Acta Cryst. (2013). E69, o319-o320 [ doi:10.1107/S1600536813002547 ]
Abstract: The asymmetric unit of the title compound, 2C10H11N2+·2C3H3O4-·C3H4O4, consists of one 5-amino-6-methylquinolin-1-ium cation, one hydrogen malonate (2-carboxyacetate) anion and one-half molecule of malonic acid which lies on a twofold rotation axis. The quinoline ring system is essentially planar, with a maximum deviation of 0.062 (2) Å for all non-H atoms. In the anion, an intramolecular O-HO hydrogen bond generates an S(6) ring. In the crystal, the components are linked via N-HO and O-HO hydrogen bonds into layers parallel to the ac plane. The crystal structure also features weak C-HO hydrogen bonds and a - stacking interaction with a centroid-centroid distance of 3.8189 (10) Å.
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