Turn on ESPT: Novel salicylaldehyde based sensor for biological important fluoride sensing

• New salicylaldehyde based fluorescent sensor 1 was designed.
• Sensor 1 displayed ‘turn on’ fluorescence for biologically important fluoride ion.
• ESPT was responsible for the fluoride-induced fluorescence enhancement.

A novel and simple salicylaldehyde based anion fluorescent sensor 1 has been designed, which can selectively sense fluoride by ‘turn on’ excited-state intermolecular proton transfer (ESPT). The binding constant and the stoichiometry were obtained by non-linear least-square analysis of the titration curves.

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