| 英文摘要 |
A series of chemical-sensors, benzimidazole-coumarin (M1, M2 & M3), were synthesized and characterized by 1H NMR, mass spectrometry, and elementary analysis. UV-Vis absorption and emission spectrometer investigated the fluorescent behavior and recognition mechanism of these sensors. The absorption and emission bands of sensor M derivatives were found at 310 to 350 and 390 to 580 nm. The sensor M derivative exhibits a“turn-off”fluorescent quenching and selective complexing capacity towards Cu2+ ions. The detection limit of sensor M1 is 3.9 nM for Cu2+ ions, and the coordination ratio was found to be 2:1 ratio by the Job’s plot method. The binding constant was also calculated to be Ks 3.41×109 /M2. The fluorescence quenching seen in M-Cu2+ has been attributed to a lower HOMO-LUMO orbital gap and decreased electron donation from the coordinated imidazolyl coumarin, as found by DFT calculations. The sensor M2 was successfully applied to detect Cu2+ in the different water samples. A stable complex of sensor M-Cu2+ was characterized by the Job’s plot method, ESI-MS and DFT studies. |
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