化学
检出限
荧光
席夫碱
滴定法
化学计量学
螯合作用
离子
镉
无机化学
密度泛函理论
异构化
分析化学(期刊)
光化学
物理化学
结晶学
计算化学
色谱法
有机化学
催化作用
量子力学
物理
作者
Dong Yuan,Jialin Ma,Zhou Yu,Xinxin Liu,Zhen Zhao
标识
DOI:10.1016/j.ica.2022.120884
摘要
Herein, we report a reversible and easy assembled fluorometric probe (4-(quinolin-2-ylmethylene)aminoanisole, QMAA) for the highly selective and sensitive detection of cadmium ion (Cd2+) in DMF solution with PBS buffer (0.01 M, pH = 7.30). The strong fluorescence response of QMAA to Cd2+ along with a bright blue fluorescence was mainly ascribed to the formation of the complex QMAA–CdCl2. The results show that the complexation can inhibit the CN isomerisation and photo–induced electron transfer (PET), and further lead to the occurrence of chelation fluorescence enhancement. The 1:1 stoichiometry of the complex between QMAA and cadmium ion was studied by fluorescence titration, Job’s plot analysis, 1H NMR, FT–IR, and ESI–MS data, and was further confirmed by the single crystal structure of the complex QMAA–CdCl2. Density functional theory (DFT) calculations have verified the mechanism of fluorescence enhancement. In addition, the limit of detection of QMAA for Cd2+ was as low as 0.1547 µM (at 10–7 M level), which was lower than the acceptable limit of Cd2+ level in drinking water defined by World Health Organization. The analog experiments about nature contamination of Cd2+ in real samples were finished.
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