(E)-2-[4-(Dimethyl­amino)styr­yl]-1-methyl­quinolinium 4-methoxy­benzene­sulfonate monohydrate

In the title compound, C(20)H(21)N(2) (+)·C(7)H(7)O(4)S(−)·H(2)O, the cation is nearly planar and exists in the E configuration. The cations and anions form individual chains along the b axis and are inter­connected by weak C—H⋯O inter­actions. The 4-methoxy­benzensulfonate anions are linked to water mol­ecules through O—H⋯O hydrogen bonds, forming a three-dimensional network. The crystal structure is further stabilized by a C—H⋯π inter­action involving the methoxy­phenyl ring. The sulfonate anion is also involved in a weak intra­molecular C—H⋯O inter­action which generates an S(5) ring motif.