Benzene-1,3-dicarb-oxy-lic acid-1,2-bis-(4-pyrid-yl)ethene (1/1).

In the title compound, C(12)H(10)N(2)·C(8)H(6)O(4), the asymmetric unit contains two halves of 1,2-bis-(4-pyrid-yl)ethene (bpe) mol-ecules and one benzene-1,3-dicarb-oxy-lic acid (1,3-H(2)BDC) mol-ecule. These bpe and 1,3-H(2)BDC mol-ecules are linked by classical O-H⋯N hydrogen bonds, forming an extended one-dimensional zigzag chain. Each chain is further linked with neighboring ones by π-π inter-actions between the pyridine and aromatic rings [centroid-centroid distances = 3.9306 (15) Å] and the pyridine rings of pairs of symmetry-related mol-ecules [centroid-centroid distances = 3.5751 (15), 3.7350 (15) and 3.6882 (15) Å], with the formation of a three-dimensional supra-molecular framework.