2-Amino-6-chloropyridinium 3-carboxy-4-hydroxybenzenesulfonate

Abstract

In the 3-carboxy-4-hydroxybenzenesulfonate anion of the title salt, C5H6ClN2 +·C7H5O6S−, an intramolecular O—H...O hydrogen bond with an S(6) ring motif is observed. In the crystal, the anions are linked into a chain structure running along [1\overline{1}0] via an O—H...O hydrogen bond formed between the carboxy and sulfonate groups. The 2-amino-6-chloropyridinium cations bridge the anion chains via N—H...O and C—H...O hydrogen bonds, forming a sheet parallel to the ab plane. In the sheet, a C—H...Cl interaction between the cations is also observed.