1.D.111. The Pore-forming Calixarene (CX6) Family
Calixarene (CX6) forms an efficient ion transmembrane channel, which can be blocked by methylene blue (MB) through host-guest interactions. The blocked CX6 channel could be reopened by addition of 4-sulfonated calixarene, owing to its stronger affinity with MB, thereby achieving a reversible ON-OFF-ON type switch (Hu et al. 2019).