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The asymmetric unit of the ionic title compound, (C6H7N2O)[Bi(C7H3NO4)2(H2O)2]·H2O or (acpyH)[Bi(pydc)2(H2O)2]·H2O, contains an [Bi(pydc)2(H2O)2] anion (where pydcH2 is pyridine-2,6-dicarb­oxy­lic acid), a protonated 3-(amino­carbon­yl)pyridine as counter-ion, (acpyH)+, and one uncoordinated water mol­ecule. The anion is an eight-coordinate complex with a square-anti­prismatic geometry around the BiIII atom. In the crystal, extensive O—H...O and N—H...O hydrogen bonds, as well as ion pairing, C=O...π inter­actions [O...centroid distance = 3.583 (5) Å], π–π stacking [centroid–centroid distance = 3.864 (3) Å], and C—H...π and C—H...O inter­actions, play an important role in the formation and stabilization of the three-dimensional supra­molecular structure.
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