Acta Cryst. (2005). E61, o3242-o3244  [ doi:10.1107/S1600536805027431 ]

2,6-Diaminopyridinium pyridinium-2,6-dicarboxylate: a redetermination

H. Aghabozorg, A. Akbari Saei and F. Ramezanipour

Abstract: The crystal structure of the title compound, C₅H₈N₃⁺·C₇H₄NO₄^- or (pydaH)⁺(pydcH)^- (pyda is 2,6-diaminopyridine and pydcH₂ is pyridine-2,6-dicarboxylic acid), shows both intra- and intermolecular proton transfers from carboxyl groups to the ring N atoms of (pydc)^2- and pyda. This determination corrects a previous report which formulated this compound as (pydaH₂)²⁺(pydc)^2- [Moghimi, Ranjbar, Aghabozorg, Jalali, Shamsipur, Yap & Rahbarnoohi (2002), J. Mol. Struct. 605, 133-149]. Ion-pairing, hydrogen-bonding and - stacking interactions link the fragments to form a self-associated system.

Online 14 September 2005

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