A fluorescence “turn-on” sensor for multiple analytes: OAc− and F− triggered fluorogenic detection of Zn2+ in a co-operative fashion

The ligand L1 has been synthesized as a fluorescent chemosensor based on excited state intramolecular proton transfer (ESIPT) which undergoes AcO−/F− triggered sharp fluorescence enhancement towards Zn2+ in a co-operative fashion to form L1(O−)⊃Zn2+ with stoichiometry 2:1 in acetonitrile solvent system.179