Received 1 March 2013
The asymmetric unit of the title salt, C10H11N2+·C4H5O4-, consists of two independent 5-amino-6-methylquinolin-1-ium cations and two 3-carboxypropanoate anions. Both cations are protonated at the pyridine N atoms and are essentially planar, with maximum deviations of 0.026 (3) and 0.016 (2) Å. In the crystal, the cations and anions are linked via N-HO and O-HO hydrogen bonds, forming a layer parallel to the ab plane. In the layer, weak C-HO hydrogen bonds and - stacking interactions, with centroid-to-centroid distances of 3.7283 (15) and 3.8467 (15) Å, are observed. The crystal structure also features weak C-HO hydrogen bonds between the layers.
For background to and the biological activity of quinoline derivatives, see: Sasaki et al. (1998); Reux et al. (2009); Morimoto et al. (1991); Markees et al. (1970). For related structures, see: Thanigaimani et al. (2013a,b,c); Loh et al. (2010); Sauer et al. (2008). For reference bond-length data, see: Allen et al. (1987). For stability of the temperature controller used for 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: SHELXTL and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: IS5252 ).
The authors thank the Malaysian Government and Universiti Sains Malaysia (USM) for research facilities and a USM Short Term Grant (No. 304/PFIZIK/6312078) to conduct this work. KT thanks the Academy of Sciences for the Developing World and USM for the TWAS-USM fellowship.
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