A highly fluorescent Al~(3+)-based metal-organic framework (CYCU-3) for selective and sensitive sensing of 2,4,6-trinitrophenol

摘要

In this work, a luminescent Al3+-metal-organic framework, CYCU-3 was successfully synthesized and characterized by X-ray diffraction, Fourier transform infrared spectra, scanning electron microscope and N-2 adsorption at 77K analysis. Due to the rich conjugated systems in the ligand, CYCU-3 exhibits strong fluorescence emission. More importantly, charge transfer from ligand to Al3+ induce an obvious blue shift in the emission spectrum of CYCU-3, which can result in more effective energy transfer to 2,4,6-trinitrophenol (TNP) due to larger overlap in the emission spectrum of CYCU-3 and UV adsorption band of TNP. Based on the energy transfer together with electron transfer, CYCU-3 can serve as a highly selective and sensitive, and renewable fluorescence sensor for TNP. In conclusion, this work may provide an effective method to design highly effective fluorescence turn-off sensor for the targets.