8-Iodoquinolinium chloride dihydrate

The title compound, C9H7IN+·Cl ·2H2O, was obtained during the synthesis of 8-iodoquinoline from 8-aminoquinoline using the Sandmeyer reaction. The 8-iodoquinolinium ion is almost planar. Solvent water molecules and chloride ions form a hydrogen-bonded chain along the c axis via O—H...Cl links. The 8-iodoquinolinium ions, which are packed along the c axis with cationic aromatic π–π stacking (centroid–centroid distance = 3.624 ), are linked to the chain via N—H...O hydrogen bonds.