organic compounds
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In the title hydrated salt, C15H16NO2+·C6H4BrO3S−·H2O, the cation exists in an E conformation with respect to the ethenyl bond and is almost planar, with a dihedral angle of 2.62 (12)° between the planes of the pyridinium and benzene rings. The methoxy substituent deviates slightly from the plane of its attached benzene ring [Cmethyl—O—C—C torsion angle = −11.6 (6)°]. In the crystal, the cations, anion and water molecules are linked together into chains along [010] by O—HO hydrogen bonds and weak C—HO interactions. There is a short BrO contact [3.029 (2) Å]. The crystal structure also features C—Hπ interactions involving the benzene ring of the anion.