Used as a fluorescent sensor for detecting metal ions in solution, particularly effective in recognizing copper(II) ions due to its selective binding and visible fluorescence quenching. Its structure allows for strong interactions with transition metals, making it suitable for environmental monitoring and analytical chemistry applications. Also employed in the development of chemosensors for biological imaging, where its naphthalene groups enhance photostability and signal output. Shows potential in supramolecular chemistry for designing molecular probes and ion-selective membranes.