A fluorescence turn-on chemosensor for hydrogen sulfate anion based on quinoline and naphthalimide

• A novel turn-on fluorescent sensor based on quinoline and naphthalimide was designed and synthesized.
• The sensor is highly sensitive and selective to hydrogen sulfate with 8-fold fluorescence enhancement.
• The sensing mechanism has been suggested to proceed via a hydrolysis process.

A new fluorescence turn-on chemosensor 1 based on quinoline and naphthalimide was prepared and its anion sensing toward various anions behavior was explored in this paper. Sensor 1 exhibited a highly selective fluorescent response toward HSO4− with an 8-fold fluorescence intensity enhancement in the presence of 10 equiv. of HSO4− in DMSO-H2O (1/1, v/v) solution. The sensor also displayed high sensitivity to hydrogen sulfate and the detection limit was calculated to be 7.79 × 10− 7 M. The sensing mechanism has been suggested to proceed via a hydrolysis process of the Schiff base group. The hydrolysis product has been isolated and further identified by 1H NMR and MS.

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