Fluorescent “Turn-Off” Detection of Fluoride and Cyanide Ions Using Zwitterionic Spirocyclic Meisenheimer Compounds
作者:Marina Benet、Marc Villabona、Carles Llavina、Silvia Mena、Jordi Hernando、Rabih O. Al-Kaysi、Gonzalo Guirado
DOI:10.3390/molecules22111842
日期:——
Stable zwitterionic spirocyclic Meisenheimer compounds were synthesized using a one-step reaction between picric acid and diisopropyl (ZW1) or dicyclohexyl (ZW3) carbodiimide. A solution of these compounds displays intense orange fluorescence upon UV or visible light excitation, which can be quenched or “turned-off” by adding a mole equivalent amount of F− or CN− ions in acetonitrile. Fluorescence