Abstract
The asymmetric unit of the title compound, C17H20NO3 +·C6H5O3S−·H2O, comprises two 1-methyl-2-[(E)-2,4,5-trimethoxystyryl]pyridinium cations, two benzenesulfonate anions and two water molecules. The cations exist in the E conformation with respect to the C=C bond; one cation is essentially planar while the other is slightly twisted, the dihedral angles between the pyridinium and phenyl rings being 1.23 (14) and 6.64 (13)°, respectively. In the crystal, cations, anions and water molecules are linked by O—H⋯O hydrogen bonds and weak C—H⋯O interactions into chains along the b axis. π–π interactions with centroid–centroid distances in the range 3.5557 (16)–3.6876 (16) Å are observed. C—H⋯π interactions and a C⋯O short contact [2.94 (4) Å] are also observed.
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