2-Nitro-p-phenylene dibenzenesulfonate

In the title compound, C18H13NO8S2, the nitrophenyl ring forms dihedral angles of 46.67 (7) and 75.40 (6)° with the phenyl rings. The nitro group makes a dihedral angle of 26.13 (8)° with the attached ring. The crystal packing is stabilized by weak intermolecular C—H⋯O hydrogen bonds.

In the title compound, C 18 H 13 NO 8 S 2 , the nitrophenyl ring forms dihedral angles of 46.67 (7) and 75.40 (6) with the phenyl rings. The nitro group makes a dihedral angle of 26.13 (8) with the attached ring. The crystal packing is stabilized by weak intermolecular C-HÁ Á ÁO hydrogen bonds.
The compound (I) was prepared by the reaction of 2-nitrohydroquinone and 4-phenylsulfonyl chloride in the presence of triethylamine (Ji et al., 2006) and its structure was reported here.

Refinement
All H atoms were positioned geometrically and refined as riding (C-H = 0.95Å for aromatic H) and allowed to ride on their parent atoms, with U iso (H) =1.2U eq (parent). Fig. 1. The molecular structure of the title compound, (I), with displacement ellipsoids drawn at 30% probability level.

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds supplementary materials sup-3 in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.