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A highly sensitive and selective chemosensor for Pb2+ based on quinoline-coumarin
Xianjiao Meng1, Duanlin Cao1, Zhiyong Hu1,2
1School of Chemical Engineering and Technology, North University of China Taiyuan 030051 P. R. China mawenbing@nuc.edu.cn.
Abstract:
In this study, a highly sensitive and selective fluorescent chemosensor, ethyl(E)-2-((2-((2-(7-(diethylamino)-2-oxo-2H-chromene-3-carbonyl)hydrazono)methyl)quinolin-8-yl)oxy)acetate (1), was synthesized and characterized by 1H NMR, 13C NMR and ESI-MS. Sensor 1 showed an "on-off" fluorescence response to Pb2+ with a 1 : 1 binding stoichiometry in CH3CN/HEPES buffer medium (9 : 1 v/v). The detection limit of sensor 1 to Pb2+ was determined to be 0.5 μM, and the stable pH range for Pb2+ detection was from 4 to 8.
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