Squaramide-based receptors in anion supramolecular chemistry: insights into anion binding, sensing, transport and extraction.

Over the last 15 years, squaramide-based receptors have attracted the attention of supramolecular chemists working in the field of anion recognition. Herein, we highlight examples of squaramide-based receptors that are able to bind, sense, extract and transport anions.