Used as a highly selective ionophore in ion-selective electrodes (ISEs), particularly for potassium ion detection in biological and environmental samples. Its rigid, pre-organized structure enhances selectivity for K⁺ over other alkali metal ions like Na⁺. Commonly incorporated into polymeric membrane sensors due to its lipophilicity, which prevents leaching and ensures long-term stability. Also applied in extraction processes for alkali metal ions in separation technologies and sensor development for clinical diagnostics, such as blood serum analysis.