Received 15 February 2013
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)°. Intramolecular N-HO and C-HN hydrogen bonds occur. In the crystal, C-HO hydrogen bonds link the molecules, forming chains along the b-axis direction.
For general background to hydrazone derivatives, see: Kahwa et al. (1986). For the structures of 2,4-dinitrophenylhydrazine and 9-anthraldehyde, see: Okabe et al. (1993) and Trotter (1959), respectively.
Data collection: APEX2 (Bruker, 2003); cell refinement: SAINT (Bruker, 2003); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2006); software used to prepare material for publication: WinGX publication routines (Farrugia, 2012).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BT6891 ).
This work was supported by the Fundo Europeu de Desenvolvimento Regional-QREN-Compete through projects SFRH/BD/61637/2009, PTDC/AAC-CLI/098308/2008, PTDC/AAC-CLI/118092/2010, PTDC/FIS/102284/2008 and PEst-C/FIS/UI0036/2011 - Fundação para a Ciência e Tecnologia (FCT).
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