Sodium N,2-dichlorobenzenesulfonamidate sesquihydrate

In the title compound, Na+·C6H4Cl2NO2S−·1.5H2O, one of the water molecules lies on a twofold axis. There is no interaction between the N atom and the sodium ion. The sodium ion exhibits a pseudo-octahedral coordination defined by three water O atoms and three sulfonyl O atoms from three different anions. The S—N distance of 1.588 (2) Å is consistent with an S=N double bond. The crystal structure is stabilized by O—H⋯N and O—H⋯Cl hydrogen bonds.

In the title compound, Na + ÁC 6 H 4 Cl 2 NO 2 S À Á1.5H 2 O, one of the water molecules lies on a twofold axis. There is no interaction between the N atom and the sodium ion. The sodium ion exhibits a pseudo-octahedral coordination defined by three water O atoms and three sulfonyl O atoms from three different anions. The S-N distance of 1.588 (2) Å is consistent with an S N double bond. The crystal structure is stabilized by O-HÁ Á ÁN and O-HÁ Á ÁCl hydrogen bonds.
KS thanks the University Grants Commission, Government of India, New Delhi, for the award of a research fellowship under its faculty improvement program.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BX2268).
The sodium ion shows pseudo-octahedral coordination defined by three water-O atoms and by three sulfonyl-O atoms derived from three different anions. There is no interaction between the nitrogen and sodium ions. The S-N distance of 1.588 (2)Å is consistent with a S-N double bond and is in agreement with those observed with related N-chloro arylsulfonamides.
The Packing diagram consists of a two-dimensional polymeric layer running parallel to the ac plane (Fig. 2). The molecular packing is stabilized by N-H···O and O-H···Cl hydrogen bonds (Table 1)

Experimental
The title compound was prepared according to the literature method (Gowda et al., 2005;2007). The purity of the compound was checked by determining its melting point. It was characterized by recording its infrared and NMR spectra. Single crystals of the title compound used in X-ray diffraction studies were obtained from a slow evaporation of its chloroform solution at room temperature.

Refinement
The O-bound H atoms were located in difference map and later restrained to O-H = 0.82 (2) Å. The other H atoms were positioned with idealized geometry using a riding model with C-H = 0.93 Å. All H atoms were refined with isotropic displacement parameters (set to 1.2 times of the U eq of the parent atom).   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 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.