Abstract
In the title compound, C12H8N2O5, the aromatic rings are inclined to one another by 56.14 (7)°. The nitro groups are inclined by to the benzene rings to which they are attached by 3.86 (17) and 9.65 (15)°. In the crystal, molecules are linked by C—H⋯O hydrogen bonds, forming a three-dimensional structure. The title compound is a new monoclinic polymorph, crystallizing in space group P21/c. The first polymorph crystallized in space group C2/c and the molecule possesses twofold rotation symmetry. Two low-temperature structures of this polymorph (150 K and 100 K, respectively) have been reported [Meciarova et al. (2004). Private Communication (refcode IXOGAD). CCDC, Cambridge, England, and Dey & Desiraju (2005). Chem. Commun. pp. 2486–2488].
Highlights
Related literature For the crystal structure of the monoclinic C2/c polymorph of the title compound, see: Meciarova et al (2004); Dey & Desiraju (2005)
The first polymorph crystallized in space group C2/c and the molecule possesses twofold rotation symmetry
The authors are grateful to the Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan, and the Chemistry Department, Loughborough University, Loughborough, UK, for providing laboratory and analytical facilities
Summary
C12H8N2O5, the aromatic rings are inclined to one another by 56.14 (7). The nitro groups are inclined by to the benzene rings to which they are attached by 3.86 (17) and 9.65 (15). Molecules are linked by C—HÁ Á ÁO hydrogen bonds, forming a three-dimensional structure. The title compound is a new monoclinic polymorph, crystallizing in space group P21/c. The first polymorph crystallized in space group C2/c and the molecule possesses twofold rotation symmetry. Two low-temperature structures of this polymorph (150 K and 100 K, respectively) have been reported [Meciarova et al (2004). Related literature For the crystal structure of the monoclinic C2/c polymorph of the title compound, see: Meciarova et al (2004); Dey & Desiraju (2005)
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