Selective Sodium Halide over Potassium Halide Binding and Extraction by a Heteroditopic Halogen Bonding [2]Catenane

A heteroditopic [2]catenane is a potent ion-pair receptor for alkali metal halides. It preferentially binds sodium halides over potassium halides, which translates to selective extraction of solid sodium halide salts into organic solvents.