Acta Cryst. (2012). E68, o108 [ doi:10.1107/S1600536811051646 ]
Abstract: In the title salt, C4H5ClN3+·C4H3O4-, the 2-amino-5-chloropyrimidinium cation is protonated at one of its pyrimidine N atoms. In the roughly planar (r.m.s. deviation = 0.026 Å) hydrogen malate anion, an intramolecular O-H
O hydrogen bond generates an S(7) ring. 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 connected via further N-HO hydrogen bonds and a short C-HO interaction, forming layers lying parallel to the bc plane.
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