(E)-2-[ 4-(Diethylamino) styryl]-1-methylquinolin-1-ium 4-chlorobenzenesulfonate monohydrate

The asymmetric unit of the title hydrated salt, C22H25N2+center dot-C6H4ClO3S(-)center dot H2O, comprises two 2-[4-(diethylamino) styryl]-1-methylquinolin-1-ium cations, two 4-chlorobenzenesulfonate anions and two solvent water molecules. One ethyl group of both cations displays disorder over two positions in a 0.659 (2): 0.341 (2) ratio in one molecule and in a 0.501 (2): 0.499 (2) ratio in the other. The sulfonate group of one anion is also disordered over two positions in a 0.893 (7): 0.107 (7) ratio. The dihedral angle between the mean plane of the quinolinium ring system and that of benzene ring is 10.57 (18)degrees in one cation and 14.4 (2)degrees in the other. In the crystal, cations, anions and water molecules are linked into chains along the [010] direction by O-H center dot center dot center dot O-sulfonate hydrogen bonds, together with weak C-H center dot center dot center dot O-sulfonate and C-H center dot center dot center dot Cl interactions. The cations are stacked by pi-pi interactions, with centroid-centroid distances in the range 3.675 (2)-4.162 (3) angstrom.