A hybrid cavitand-resorcin[4]arene receptor capable of displaying pH-modulated binding affinity toward trimethylalkylammonium ions is proposed as an alternative to the low selectivity exhibited by other receptors used in supramolecular fluorescent sensor systems for choline.
![Hybrid cavitad-resorcin[4]arene for the selective binding of choline and related compounds in protic media](https://www.iciq.org/wp-content/uploads/2014/03/Hybrid-cavitad-resorcin4aren_eng_noticies_articles_2006_29.gif)