Abstract
Detection of metal ions and anions by fluorescent turn-on sensors are attractive and challenging. In this work, we designed and synthesized a ferrocene-modified bispyrene derivative, DPFc, as a fluorescent turn-on sensor to detect both Cu2+ and Cl−. The probe has good fluorescence stability in acetonitrile and can form an intramolecular excimer. When Cl− is present in the system, the addition of Cu2+ could effectively enhance the fluorescence of the probe, and the turn-on response to Cu2+ is selective by comparison with other metal ions. The probe also shows selective responses to Cl− over other type anions when an inert copper salt is present. The fluorescent turn-on responses to Cu2+ is attributed to the oxidation of Fe(II) in the ferrocene unit into Fe(III) by Cu2+ that prohibits the electron transfer-induced fluorescence quenching. UV–vis absorption measurements revealed that the presence of Cl− helped to bind with the probe and realized the oxidation of ferrocene unit by Cu2+. The present sensor could be used as a selective turn-on sensor for both Cu2+ and Cl−.
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