4-(4-Aminophenylsulfonyl)anilinium toluene-4-sulfonate

Abstract

In the title p-toluenesulfonate salt of the drug dapsone, C12H13N2O2S+·C7H7O3S−, the dihedral angle between the two aromatic rings of the dapsone monocation is 70.19 (17)° and those between these rings and that of the p-toluenesulfonate anion are 72.34 (17) and 46.43 (17)°. All amine and aminium H atoms are involved in intermolecular N—H...O hydrogen-bonding associations with sulfonyl O-atom acceptors as well as one of the sulfone O atoms, giving a three-dimensional structure.