State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, China.
Talanta. 2019 May 1;196:515-522. doi: 10.1016/j.talanta.2018.12.088. Epub 2018 Dec 27.
We report here the investigation of using a luminescent europium organic framework, [Eu(MTBC)(OH)(DMF)(HO)]·2DMF·7HO (denoted as compound 1), for detecting of both Cu and UO with high sensitivity. Based on the spectroscopy analysis, compound 1 could selectively respond to Cu and UO ions among other selected monovalent, divalent, trivalent metal cations based on a turn-off mechanism. The detection limit of compound 1 towards Cu ion was as low as 17.2 μg/L, which is much lower than the maximum tolerable concentration of Cu in drinking water (2 mg/L) defined by United States Environmental Protection Agency. On the other hand, the detection limit towards UO ions is 309.2 μg/L, which could be used for detecting uranium in relative severely contaminated areas. The concentration-dependent luminescence intensity evolution process could be fully understood by the absorption kinetics and isotherm investigations. Furthermore, the quenching mechanism was elucidated by the UV-vis, excitation, luminescence, and lifetime studies. Compound 1, as the first MOF based luminescence probe for both Cu and UO ions, provides insight into developing MOF-based multifunctional sensors for both nonradioactive and radioactive elements.
我们在此报告了一种使用发光镧系元素有机骨架[Eu(MTBC)(OH)(DMF)(HO)]·2DMF·7H₂O（表示为化合物 1）来检测 Cu 和 UO 的灵敏度高的研究。基于光谱分析，化合物 1 可以基于关闭机制选择性地响应 Cu 和 UO 离子，而不是其他选定的单价、二价、三价金属阳离子。化合物 1 对 Cu 离子的检测限低至 17.2μg/L，远低于美国环境保护署规定的饮用水中 Cu 的最大允许浓度（2mg/L）。另一方面，对 UO 离子的检测限为 309.2μg/L，可用于检测相对污染严重地区的铀。通过吸收动力学和等温线研究，可以充分理解浓度依赖性发光强度演化过程。此外，通过 UV-vis、激发、发光和寿命研究阐明了猝灭机制。作为第一个用于 Cu 和 UO 离子的基于 MOF 的荧光探针，化合物 1 为开发用于非放射性和放射性元素的基于 MOF 的多功能传感器提供了新的思路。
