Cu2+ions-responsive Fluorescent Sensor Based on Thiourea Tetraphenylethylene
The development of highly selective and sensitive Cu2+ion sensors is of great significance in the chemical,biological and environmental fields due to the important role of Cu2+in a variety of pathophysio-logical processes.Firstly,a novel fluorescent sensor TPE-A with aggregation-induced emission was con-structed by introducing phenyl isothiocyanate into a tetraphenylene skeleton for the detection of Cu2+.In the meanwhle,TPE-A showed a fast and sensitively selective fluorescence"off"response to Cu2+in aqueous media.Secondly,at the instant of addition of Cu2+ions,a visible colour change from bright blue to colourless was clearly observed by the naked eye under 365 nm UV light.Lastly,the reaction mechanism was revealed by fluorescence titration,infrared analysis and density functional theory(DFT)calculations.In addition,the results of Cu2+ion detection showed that the molecule had a detection limit of 3.12×10-7 mol/L.Generally speaking,this study provides a valuable method for the design and preparation of AIE-activated fluorescent sensors for the detection of Cu2+ions.
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