The synthesis and study of the fluorescent probe for sensing Cu2+ based on a novel coumarin Schiff-base

A novel, fluorescent probe was synthesized from 2,4-dihydroxybenzaldehyde and 8-hydroxyquinoline for sensing Cu2+ by the naked eye. The structure was confirmed by IR, MS, 1H NMR, 13C NMR and the spectral properties of the probe were investigated. It exhibited strong fluorescence responses toward Cu2+ and high selectivity over other metal ions. The binding constant between the probe and Cu2+ was calculated using Benesi–Hildebrand equation.

Graphical abstractA novel fluorescent probe has been synthesized for sensing Cu2+ by the “naked-eye” method. It exhibited very strong fluorescence responses to Cu2+ and a remarkably high selectivity to Cu2+ over other metal ions. The binding constant between the fluorescent probe and Cu2+ was calculated by the fluorescent method.Figure optionsDownload full-size imageDownload as PowerPoint slide