Redox‐Responsive Macrocyclic Hosts Based on Calix[4]arene and Calix[4]resorcinarene Scaffolds

Calix[4]arenes and calix[4]resorcinarenes are well-known macrocyclic hosts that can be tailored to bind guests of very different natures, including anions, cations, various neutral molecules. The molecular architectures the altered in many ways: by attaching polar or hydrophilic groups, extending inner cavities with enlarged aromatic side walls, adding H-bonding sites promote formation capsules. attachment types redox-active moieties renders calix[4]arene calix[4]resorcinarene derivatives electrochemically active, enabling them either control guest-binding properties receptors used as electrochemical sensors. This review will focus on appended such ferrocene, tetrathiafulvalene, quinone. We discuss serve redox sensors for cations electron-deficient molecules release their controlled stimuli.