Used as a selective ionophore in ion-selective electrodes (ISEs), particularly for potassium ion detection due to its high affinity for K+ over other alkali metal ions. Its lipophilic tert-butyl group enhances membrane compatibility in polymeric sensor membranes. Also employed in supramolecular chemistry for host-guest complexes involving alkali metal cations. Finds application in analytical chemistry for sensing and separation processes where selective cation binding is required.