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In the title compound, K+·C6H4BrN2O4S·H2O, the K+ ion is hepta-coordinated by two O atoms from two different water mol­ecules, three sulfonyl O atoms from three N-bromo-2-nitro-benzene­sulfonamidate anions and two nitro O atoms from two N-bromo-2-nitro-benzene­sulfonamidate anions. The S—N distance of 1.576 (4) Å is consistent with an S=N double bond. The crystal structure is stabilized by inter­molecular O—H...N and O—H...Br hydrogen bonds which link the molecules into polymeric layers running parallel to the bc plane.

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The asymmetric unit of the title salt, K+·C6H3BrCl2NO2S·1.5H2O, 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-dichloro­benzene­sulfonamide 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.
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