Potassium N-bromo-2,4-dichloro-benzene-sulfonamidate sesquihydrate.

The asymmetric unit of the title salt, K(+)·C(6)H(3)BrCl(2)NO(2)S(-)·1.5H(2)O, contains one K(+) cation, one N-bromo-2,4-dichlorobenzenesulfonamidate anion, one water molecule in general position and one water molecule located on a twofold rotation axis. The K(+) cation is hepta-coordinated by three water O atoms and four sulfonyl O atoms from three symmetry-related N-bromo-2,4-dichloro-benzene-sulfonamide anions. The S=N distance of 1.575 (3) Å is consistent with that of a double bond. In the crystal, the anions are linked by O-H⋯Br and O-H⋯N hydrogen bonds into layers parallel to the ac plane.