4,4'-(Ethane-1,2-diyl)dipyridinium bis-(2-hy-droxy-benzoate).

In the crystal structure of the title compound, C(12)H(14)N(2) (2+)·2C(7)H(5)O(3) (-), the cations and anions are linked via N-H⋯O hydrogen bonds and weak inter-molecular C-H⋯O inter-actions also occur. π-π stacking is observed between the nearly parallel benzene and pyridine rings [dihedral angle = 6.03 (8)°], the centroid-centroid separation being 3.7546 (16) Å. The 4,4'-(ethane-1,2-diyl)dipyridinium cation is centrosymmetric and the mid-point of the ethyl-ene C-C bond is located on an inversion center. An intra-molecular O-H⋯O hydrogen bond occurs in the anion.