Zhang Xianfa, Yu Shuaibing, Pang Xuliang, Ren Xiaochen, Zhang Bo, Kong Jinming, Li Lianzhi
School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, PR China.
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2023 Dec 15;303:123205. doi: 10.1016/j.saa.2023.123205. Epub 2023 Jul 25.
A solvent-directed, new Schiff base multiple correspondence fluorescent probe, (E)-2-(2-hydroxybenzylidene) hydrazine-1-carboxamid (L), was synthesized for selective sensing of Cu and Mg ions. L showed excellent selectivity and high sensitivity toward Cu in "turn off" mode with a detection limit of 40.5 nM in 10 mM, pH = 7.0 PBS buffer. Contrary to that, when acetonitrile was used as the solvent, L exhibited highly selective and sensitive fluorescence sensing ability for Mg in "turn on" mode with a detection limit of 9.5 nM. L can coordinate to Cu and Mg in a 1:1 molar ratio, respectively, evidenced by Job's plot analysis. Their binding modes were investigated by NMR, IR and XPS spectroscopies. Moreover, the satisfied results were obtained when L was used to detect Cu and Mg in real water samples.
合成了一种溶剂导向的新型席夫碱多重对应荧光探针（E）-2-（2-羟基苄叉基）肼-1-甲酰胺（L），用于选择性检测铜离子和镁离子。在10 mM、pH = 7.0的磷酸盐缓冲盐溶液（PBS）中，L对铜离子表现出优异的选择性和高灵敏度，呈“猝灭”模式，检测限为40.5 nM。相反，当使用乙腈作为溶剂时，L对镁离子表现出高度选择性和灵敏的荧光传感能力，呈“开启”模式，检测限为9.5 nM。通过Job曲线分析证明，L能分别与铜离子和镁离子以1:1的摩尔比配位。通过核磁共振（NMR）、红外光谱（IR）和X射线光电子能谱（XPS）对它们的结合模式进行了研究。此外，当L用于实际水样中铜离子和镁离子的检测时，获得了令人满意的结果。
