4-[(E)-2-(2-Chloro­benzyl­idene)hydrazin-1-yl]quinolin-1-ium chloride dihydrate

In the title hydrated salt, C₁₆H₁₃ClN₃⁺·Cl⁻·2H₂O, a small twist is evident in the cation so that the chloro­benzene ring is not coplanar with the central hydrazinyl group [the N—C—C—C torsion angle = −4.8 (12)°]. The conformation about the imine N=C bond [1.284 (10) Å] is E. The components of the structure are connected into a three-dimensional architecture via O—H...O, O—H...Cl and N—H...Cl hydrogen bonds. One water H atom is disposed over two sites of equal occupancy.