Received 1 April 2012
The asymmetric unit of the title compound, C6H4ClNO3, contains two independent molecules in which the dihedral angles between the benzene ring and the nitro groups are 2.5 (1) and 8.5 (1)°. Intramolecular O-HO hydrogen bonds involving the hydroxy and nitro substituents result in the formation of S(6) six-membered rings. In the crystal, O-HO, O-HCl and C-HO hydrogen bonds together with ClO contacts [3.238 (3) and 3.207 (3) Å] generate a three-dimensional network.
Data collection: CAD-4 Software (Enraf-Nonius, 1985); cell refinement: CAD-4 Software; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SJ5233 ).
This study was supported financially by the Capital University of Economics and Business (00891162721716) and the Scientific Research Level Project of the Beijing Education Commission Foundation. The author thanks the Center of Testing and Analysis, Beijing University of Science and Technology, for the data collection.
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