Highly sensitive and selective chemosensor for Cu²⁺ based on a Schiff base

Abstract

A new chemosensor based on a Schiff base has been designed and synthesized. Its sensing behavior toward various metal ions was investigated by fluorescence and UV-Vis spectroscopic methods. The fluorescence of the sensor was quenched and the color rapidly changed from canary yellow to brown after the addition of Cu²⁺, while no changes occurred after the addition of other metal ions, which contributes to the detection of Cu²⁺ with naked eyes. The fluorescence quantum yield of the ligand was calculated to be 0.52. The corresponding detection limit of Cu²⁺ was 5.721×10⁻⁷ mol/L, and the 1:1 binding mode of the sensor with Cu²⁺ was revealed by Job’s plot.

Keywords

Chemosensor / Schiff base / Copper ion / Naked-eye detection / Quench

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