Charge transfer based “turn-on” chemosensor for Zn2 + ion recognition using new triaryl pyrazoline derivative

• The receptor PY was synthesized by a simple method with high yield.
• The detection limit of Zn2 + by PY was very low (1.02 μM).
• The reversible behavior of the receptor PY towards Zn2 + was studied with EDTA.
• The turn-on response with remarkable red shift in the fluorescence spectra was further supported by quantum (DFT) calculations.

The fluoroionophore PY serves as a selective and fluorimetric chemosensor for Zn2 + based on charge transfer (CT). A mechanism for the binding mode was proposed based on fluorescence changes, NMR experiments and theoretical calculations. The 1:1 stoichiometry between Zn2 + and the sensor was deduced from Job's plot. The addition of EDTA quenches the fluorescence of PY.Zn2 + complex offers PY as a reversible chemosensor.

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