A dual functional fluorescent sensor for the detection of Al3 and Zn2 in different solvents
A dual functional fluorescent sensor for the detection of Al3 and Zn2 in different solvents
复制标题
用于检测不同溶剂中 Al3 和 Zn2 的双功能荧光传感器
DOI：
10.1039/c9nj03298c
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发表时间：
2019
影响因子：
3.3
通讯作者：
Zhang Yanxia
中科院分区：
文献类型：
--
作者：
Xu Yuankang;Wang Hanyu;Zhao Jinyan;Yang Xiaofeng;Pei Meishan;Zhang Guangyou;Zhang Yanxia
以咪唑[2,1-b]噻唑和2-羟基-1-萘醛为基础，设计合成了一种新型荧光传感器(E)- n′-（（2-羟基萘-1-基）亚甲基）咪唑[2,1-b]噻唑-6-碳腙(X)，可用于检测甲醇缓冲溶液中的Al3+和乙醇缓冲溶液中的Zn2+，检出限分别为1.45 × 10−7 M和1.29 × 10−8 M。在其他金属离子存在下，X对Al3+和Zn2+具有较高的灵敏度和选择性。在连续添加金属离子（Al3+和Zn2+）和PPi 6个循环后，X的荧光强度是可逆的，表现出高效的“开-关”荧光行为。X与Al3+和Zn2+的络合比为1:1，经质谱和B-H方程证实。采用基于B3LYP/6-31G(d)基集的Gaussian 09算法，通过DFT/TDDFT计算验证了X与金属离子（Al3+和Zn2+）的结合模式和传感机理。
(E)-N′-((2-Hydroxynaphthalen-1-yl)methylene)imidazo[2,1-b]thiazole-6-carbohydrazide (X), a new fluorescent sensor, was designed and synthesized based on imidazo[2,1-b]thiazole and 2-hydroxy-1-naphthaldehyde, which could be used to detect Al3+ in methanol buffer solution and detect Zn2+ in ethanol buffer solution with detection limits of 1.45 × 10−7 M and 1.29 × 10−8 M, respectively. X showed high sensitivity and selectivity towards Al3+ and Zn2+ in the presence of other metal ions. The fluorescence intensity of X was reversible even after six cycles with the sequentially alternative addition of metal ions (Al3+ and Zn2+) and PPi, showing an efficient “off–on–off” fluorescence behavior. The complexation ratio of X to Al3+ and Zn2+ was 1 : 1, which was proved by mass spectrometry and the B–H equation. The binding mode and sensing mechanism of X with metal ions (Al3+ and Zn2+) were verified by DFT/TDDFT calculations using Gaussian 09 based on the B3LYP/6-31G(d) basis set.