4,4'-Bipyridine-terephthalic acid (1/1)

The asymmetric unit of the title compound, C(10)H(8)N(2)·C(8)H(6)O(4), consists of one half-mol-ecule of each moiety, 4,4'-bipyridine (bpy) and terephthalic acid (bdc), both being located on crystallographic inversion centers. They are linked together via strong inter-molecular O-H⋯N hydrogen bonds, forming infinite chains propagating along [1-21]. The chains are further connected through C-H⋯O inter-actions giving sheets in (012). The sheets are linked via π-π inter-actions between the bpy rings and the bdc-bpy rings [centroid-centroid distances = 3.690 (2) and 3.869 (2) Å], resulting in the formation of a three-dimensional supra-molecular layer-like structure.