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摘要
A new 1,8-naphthalimide-based fluorescence turn off chemosensor, N-phenyl-4-(3,3-((2-aminoethyl)azanediyl)dipropanoic acid)-1,8-naphthalimide (MAST), for the detection of Cu2+ was synthesized. Upon treatment with Cu2+, in coexistence with various competitive metal ions in HEPES-buffered dimethylsulfoxide (DMSO) solution (v/v, 1:1; pH 7.4), MAST displayed a high selectivity toward Cu2+ with a fluorescence quenching of 83.67%. Additionally, a good linear response of MAST for the detection of Cu2+ was obtained in the concentration range of 10 x 10(-6) to 50 x 10(-6) M. A 1:1 stoichiometric interaction of MAST with Cu2+ was observed, and the association constant and detection limit were calculated to be 1.37 x 10(6) and 0.69 x 10(-8) M, respectively. The sensing mechanism of the chemosensor toward Cu2+ was proposed due to the effect of the paramagnetic nature of Cu2+ and reverse-photo-induced electron transfer (PET) process. Ultimately, the proposed chemosensor was applied to quantify Cu2+ in real-world water samples, with excellent recovery rates of 98.00-109.80% observed.
- 出版日期2017-12
- 单位兰州交通大学
