is 10.0 (2)°. In the crystal structure, inversion dimers linked by pairs of N—H⋯O hydrogen bonds occur, generating R 2 2(8) loops. Weak aromatic π–π stacking [centroid–centroid separations = 3.825 (3) and 3.866 (3) Å] also occurs.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB5368).
synthesized the title compound (I), and describe its structure here.

Refinement
H atoms were fixed geometrically and allowed to ride on their attached atoms, with C-H distances = 0.93-0.97 Å; N-H = 0.86Å and with U iso (H) = 1.2U eq (C,N) or 1.5U eq (C methyl ). Fig. 1. The molecular structure of (I) showing 30% probability displacement ellipsoids.

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 > σ(F 2 ) is used only for calculating Rfactors(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.