(IUCr) Crystallography Journals Online

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Acta Cryst. (2008). E64, o985 [ doi:10.1107/S1600536808011732 ]

4,4'-Bipyridine-butane-1,2,3,4-tetracarboxylic acid (1/1)

M. M. Najafpour, M. Holynska and T. Lis

Abstract: The title compound, C₁₀H₈N₂·C₈H₁₀O₈, is an example of a system with a short OHN hydrogen bond [ON = 2.565 (3) Å]. The crystal structure comprises a 1:1 adduct between 4,4'-bipyridine and butane-1,2,3,4-tetracarboxylic acid, where both components are centrosymmetric. The component molecules are linked through strong OHN hydrogen bonds, forming chains extending approximately along [ $\\overline{3}$ 11]. The chains are interconnected by OHO hydrogen bonds and weak stacking interactions involving the pyridyl rings of the 4,4'-bipyridine molecules [centroid-centroid distance = 3.73 (2) Å and interplanar distance = 3.35 (1) Å]. The H atom of the short OHN hydrogen bond is disordered over two positions with site occupancy factors of ca 0.6 and 0.4. One methylene group is disordered over two positions; the site occupancy factors are ca 0.9 and 0.1.

Online 3 May 2008