College of Chemical Engineering, Qinghai University, Xining 810016, China.
Anal Methods. 2023 Apr 27;15(16):1953-1958. doi: 10.1039/d3ay00044c.
As an important trace element in the human body, the concentration of Cu has an important impact on the environment and human health, and its quantitative determination is of great significance in the fields of environmental protection and food safety. Here, a ratiometric fluorescent probe based on Tb(III)-functionalized UiO-66-type MOFs has been synthesized a facile post-synthetic modification method by employing mixed linkers containing terephthalic acid and 2,6-pyridinedicarboxylic acid for Cu detection. The blue fluorescence intensity at 440 nm from the ligands of MOFs does not change much with increasing Cu concentrations and can be used as a reference signal, while the green fluorescence of Tb can be rapidly and selectively quenched, causing fluorescence intensity at 547 nm to decrease. The probe can be used as a ratiometric sensor for Cu detection with a good linear response and low detection limit. The use of the probe for the determination of Cu in real water samples and drinks shows good practicality. This method for Cu detection is simple, specific and visualized to meet the needs of environmental monitoring and food analysis and provides a new strategy for the construction of new copper ion fluorescent sensors to analyze complex samples.
作为人体中的一种重要微量元素，Cu 的浓度对环境和人类健康有重要影响，其定量测定在环境保护和食品安全领域具有重要意义。在这里，我们通过采用含有对苯二甲酸和 2,6-吡啶二甲酸的混合配体制备了一种基于 Tb(III)功能化 UiO-66 型 MOFs 的比率荧光探针，用于 Cu 检测。MOFs 配体的 440nm 处的蓝色荧光强度随 Cu 浓度的增加变化不大，可以作为参考信号，而 Tb 的绿色荧光可以被快速选择性猝灭，导致 547nm 处的荧光强度降低。该探针可用作 Cu 检测的比率传感器，具有良好的线性响应和低检测限。该探针在实际水样和饮料中 Cu 的测定中表现出良好的实用性。这种 Cu 检测方法简单、特异性强、可视化，满足了环境监测和食品分析的需求，为分析复杂样品的新型铜离子荧光传感器的构建提供了新策略。
