title: 1-[(E)-Anthracen-9-yl-methyl-idene]-2-(2,4-di-nitro-phen-yl)hydrazine.
abstract: In the title Schiff base, C21H14N4O4, the dihedral angle between the two nitro groups and the central benzene ring are 83.6 (5) and 2.6 (6)°. The anthracene ring system and the benzene ring make a dihedral angle of 0.7 (2)°. Intra-molecular N-H⋯O and C-H⋯N hydrogen bonds occur. In the crystal, C-H⋯O hydrogen bonds link the mol-ecules, forming chains along the b-axis direction.
authors.affiliation: Chemistry Department, University of Coimbra, P-3004-530 Coimbra, Portugal.
authors.forename: Joana
authors.initials: J
authors.lastname: de A E Silva
authors.forename: Consuelo
authors.initials: C
authors.lastname: Yuste-Vivas
authors.forename: Abilio J F N
authors.initials: AJ
authors.lastname: Sobral
authors.forename: Manuela Ramos
authors.initials: MR
authors.lastname: Silva