A simple fluorescent probe for detection of Ag+ and Cd2+ and its Cd2+ complex for sequential recognition of S2− |
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| Authors: | Shengling Li Duanlin Cao Wenbing Ma Zhiyong Hu Xianjiao Meng Zhichun Li Changchun Yuan Tao Zhou Xinghua Han |
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| Institution: | School of Chemical Engineering and Technology, North University of China, Taiyuan 030051 P.R. China.; National Demonstration Center for Experimental Comprehenisve Chemical Engineering Education, North University of China, Taiyuan 030051 P.R. China ; College of Arts and Sciences, Shanxi Agricultural University, Taigu Shanxi 030801 P.R. China |
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| Abstract: | In this study, we designed and synthesized a simple probe 2-(8-((8-methoxyquinolin-2-yl)methoxy)quinolin-2-yl)benzod]thiazole (DQT) for detection of Ag+ and Cd2+ in a CH3OH/HEPES (9 : 1 v/v, pH = 7.30) buffer system. Its structure was characterized by NMR, ESI-HR-MS and DFT calculations, and its fluorescence performance was also investigated. Probe DQT showed fluorescence quenching in response to Ag+ and Cd2+ with low detection limits of 0.42 μM and 0.26 μM, respectively. Importantly, the complexation of the probe with Cd2+ resulted in a red shift from blue to green, making it possible to detect Ag+ and Cd2+ by the naked eye under an ultraviolet lamp. The DQT-Cd2+ complex could be used for sequential recognition of S2−. The recovery response could be repeated 3 times by alternate addition of Cd2+ and S2−. A filter paper strip test further demonstrated the potential of probe DQT as a convenient and rapid assay.A fluorescent probe for detection of Ag+ and Cd2+ and its Cd2+ complex for sequential recognition of S2−. |
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