Acta Cryst. (2010). E66, o2457-o2458 [ doi:10.1107/S1600536810033507 ]
Abstract: In the title hydrated salt, C5H6ClN2+·C4H3O4-·0.25H2O, the water O atom lies on a twofold axis with half occupancy. The 2-amino-5-chloropyridinium cation is almost planar, with a maximum deviation of 0.015 (3) Å. In the hydrogen malate anion, an intramolecular O-HO hydrogen bond generates an S(7) ring and results in a folded conformation. In the crystal, the protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxylate O atoms of the anion via a pair of N-HO hydrogen bonds, forming an R22(8) ring motif. The ion pairs are further connected via O-HO, N-HO and C-HO hydrogen bonds, forming layers parallel to the ab plane which stack down the c axis.
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