(E)-1-(4-Nitrobenzylidene)-2,2-diphenylhydrazine

The asymmetric unit of the title compound, C19H15N3O2, contains two molecules, both of which show an E conformation of the imine bond. The dihedral angles between the phenyl rings in the phenylhydrazine groups are 86.09 (6) and 83.41 (5)° in the two molecules. The 4-nitrobenzene rings show torsion angles of 4.4 (2) and 10.9 (2)° from the two C=N—N planes. In the crystal, C—H⋯π interactions and C—H⋯O hydrogen bonds are observed growing along the a, b and c axes, resulting in a complex supramolecular array.

The asymmetric unit of the title compound, C 19 H 15 N 3 O 2 , contains two molecules, both of which show an E conformation of the imine bond. The dihedral angles between the phenyl rings in the phenylhydrazine groups are 86.09 (6) and 83.41 (5) in the two molecules. The 4-nitrobenzene rings show torsion angles of 4.4 (2) and 10.9 (2) from the two C N-N planes. In the crystal, C-HÁ Á Á interactions and C-HÁ Á ÁO hydrogen bonds are observed growing along the a, b and c axes, resulting in a complex supramolecular array.  Table 1 Hydrogen-bond geometry (Å , ).
functional groups like NO 2 and Cl, have been studied to have potential antimicrobial agents and were tested for their antibacterial and antifungal activities against (Vicini, et al., 2002 andRollas et al., 2002). In the industry, hydrazones are used as plasticizing agents, polymerization initiators and antioxidants.
In the title compound C 19 H 15 N 3 O 2 , the ASU contains two molecules showing an E configuration on each of the C=N groups with diphenylhydrazine group opposite to p-nitrophenyl ring. The dihedral angle for phenyl rings C8-C13 and C14-C19 is 86.09 (6)° for molecule 1 and that between C27-C32 and C33-C38 rings is 83.41 (5)° for molecule 2.

Experimental
Diphenylhydrazine was dissolved in ethanol (1.2 chemical equivalents), a chemical equivalent of aldehyde which was previously dissolved in the same solvent and it was added drop by drop stirring constantly. The reaction mixture was kept at room temperature and was monitored by TLC, and then vacuum filtered. The hydrazones were recrystallized by a continuous and controlled process until orange crystals with adequate size and purity were developed in order to obtain

Refinement
H atoms bonded to C atoms were placed in geometrical idealized positions and were refined as riding on their parent atoms, with C-H = 0.93-0.98 Å and with U iso (H) = 1.2 U eq (C). (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).

Figure 1
The molecular structure of title compound, with atom labels and 30% probability displacement ellipsoids for non-H atoms.  where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max = 0.001 Δρ max = 0.19 e Å −3 Δρ min = −0.17 e Å −3 Extinction correction: SHELXL97 (Sheldrick, 2008) Extinction coefficient: 0.0160 (12) Special details Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s 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 > 2σ(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.