Amino group dependent sensing properties of metal–organic frameworks: selective turn-on fluorescence detection of lysine and arginine. Issue 61 (9th October 2020)

• Record Type: Journal Article
• Authors: Dong, Jing; Zhang, Xiu-Du; Xie, Xia-Fei; Guo, Fan; Sun, Wei-Yin
• Is Part Of: RSC advances. Volume 10:Issue 61(2020)
• Page Start: 37449
• Page End: 37455
• Publication Date: 2020-10-09
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra06879a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The amino group of UiO-66-NH2 was demonstrated to play an important role in selective fluorescence turn-on sensing of lysine and arginine. Abstract : 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-NH2 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-NH2 . The difference of the sensing capacity and sensitivity between UiO-66 and UiO-66-NH2 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.