Abstract
We have developed a novel quinoline-derived Schiff base fluorescent Cu2+ ion probe fluorescent probe 2-(2-hydroxybenzylidene)hydrazono)methyl)- quinolin-8-ol (QH). The probe QH showed a highly selective and sensitive detection of Cu2+ with significant fluorescence “turn-on” response and the solution color changed from colorless to yellowish green. The results of fluorescence titration, Job's plot and HRMS analysis suggested that the stoichiometry of probe QH and Cu2+ was found to be 1:1. The detection limit was found to be 8.08×10−9 M, which far lower than the maximum allowable level of the U.S. Environmental Protection Agency limit (20 μM) for drinking water. The bonding mechanism has been discussed according to FT-IR and DFT calculations. Furthermore, probe QH has been successfully applied to living cell imaging.
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