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.
Highlights
In the 3-carboxy-4-hydroxybenzenesulfonate anion of the title salt, C5H6ClN2+ÁC7H5O6SÀ, an intramolecular O—HÁ Á ÁO hydrogen bond with an S(6) ring motif is observed
The anions are linked into a chain structure running along [110] via an O—HÁ Á ÁO hydrogen bond formed between the carboxy and sulfonate groups
Some pyridine derivatives possess non-linear optical (NLO) properties (Rajkumar et al, 2015). 2Aminopyridine derivatives are used in the synthesis of pharmaceutical drugs, especially for the treatment of neurological ailments (Schwid et al, 1997)
Summary
Pyridine heterocycles and their derivatives have many applications in the fields of photochemical, electrochemical and catalytic processes (Katritzky et al, 1996). Some pyridine derivatives possess non-linear optical (NLO) properties (Rajkumar et al, 2015). Several crystal structures of 2-aminopyridine co-crystals with carboxylic acid derivatives have been already reported (Hemamalini et al, 2014). As part of our studies in this area, we describe the synthesis and structure of the title salt. In the 2-amino-6-chloropyridinium cation of the title compound, protonation at atom N1 leads to a slight increase in the C1—N1—C5 angle [121.72 (6) compared with 116.8 (1) in unprotonated 2-amino-6-chloropyridine (Hemamalini et al, 2014)].
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