Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (3): 347-351.doi: 10.1007/s40242-015-4403-0

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A Highly Selective Fluorescent Chemosensor for Cu2+

GUAN Jie, ZHANG Peng, WEI Taibao, LIN Qi, YAO Hong, ZHANG Youming   

  1. Key Laboratory of Eco-environment-related Polymer Materials, Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, P. R. China
  • Received:2014-10-23 Revised:2015-01-26 Online:2015-06-01 Published:2015-02-12
  • Contact: ZHANG Youming E-mail:zhangyouming@nwnu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21064006, 21262032, 21161018).

Abstract:

A new Zn2+ probe L2-Zn(L2=naphthofuran carbonylhydrazone derivant) was synthesized as a fluorescence chemosensor for Cu2+, by which Cu2+ ion could be detected with high selectivity and sensitivity in a wide pH range via a displacement “turn-off” signaling strategy. Whereas the coordination between Zn2+ and L2 resulted in a considerable enhancement of typical luminescence of a naphthalofuran group in complex L2-Zn, the addition of Cu2+ ion led to a dramatic decrease in the emission intensity of probe L2-Zn at about 503 nm(excitation at 423 nm). The competitive fluorescent experiments showed that other metal ions, such as Hg2+, Fe3+, Ag+, Ca2+, Co2+, Ni2+, Cd2+, Pb2+, Zn2+, Cr3+ and Mg2+ could not impact the detection of Cu2+. The detection limit of the novel probe L2-Zn for Cu2+ ion was as low as 2.3×10-7 mol/L, which is far lower than the guideline value of 1.6×10-5 mol/L of the United States Environmental Protection Agency.

Key words: Znic complex, Fluorescent switch, Copper ion, Turn-off signal