Xiong Linli, Zheng Yong, Wang Haibo, Yan Jiangyang, Huang Xuguang, Meng Hongyun, Tan Chunhua
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School for Information and Optoelectronic Science and Engineering, South China Normal University, 510006 Guangzhou, People's Republic of China.
Methods Appl Fluoresc. 2022 May 11;10(3). doi: 10.1088/2050-6120/ac6b88.
A novel fluorescence sensor for successive detection of Cuand Febased on anti-BHderivative which possesses 5-hydroxyisoquinoline as an ionophore was synthesized via a one-pot and its structure and photophysical properties were characterized by NMR, HRMS, FTIR, UV-vis, PL and theoretical calculation. The fluorophore displays two emission peaks at 460 nm and 670 nm in THF solution coming from the emission of the locally excited state and intramolecular charge transfer fluorescence, respectively. The complex exhibited obvious aggregation-induced emission enhancement (AIEE) characteristics in THF/HO solution by increasing the aqueous concentration from 70% to 95%. The AIEE molecules showed a high selectivity towards Cuover other metal ions by forming a 2:1 metal-to-ligand complex in THF/HO (w = 20%) solution, the fluorescence intensity increased as a linear function of the Cuconcentration at 460 nm due to the inhibition of PET effect. The fluorescent emission was quenched linearly by the addition of Fe, which provides a method for successive determination of Cuand Febased on 'off-on-off' fluorescence of the fluorescent. The detection limit of Cuand Fewas 5.7 × 10M and 7.2 × 10M respectively. Morever, a rapid identification of Cuin the aqueous solution by naked eyes can be realized. In addition, the molecules were pH-sensitive, the fluorescence quenching can be observed in strongly alkaline environment. The method has been applied to the determination of copper ions in water samples with satisfactory results.
一种基于具有5-羟基异喹啉作为离子载体的抗BH衍生物的新型荧光传感器，通过一锅法合成，其结构和光物理性质通过核磁共振（NMR）、高分辨质谱（HRMS）、傅里叶变换红外光谱（FTIR）、紫外可见光谱（UV-vis）、荧光光谱（PL）和理论计算进行了表征。该荧光团在四氢呋喃（THF）溶液中分别在460 nm和670 nm处显示出两个发射峰，分别来自局域激发态发射和分子内电荷转移荧光发射。通过将水相浓度从70%提高到95%，该配合物在THF/H₂O溶液中表现出明显的聚集诱导发射增强（AIEE）特性。在THF/H₂O（w = 20%）溶液中，该AIEE分子通过形成2:1的金属与配体配合物，对Cu²⁺比对其他金属离子具有高选择性，由于PET效应的抑制，在460 nm处荧光强度随Cu²⁺浓度呈线性增加。通过加入Fe³⁺，荧光发射被线性猝灭，这为基于荧光的“关-开-关”实现Cu²⁺和Fe³⁺的连续测定提供了一种方法。Cu²⁺和Fe³⁺的检测限分别为5.7×10⁻⁸ M和7.2×10⁻⁸ M。此外，还可以通过肉眼快速识别水溶液中的Cu²⁺。此外，该分子对pH敏感，在强碱性环境中可观察到荧光猝灭。该方法已应用于水样中铜离子的测定，结果令人满意。
