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Design and synthesis of a new highly efficient adjustable Ln-MOF for fluorescence sensing and information encryption. | LitMetric

Design and synthesis of a new highly efficient adjustable Ln-MOF for fluorescence sensing and information encryption.

Spectrochim Acta A Mol Biomol Spectrosc

School of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Laboratory of New Energy & New Function Materials, Yanan University, Yan'an 716000, China.

Published: December 2024

Elemental analysis, infrared spectroscopy, and X-ray single crystal diffraction indicated that a novel metal-organic framework (Tb-MOF) designated as 0.5n[Hbpy]·[Tb(dpa)(HO)]·4nHO was synthesized successfully, (where Hdpa = 5-(3, 4-dicarboxy- phenoxy) isophenic acid, bpy = protonated 4,4'-bipyridine). Tb-MOF adopts a 3D network structure based on Tb ions and the (dpa) ligand through µ: η, η, η, η binding modes. Various luminescent EuTb-MOFs were prepared by adjusting Tb and Eu concentrations. Fluorescence analysis revealed Tb-MOF's strong fluorescence and excellent sensing ability for pollutants like nitrobenzene (NB), ornidazole (ORN), and fluridine (Flu) in water. It is worth noting that the fluorescence quenching rate of Tb-MOF for nitrobenzene can reach 97.1 %, which is also one of the highest among Ln-MOFs. XPS, LUMO orbital energy levels, fluorescence lifetime, and UV absorption were employed to explore the fluorescence quenching mechanism. Tb-MOF demonstrates robust anti-counterfeiting properties and stability, particularly against Flu, and allows rapid in situ imaging of pesticide residues on vegetables. Moreover, leveraging the adjustable emission spectra of EuTb-MOF, a barcode system for anti-counterfeiting labels has been developed, showing the versatility of stable metal-organic frameworks in advanced technologies for anti-counterfeiting applications.

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Source
http://dx.doi.org/10.1016/j.saa.2024.125669DOI Listing

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