1-Methyl-2-[(E)-2,4,5-trimethoxystyryl]-pyridinium benzenesulfonate monohydrate

Abstract

The asymmetric unit of the title compound, C 17H 20NO 3+·C 6H 5O 3S -·H 2O,comprises two 1-methyl-2-[(E)-2,4,5-trimeth-oxy-styr-yl]pyridinium cations, two benzene-sulfonate anions and two water mol-ecules. 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.