Received 19 September 2011
In the structure of the title molecular salt, C5H7N2+·C8H11O4-, the cis monoanions associate through short O-HO hydrogen bonds in the carboxylic acid groups [graph set C(7)], forming zigzag chains which extend along the c axis. These are interlinked through pyridinium and amine N-HO hydrogen bonds, giving a three-dimensional network structure.
For the structure of racemic cis-cyclohexane-1,2-dicarboxylic acid, see: Benedetti et al. (1970). For the structure of the racemic ammonium and 2-aminopyridinium salts of cis-2-carboxycyclohexane-1-carboxylate, see: Smith & Wermuth (2011a,b). 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: FJ2453 ).
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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