2-[(E)-4-(Dimethyl­amino)­styr­yl]-1-methyl­pyridinium 4-chloro­benzene­sulfonate monohydrate

In the title hydrated mol­ecular salt, C(16)H(19)N(2) (+)·C(6)H(4)ClO(3)S(−)·H(2)O, the 2-[4-(dimethyl­amino)­styr­yl]-1-methyl­pyridinium cation exists in an E configuration with respect to the C=C bond and is slightly twisted, with the dihedral angle between the pyridinium and benzene rings being 9.33 (10)°. In the crystal structure, the packing is stabilized by O—H⋯O hydrogen bonds and weak C—H⋯O inter­actions, which link the cations, anions and water mol­ecules into chains propagating in [010]. These chains are stacked along the a axis by π–π inter­actions, with centroid-to-centroid distances of 3.6429 (12) and 3.6879 (12) Å; weak C—H⋯π inter­actions are also observed.