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The title compound, (C13H11N2)2[Ni(C7H3NO4)2]·3H2O, consists of a mononuclear anionic complex, two 9-amino­acridinium cations and three uncoordinated water mol­ecules. Two pyridine-2,6-dicarboxyl­ate (pydc) ligands are bound to the NiII ion, giving an NiN2O4 bonded set. The coordination geometry around the NiII atom is distorted octa­hedral. There are two types of robust O—H...O hydrogen-bond synthons, namely R66(24) and R24(8), which link the complex anions and water mol­ecules to each other. N—H...O hydrogen bonds connect the stacks of anions and cations in the structure. Other inter­molecular inter­actions, including weak C—H...O hydrogen bonds, π–π [shortest centroid–centroid distance = 3.336 (7) Å] and C—O...π [O...centroid distance = 3.562 (10) Å] inter­actions, connect the various components.
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