Received 24 June 2011
In the structure of the title compound, C5H7N2+·C8H11O4-, the cis anions associate through head-to-tail carboxylic acid-carboxyl O-HO hydrogen bonds [graph set C(7)], forming chains which extend along c and are interlinked through the carboxyl groups, forming cyclic R22(8) associations with the pyridinium and an amine H-atom donor of the cation. Further amine-carboxyl N-HO interactions form enlarged centrosymmetric rings [graph set R44(18)] and extensions down b, giving a three-dimensional structure.
For the structure of racemic cis-cyclohexane,1,2-dicarboxylic acid, see: Benedetti et al. (1970). For the structure of racemic ammonium cis-2-carboxycyclohexane-1-carboxylate, see: Smith & Wermuth (2011) and of brucinium (1R,2S-2-carboxycyclohexane-1-carboxylate dihydrate, see: Smith et al. (2011). For the structure of the adduct of cis-cyclohexane-1,2-dicarboxylic acid with 4,4'-bipyridine, see: Bhogala et al. (2005). For graph-set analysis, see: Etter et al. (1990).
Data collection: CrysAlis PRO (Oxford Diffraction, 2010); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008) within WinGX (Farrugia, 1999); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: PLATON.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WN2440 ).
The authors acknowledge financial support from the Australian Research Council, the Faculty of Science and Technology and the University Library, Queensland University of Technology.
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