| Summary: | In the structure of the title compound, C10H10N22+·2ClO4−·4C7H7NO2·2C10H8N2·2H2O, the 4,4′-bipyridinium cation has a crystallographically imposed centre of symmetry. The cation is linked by N—H...N hydrogen bonds to adjacent 4,4′-bipyridine molecules, which in turn interact via O—H...N hydrogen bonds with 4-aminobenzoic acid molecules, forming chains running parallel to [30overline{2}]. The chains are further connected into a three-dimensional network by N—H...O and O—H...O hydrogen-bonding interactions involving the perchlorate anion, the water molecules and the 4-aminobenzoic acid molecules. In addition, π–π stacking interactions with centroid–centroid distances ranging from 3.663 (6) to 3.695 (6) Å are present. The O atoms of the perchlorate anion are disordered over two sets of positions, with refined site occupancies of 0.724 (9) and 0.276 (9).
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