Amino group dependent sensing properties of metal-organic frameworks: selective turn-on fluorescence detection of lysine and arginine

Recently, metal-organic frameworks (MOFs) have been extensively investigated as fluorescence chemsensors due to their tunable porosity, framework structure and photoluminescence properties. In this paper, a well-known Zr( iv )-based MOF, UiO-66-NH 2 was demonstrated to have capability for detection...

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Bibliographic Details
Published in:RSC advances 2020-10, Vol.1 (61), p.37449-37455
Main Authors: Dong, Jing, Zhang, Xiu-Du, Xie, Xia-Fei, Guo, Fan, Sun, Wei-Yin
Format: Article
Language:English
Subjects:
Amino acids
Aqueous solutions
Chemistry
Emission spectra
Fluorescence
Functional groups
Hydrogen bonding
Lysine
Metal-organic frameworks
NMR
Nuclear magnetic resonance
Photoluminescence
Porosity
Properties (attributes)
Sensitivity
Zirconium
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Summary:Recently, metal-organic frameworks (MOFs) have been extensively investigated as fluorescence chemsensors due to their tunable porosity, framework structure and photoluminescence properties. In this paper, a well-known Zr( iv )-based MOF, UiO-66-NH 2 was demonstrated to have capability for detection of l -lysine (Lys) and l -arginine (Arg) selectively from common essential amino acids in aqueous media via a fluorescence turn-on mechanism. Further investigation reveals its high sensitivity and strong anti-interference properties. Moreover, the possible mechanism for sensing Lys and Arg was explored by FT-IR and 1 H-NMR, and the results indicate that the enhancement of the fluorescence could be ascribed to the adsorption of Lys/Arg and the hydrogen bonding interactions between Lys/Arg and the amino group of UiO-66-NH 2 . The difference of the sensing capacity and sensitivity between UiO-66 and UiO-66-NH 2 revealed that the amino group plays an essential role in the sensing performance. This work presents a unique example of the functional group dependent sensing properties of MOFs. The amino group of UiO-66-NH 2 was demonstrated to play an important role in selective fluorescence turn-on sensing of lysine and arginine.
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra06879a