荧光
席夫碱
水溶液中的金属离子
化学
异构化
质子核磁共振
光化学
水溶液
离子
分子
检出限
共轭体系
选择性
物理化学
立体化学
结晶学
有机化学
催化作用
色谱法
物理
量子力学
聚合物
作者
Yanling Pang,Desu Meng,Jian Liu,Shengxia Duan,Jingru Fan,Longyu Gao,Xinshu Long
出处
期刊:Molecules
[Multidisciplinary Digital Publishing Institute]
日期:2023-03-30
卷期号:28 (7): 3090-3090
被引量:12
标识
DOI:10.3390/molecules28073090
摘要
Two new Schiff base fluorescent probes (L and S) were designed for selectively detecting Al3+ ions in aqueous medium. Structural characterization of the purely synthesized compounds was acquired by IR, 1H NMR and 13C NMR. Moreover, their photochromic and fluorescent behaviors have been investigated systematically by UV-Vis absorption and fluorescence spectra. The two probes have both high selectivity and sensitivity toward Al3+ ions in aqueous medium. The 2:1 stoichiometry between the Al3+ and probes was verified by Job's plot. Moreover, the limits of detection (LOD) for Al3+ by L and S were 1.98 × 10-8 and 4.79 × 10-8 mol/L, respectively, which was much lower than most previously reported probes. The possible recognition mechanism was that the metal ions would complex with Schiff base probes because of the prevalence of the species optimal for complex formation, inhibiting the structural isomerization of conjugated double bonds (-C=N-), inhibiting the proton transfer process in the excited state of the molecules and resulting in changes of its color and fluorescence behavior. Furthermore, the probes will have potential applications for selectively, detecting Al3+ ions in the environmental system with high accuracy and providing a new strategy for the design and synthesis of multi-functional sensors.
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