Acta Cryst. (2008). E64, o2058  [ doi:10.1107/S1600536808031322 ]

4,4'-Bipyridine-cyanoacetic acid (1/2)

G. Song, E.-J. Hao and W. Li

Abstract: Crystals of the title adduct, C₁₀H₈N₂·2C₃H₃NO₂, were obtained from a methanol/water solution of cyanoacetic acid and 4,4'-bipyridine at room temperature. In the crystal structure, cyanoacetic acid and centrosymmetric 4,4'-bipyridine molecules are linked by O-HN hydrogen bonds to form three-component supramolecular adducts. The acidic H atom is almost midway between the O and N atoms of the cyanoacetic acid and bipyridine molecules, with O-H and N-H distances of 1.19 (3) and 1.39 (3) Å, respectively, so that the H-atom transfer is best regarded as partial. The three-component adducts are further interconnected with neighboring molecules by weak intermolecular C-HO and C-HN hydrogen bonds and by - stacking interactions [centroid-centroid distance = 3.7200 (11) Å] to generate a three-dimensional supramolecular structure.

Online 4 October 2008

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