Numerical Recognition System and Ultrasensitive Fluorescence Sensing Platform for Al 3+ and UO 2 2+ Based on Ln (III)-Functionalized MOF-808 via Thiodiglycolic Acid Intermediates.

Continuous accumulation of Al in the human body and unintended leakage of UO have posed a great threat to human health and the global environment; thus searching an efficient probe for the detection of Al and UO is of great importance. Herein, we designed and synthesized two hydrolytically stable Eu- and Tb-functionalized MOF materials and via thiodiglycolic acid (TDA) intermediates by the postsynthetic modification method. Among them, was applied to construct numerical recognition systems of multiples of three and four by the combination of fluorescent signals, hierarchical cluster analysis, and logical gates. In addition, exhibits good selectivity and sensitivity for the detection of Al and UO. The detection limit is calculated to be 0.085 ppm for Al and 0.082 ppm for UO in aqueous solutions, which is lower than or close to that of latest reported Ln-MOFs. Moreover, the probe shows excellent hydrolytic stability and luminescence stability in the pH range of 4-11, further providing solid evidence for the practical application of . More importantly, a mixed matrix hydrogel was prepared to achieve the visual detection of Al, which broadens the potential in real-world sensing applications.