A new calix[4]arene with three ester groups and an appended naphthalenic fluorophore has been synthesized; investigation of its photophysical and complexing properties towards alkali and alkaline-earth metal ions reveals a high selectivity for Na+ in water–ethanol mixtures.
Leray, I., O’Reilly, F., Habib Jiwan, J.-L., Soumillion, J.-P., & Valeur, B. (1999). A new calix [4] arene-based fluorescent sensor for sodium ion. Chemical Communications, 9, 795-796. https://doi.org/10.1039/a900020h (Original work published 1999)