Acta Cryst. (2008). E64, o1045-o1046  [ doi:10.1107/S1600536808013263 ]

Propane-1,2-diammonium bis(6-carboxypyridine-2-carboxylate) dihydrate

H. Aghabozorg, M. Heidari, M. Ghadermazi and J. Attar Gharamaleki

Abstract: The reaction of propane-1,2-diamine (pn) and pyridine-2,6-dicarboxylic acid (pydcH₂) in a 1:2 molar ratio in aqueous solution resulted in the formation of the title compound, C₃H₁₂N₂²⁺·2C₇H₄NO₄·2H₂O or (pnH₂)(pydcH)₂·2H₂O. The structure contains two monoanionic deprotonated forms of pyridine-2,6-dicarboxylic acid molecules (pydcH)^-, a diprotonated propane-1,2-diamine (pnH₂)²⁺, and two water molecules. A significant - stacking interaction is observed between the pyridyl rings of the (pydcH)^- fragments, with a face-to-face distance of 3.6194 (9) Å. In the crystal structure, a wide range of non-covalent interactions consisting of ion pairing, hydrogen bonding [of the types of O-HO, N-HO, N-HN and C-HO, with DA distances in the range 2.454 (2)-3.222 (2)Å] and - stacking interactions [centroid-centroid distance = 3.6194 (9) Å] connect the components into a supramolecular structure.

Online 10 May 2008

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