Acta Crystallographica Section E

Structure Reports Online

Volume 68, Part 1 (January 2012)


organic compounds



hb6543 scheme

Acta Cryst. (2012). E68, o108    [ doi:10.1107/S1600536811051646 ]

2-Amino-5-chloropyrimidin-1-ium hydrogen maleate

H.-K. Fun, M. Hemamalini and V. Rajakannan

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-H...O hydrogen bonds, forming an R22(8) ring motif. The ion pairs are connected via further N-H...O hydrogen bonds and a short C-H...O interaction, forming layers lying parallel to the bc plane.


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