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In the crystal structure of the title hydrated quinolinium salt of ferron (8-hy­droxy-7-iodo­quinoline-5-sulfonic acid), C 9 H 7 N + ·C 9 H 5 INO 4 S − ·0.8H 2 O, the quinolinium cation is fully disordered over two sites (occupancy factors fixed at 0.63 and 0.37) lying essentially within a common plane and with the ferron anions forming π–π-associated stacks down the  b  axis [minimum ring centroid separation = 3.462 (6) Å]. The cations and anions are linked into chains extending along  c  through hy­droxy O—H⋯O and quinolinium N—H⋯O hydrogen bonds to sulfonate O-atom acceptors which are also involved in water O—H⋯O hydrogen-bonding inter­actions along  b , giving a two-dimensional network.

Quinolinium 8-hydroxy-7-iodoquinoline-5-sulfonate 0.8-hydrate