Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (3): 419-423.doi: 10.1007/s40242-013-2449-4

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Highly Sensitive and Selective Chemosensor for Cu2+ Based on a Schiff Base

CAO Ben-nan1, HU Qin1, HUANG Yan2, JIA Chun-man1, ZHANG Qi1,2   

  1. 1. Key Study Center of Ministry of Education for Tropical Resources Utilization, Hainan Provincial Key Lab of Fine Chemicals, Hainan University, Haikou 570228, P. R. China;
    2. Department of Chemistry and Chemical Engineering, Jiangsu University, Jiangsu 212013, P. R. China
  • Received:2012-11-20 Revised:2013-02-04 Online:2013-06-01 Published:2013-05-15
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21166008, 21261008), the Natural Science Foundation of Hainan Province, China(No.209001), the Youth Fund of Hainan University, China(No.qnjj1169) and the Technology Support Program of the Jiangsu Province, China(No.SBE 201077304).

Abstract:

A new chemosensor based on a Schiff base has been designed and synthesized. Its sensing behavior toward various metal ions was investigated by fluorescence and UV-Vis spectroscopic methods. The fluorescence of the sensor was quenched and the color rapidly changed from canary yellow to brown after the addition of Cu2+, while no changes occurred after the addition of other metal ions, which contributes to the detection of Cu2+ with naked eyes. The fluorescence quantum yield of the ligand was calculated to be 0.52. The corresponding detection limit of Cu2+ was 5.721×10-7 mol/L, and the 1:1 binding mode of the sensor with Cu2+ was revealed by Job's plot.

Key words: Chemosensor, Schiff base, Copper ion, Naked-eye detection, Quench