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The title hydrated molecular salt, 2C 12 H 9 N 2+ ·C 14 H 6 O 8 S 22− ·6H 2 O, consists of 1,10-phenanthrolinium (phen-H + ) cations, anthraquinone-1,5-disulfonate (AQDS 2− ) anions, which occupy a centre of inversion, and water molecules of crystal­lization. In the crystal, a supra­molecular network structure is formed  via  N—H⋯O and O—H⋯O hydrogen bonds and weak C—H⋯O and π–π stacking inter­actions [centroid–centroid distances = 3.651 (6) and 3.545 (8) Å].

Bis(1,10-phenanthrolin-1-ium) 9,10-dioxo-9,10-dihydroanthracene-1,5-disulfonate hexahydrate