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In the title compound, C 24 H 17 N 2 O 4+ ·NO 3− ·0.25H 2 O, the central pyridine ring of the 2′,6′-bis­(4-carb­oxy­phen­yl)-4,4′-bipyridin-1-ium cation is almost coplanar with one benzene ring [dihedral angle = 1.03 (5)°], while it makes dihedral angles of 9.59 (5)° with the other benzene ring and 13.66 (6)° with the pyridinium ring. In the crystal, N—H⋯O and O—H⋯O hydrogen bonds link the cations and nitrate anions into a sheet in the (302) plane. The crystal structure also exhibits π–π inter­actions between the central pyridine ring and the benzene rings of neighboring mol­ecules [centroid–centroid distance = 3.6756 (13) Å].

2′,6′-Bis(4-carboxyphenyl)-4,4′-bipyridin-1-ium nitrate 0.25-hydrate