Dual-pH responsive host–guest complexation between a water-soluble pillar[9]arene and a 2,7-diazapyrenium salt?

摘要

The host–guest complexation between a water-soluble pillar[9]arene and a 2,7-diazapyrenium salt not only can be controlled by the sequential addition of an acid and a base (HCl and NaOH, respectively) but also can be switched through the sequential addition of a base and an acid (hexylamine and TFA, respectively).