M. Hemamalini, H. Fun
Jul 31, 2010
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Journal
Acta Crystallographica Section E: Structure Reports Online
Abstract
The asymmetric unit of the title salt, C6H9N2 +·C7H5O6S−, contains two crystallographically independent 2-amino-5-methylpyridinium cations and two sulfosalicylate anions. In the crystal structure, the sulfonate group of each 3-carboxy-4-hydroxybenzenesulfonate anion interacts with the corresponding 2-amino-5-methylpyridinium cation via a pair of N—H⋯O hydrogen bonds, forming an R 2 2(8) ring motif. The ionic units are linked by N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds. Furthermore, the crystal structure is stabilized by π–π interactions between the benzene and pyridine rings [centroid–centroid distances = 3.5579 (8) and 3.8309 (8) Å]. There are also intramolecular O—H⋯O hydrogen bonds in the anions, which generate S(6) ring motifs.