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In the title compound, 3C 10 H 8 N 2 ·4C 7 H 5 NO 4 , the asymmetric unit contains two mol­ecules of pyridine-3,5-dicarb­oxy­lic acid and one mol­ecule of 4,4′-bipyridine in general positions together with one mol­ecule of 4,4′-bipyridine lying across a centre of inversion, thus giving a 4:3 molar ratio of pyridine-3,5-dicarb­oxy­lic acid to 4,4′-bipyridine. The dihedral angle between the bipyridine rings on general positions is 21.2 (2)°. These mol­ecular units are linked by O—H⋯N hydrogen bonds forming an extended two-dimensional framework in the crystal.

4,4′-Bipyridine–pyridine-3,5-dicarboxylic acid (3/4)