| Summary: | The asymmetric unit of the title compound, C12H14N22+·2C7H5O5−·1.5H2O, contains two 4,4′-ethylenedipyridinium cations, four gallate anions and three water molecules. In the 4,4′-ethylenedipyridinium cations, the dihedral angles between the pyridinium rings are 4.3 (3) and 18.6 (3)°. Extensive classical N—H...O and O—H...O hydrogen bonding and weak C—H...O hydrogen bonding and C—H...π interactions are present in the crystal structure. π–π stacking is also observed, the centroid–centroid separations between the benzene and pyridine rings being 3.611 (3), 3.448 (3) and 3.536 (3) Å.
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