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Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy v.174, 2017년, pp.307 - 315   SCI SCIE
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New highly selective turn-on fluorescence receptor for the detection of copper (II)

Nan, Qian (Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China ) ; Rong, Pu (Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China ) ; Jiang, Yunbao (Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China ) ; Yang, Rui (Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China ) ;
  • 초록  

    Abstract Three new receptors ( 1a–c ) bearing a p -dimethylaminobenzamide fluorophore have been synthesized and evaluated in terms of their fluoroionophoric properties towards various metal ions. Notably, receptors 1a and 1c exhibited dramatic fluorescent enhancement towards Cu 2+ in acetonitrile. Subsequent investigations revealed that the highly selective behavior of these receptors towards Cu 2+ could be attributed to the Cu 2+ -mediated oxidative cyclization of these compounds to the corresponding 1,3,4-oxadiazoles. Solvent effects and quantum calculations indicated that 1a and 1c both possessed an intramolecular charge transfer channel, which could be obstructed by the oxidative cyclization of these receptors. Receptor 1a was successfully applied to the determination of the Cu 2+ in drug sample with a low detection limit of 2.2×10 −8 molL −1 . Highlights Three new “turn-on” type Cu 2+ fluorescence receptors have been synthesized. This mechanism involved the Cu 2+ -mediated oxidative cyclization of the receptor. Charge transfer from an “on” to “off” state following the recognition of Cu 2+ This receptor was successfully used to determine Cu 2+ in practical samples. Graphical Abstract [DISPLAY OMISSION]


  • 주제어

    Fluorescence receptor .   Copper (II) .   Oxidative cyclization .   Intramolecular charge transfer.  

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