Received 20 September 2012
In the title hydroxamic acid derivate, C21H14N2O5Cl2, the nitro-substituted benzene ring forms dihedral angles of 66.0 (2) and 59.6 (2)°, with the p-chloro and o-chloro-substituted benzene rings, respectively. The dihedral angle between the two chloro-substituted benzene rings is 64.2 (2) Å. In the crystal, weak C-HO hydrogen bonds link the molecules along . The crystal studied was an inversion twin with refined components in the ratio 0.60 (7):0.40 (7).
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH5536 ).
This work was supported by the Natural Science Fund Projects of Gansu Province (0710RJZA124).
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