title: N-[1-(Biphenyl-4-yl)ethyl-idene]-N'-(2,4-dinitro-phen-yl)hydrazine.
abstract: The title compound, C(20)H(16)N(4)O(4), contains two crystallographically independent mol-ecules (A and B) in the asymmetric unit. Intra-molecular N-H⋯O hydrogen bonds generate S(6) ring motifs in both molecules. The dihedral angles between the nitro-substituted benzene rings and the two benzene rings in mol-ecules A and B are 14.32 (9), 17.89 (9)° and 13.04 (9) and 25.71 (9)°. The ortho and para nitro groups form dihedral angles of 6.2 (2) and 8.5 (2)° in mol-ecule A, and 5.3 (3) and 13.8 (2)° in mol-ecule B, with the benzene rings to which they are attached. The crystal structure is stabilized by inter-molecular C-H⋯O inter-actions.
authors.forename: Reza
authors.initials: R
authors.lastname: Kia
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun
authors.forename: Bijan
authors.initials: B
authors.lastname: Etemadi
authors.forename: Hadi
authors.initials: H
authors.lastname: Kargar