Halopyridinium cations as bifunctional donors of halogen and hydrogen bonds in salts with benzenesulfonic and p-toluenesulfonic acids

Abstract

A selection of 10 mono- and dihalopyridines have been used as salt coformers for benzenesulfonic and p-toluenesulfonic acids. In most cases, the resultant halopyridinium cations are bifunctional donors of both charge-assisted hydrogen and halogen bonds to the sulfonate anions.