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).
![Graphical abstract: Dual-pH responsive host–guest complexation between a water-soluble pillar[9]arene and a 2,7-diazapyrenium salt](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C6QO00579A&imageInfo.ImageIdentifier.Year=2017)
Z. Li, G. Yu and J. Yang, Org. Chem. Front., 2017, 4, 115 DOI: 10.1039/C6QO00579A
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