Chen Juan, Guo Tingting, Gao Hongyi, He Tao, Li Jie, Li Haijian, Liu Xinyu, Li Ang
Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China.
Shunde Innovation School, University of Science and Technology Beijing, Shunde 528399, P. R. China.
ACS Appl Mater Interfaces. 2024 Nov 6;16(44):60278-60287. doi: 10.1021/acsami.4c13284. Epub 2024 Oct 25.
Metal-organic frameworks (MOFs) have emerged as a highly promising platform for various sensing applications due to their tunable structures and functionalities. In the present work, a Eu-doped mixed-ligand MOF, namely, the Eu@UiO-66-IPA, exhibited excellent luminescent properties and high fluorescence stability in aqueous media, displaying dual-emission peaks under 395 and 615 nm excitation that were readily visible to the naked eye. Importantly, the presence of fluoride ions (F) promoted the "antenna effect" between the ligand and the Eu centers, which significantly enhanced the emission intensity of the Eu characteristic peak. In addition, the addition of F also inhibited the quenching effect of high-energy O-H bonds existing in the aqueous environment. Notably, Eu@UiO-66-IPA demonstrated exceptional selectivity for F over a range of competing anions, with a remarkable limit of detection as low as 0.22 μM. The developed Eu-doped mixed-ligand MOF system offers a highly promising strategy for the simple and accurate sensing of F in practical applications.
金属有机框架材料（MOFs）因其可调节的结构和功能，已成为各种传感应用中极具前景的平台。在本工作中，一种铕掺杂的混合配体MOF，即Eu@UiO-66-IPA，在水性介质中表现出优异的发光性能和高荧光稳定性，在395和615 nm激发下显示出肉眼易于观察到的双发射峰。重要的是，氟离子（F）的存在促进了配体与铕中心之间的“天线效应”，显著增强了铕特征峰的发射强度。此外，F的添加还抑制了水性环境中高能O-H键的猝灭效应。值得注意的是，Eu@UiO-66-IPA对F在一系列竞争性阴离子中表现出优异的选择性，检测限低至0.22 μM，十分显著。所开发的铕掺杂混合配体MOF系统为实际应用中简单、准确地检测F提供了极具前景的策略。
