Chemical Research in Chinese Universities ›› 2014, Vol. 30 ›› Issue (3): 362-367.doi: 10.1007/s40242-014-4008-z

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Coumarin Modified Rhodamine Derivative:Fluorescent Chemosensor Selectively Recognizing Al3+ and Ca2+

CAO Li, JIA Chunman, ZHANG Qi, CHEN Da, ZHANG Chunyan, QIAN Yaao   

  1. Hainan Provincial Key Lab of Fine Chem., Key Study Center for Tropical Resources Utilization, Ministry of Education, Hainan University, Haikou 570228, P. R. China
  • Received:2014-01-06 Revised:2014-02-20 Online:2014-06-01 Published:2014-03-05
  • Contact: ZHANG Qi E-mail:hnfinechem@163.com
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21261008), the Key Scientific and Technological Plan Project of Hainan Province, China(No.ZDXM20110024), the Hainan Province Special Integration Fund of Industry and Research, China(No.CXY20130010) and the International Science and Technology Cooperation Projects of Hainan Province, China(No. KJHZ2014-05).

Abstract:

A fluorescent probe with a coumarin moiety bound to rhodamine 6G hydrazide(1) was synthesized. Its sensing behavior toward various metal ions was investigated with fluorescence methods. Compound 1 displays different fluorescence emission responses to Al3+ and Ca2+ at the same excitation wavelength in the visible light region, while no changes occur after the addition of other metal ions. The binding ratios of the complexs of 1-Al3+ and 1-Ca2+ are both 2:1 according to the Job plot and high resolution mass spectrometer(HRMS) experiments. Moreover, emission spectrum of 1-Ca2+ complex and absorption spectrum of the rhodamine dyes overlap largely. When Al3+ was added to the 1-Ca2+ system, calcium in complex 1-Ca2+ can be displaced by Al3+, resulting in the output of another ratiometric sensing signal, which demonstrates that the 1-Ca2+ complex can be served as a new and effective fluorescence resonance energy transfer(FRET) donor for rhodamine derivatives.

Key words: Chemosensor, Aluminium ion, Calcium ion, Fluorescence resonance energy transfer(FRET)