4-Aminopyridinium 4-aminobenzenesulfonate 4-ammoniobenzenesulfonate monohydrate

The asymmetric unit of the title compound, C5H7N2+·C6H6NO3S−·C6H7NO3S·H2O, contains one 4-ammoniobenzenesulfonate zwitterion (+H3NC6H4SO3−), one 4-aminobenzenesulfonate anion (H2NC6H4SO3−), one 4-aminopyridinium cation and two half-molecules of water, each lying on a twofold rotation axis. The various ions and molecules in the structure are linked through N—H...O, N—H...N and N—H...S hydrogen bonds and C—H—π interactions into a three-dimensional framework