Received 5 December 2011
In the title molecular salt-adduct, C5H8N3+·C6H7O2-·C6H8O2, the 2,3-diaminopyridinium cation is essentially planar, with a maximum deviation of 0.013 (2) Å, and is protanated at its pyridine N atom. The sorbate anion and sorbic acid molecules exist in extended conformations. In the crystal, the protonated N atom and one of the two amino-group H atoms are hydrogen bonded to the sorbate anion through a pair of N-HO hydrogen bonds, forming an R12(6) ring motif. The carboxyl groups of the sorbic acid molecules and the carboxylate groups of the sorbate anions are connected via O-HO hydrogen bonds. Furthermore, the ion pairs and neutral molecules are connected via intermolecular N-HO hydrogen bonds, forming sheets lying parallel to (100).
For a different crystal structure arising from the same synthesis conditions, see: Hemamalini & Fun (2010). For background to aminopyridines, see: Peng et al. (2001); Leung et al. (2002); Banerjee & Murugavel (2004); Lautie & Belabbes (1996). For hydrogen-bond motifs, see: Bernstein et al. (1995). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986).
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTLand PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB6558 ).
MH, JHG and HKF thank the Malaysian Government and Universiti Sains Malaysia for the Research University grant No. 1001/PFIZIK/811160. MH also thanks Universiti Sains Malaysia for a post-doctoral research fellowship.
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