Received 11 December 2012
The title compound, C12H7N5O8, was previously described in space group P21/n with Z = 4 [Wu et al. (2007). Acta Cryst. E63, o4194]. The current monoclinic P21/c polymorph was obtained from a mixed solution of dichloromethane and hexane. The dihedral angle between the benzene rings is 44.16 (5)°, smaller than in the previously reported polymorph [56.3 (2)°]. As a result of the steric hinderance of the nitro groups, hydrogen bonding is limited intramolecularly. The dihedral angles between the phenyl rings and their attached nitro groups are 18.97 (6) and 17.71 (5)° at the 2-position, and 18.52 (6) and 32.41 (6)° at the 4-position.
For the preparation of the title compound, see: Elliot & Smith (2000). For general background, see Espinoza & Thornton (1994); Farrell et al. (1985); Chattanathan & Kalidas (1971); Southgate & Hall (1971); Stewart & O'Donnell (1964). For the first monoclinic polymorph, see: Wu et al. (2007).
Data collection: CrystalClear (Rigaku, 2008); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXD (Schneider, et al., 2002); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 2012); software used to prepare material for publication: CrystalStructure (Rigaku, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: FF2093 ).
This work was supported by Research for Promoting Technological Seeds from the Japan Science and Technology Agency (JST).
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