MAPIEM Laboratory, University of Toulon, CS 60584, 83041, Toulon, Cedex 9, France.
IM2NP Laboratory, University of Toulon, CS 60584, 83041, Toulon, Cedex 9, France.
J Fluoresc. 2019 Jul;29(4):933-943. doi: 10.1007/s10895-019-02405-0. Epub 2019 Jul 13.
Two new chemosensors for lead (II) were synthesized based on 5-((anthracen-9-ylmethylene) amino)quinolin-10-ol (ANQ). ANQ was modified in the para position of the imine group via a methoxy link either with methylmethacrylate (ANQ-MMA) or styrene (ANQ-ST). Complexation of those molecules with Pb was studied at room temperature using UV-Visible absorption and fluorescence spectroscopies. Thanks to the UV-visible absorption spectroscopy, it appeared that ANQ-MMA formed 1:1 and 1:2 complexes with lead (II) and ANQ-ST only 1:1 complex. For both molecules, the fluorescence excitation-emission matrices (EEM) signal intensity increased from 0 to 100 μmol.L of lead (II) followed by a saturation for higher concentrations. The decomposition of the obtained EEMs gave a set of empiric fluorescent components that have been directly linked to the distribution of lead complexes obtained with the UV-visible absorption spectroscopy study. This correlation allowed to evidence metal/ligand complex stoichiometry and emerge as a new method to identify empiric components. Moreover, the two ligands showed a promising selectivity for Pb, turning them interesting probes for this hazardous metal.
基于 5-((蒽-9-基亚甲基)氨基)喹啉-10-醇 (ANQ)，合成了两种用于检测铅(II)的新型化学传感器。通过亚胺基团的对位上的甲氧基连接，对 ANQ 进行了修饰，连接的基团分别为甲基丙烯酸甲酯 (ANQ-MMA)和苯乙烯 (ANQ-ST)。在室温下使用紫外-可见吸收和荧光光谱研究了这些分子与 Pb 的络合作用。通过紫外-可见吸收光谱发现，ANQ-MMA 与铅(II)形成了 1:1 和 1:2 络合物，而 ANQ-ST 仅形成 1:1 络合物。对于这两种分子，荧光激发-发射矩阵 (EEM) 信号强度从 0 增加到 100 μmol.L 的铅(II)，然后在更高浓度下达到饱和。对获得的 EEM 进行分解，给出了一组经验荧光分量，这些分量与通过紫外-可见吸收光谱研究获得的铅络合物分布直接相关。这种相关性证明了金属/配体络合物的化学计量比，并为识别经验性成分提供了一种新方法。此外，这两种配体对 Pb 表现出良好的选择性，使它们成为这种危险金属的有前途的探针。
