Post-modified dual functional UiO-sensor for selective detection of ozone and tandemly derived sensing of Al3

Analytical Chemistry
Ming-Hua XieXiu-Li Yang

Abstract

Development of highly sensitive and selective fluorescent sensors towards hazardous analytes represents a great progress in fabricating sensing devices for practical applications. In this work, a highly selective sensor with dual functions has been fabricated via facile post-modification of the UiO-MOF. Butene modified salicylaldehyde is covalently linked to the UiO-66 scaffold via efficient Schiff-base reaction, resulting in a highly fluorescent ozone sensor of UiO-66-butene. Ozonolysis of the terminal olefin followed by β-elimination could significantly quench the bright blue fluorescence of UiO-66-butene, and lin-ear turn-off detection of ozone in the range of 0-100 μM is well established. The detection is highly sensitive and selective, and a detection limit of 73 nM was calculated. Remarkably, the ozonolysis afforded product could further act as a selective sensor for Al3+ via turn-on fluorescence with a detection limit of 142 nM, representing a second potential sensing function. The chemically selective sequential ozonolysis/β-elimination and remarkable dual functions offer the exclusive detection of ozone over other oxidative species as well as Al3+ over other cations following a tandem process, representing the first ex...Continue Reading

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