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Study of GUPT-2, a Water-Stable Zinc-based Metal–Organic Framework as a Highly Selective and Sensitive Fluorescence Sensor in the Detection of Al3+ and Fe3+ Ions

Abstract

A novel luminescent Zn(II)-based metal–organic framework with twofold interpenetrating [Zn(DHT)(BPP)]n (GUPT-2) {GUPT = Guangdong University of Petrochemical Technology, H2DHT = 2,5- dihydroxyterephthalic acid, and BPP = 1,3-di(4-pyridyl)propane} was successfully synthesized using the solvothermal method, which displayed a double-interleaved 2D framework. GUPT-2 not only revealed excellent stability in water and multiple organic solvents but also retained its structural integrity under pH values in the ranges of 3–11. According to electronic structure calculations, electronic transitions in GUPT-2 were governed by the ligand-to-ligand charge transfer (LLCT) mechanism. GUPT-2 exhibited significant luminescence and selectively detected Fe3+ and Al3+ ions, with limit of detection (LOD) values 0.446 and 0.269 µM, respectively. The lower LOD values for Fe3+ and Al3+ of GUPT-2 are excellent compared with most of the reported MOF-based sensors. It is interesting to note that GUPT-2 revealed a prominent luminescent color change from faint yellow to bright green under UV irradiation at 360 nm, with an enhancement in the detection of Al3+ ions. More importantly, the fluorescence enhancement (turn on) and blue shift effects on Al3+ were obvious even in the presence of other interfering ions. These excellent fluorescent properties make GUPT-2 a rare selective luminescence probe in the detection of Fe3+ and Al3+ ions in pure water systems.

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Supplementary files

Article information


Submitted
07 Mar 2021
Accepted
01 May 2021
First published
04 May 2021

CrystEngComm, 2021, Accepted Manuscript
Article type
Paper

Study of GUPT-2, a Water-Stable Zinc-based Metal–Organic Framework as a Highly Selective and Sensitive Fluorescence Sensor in the Detection of Al3+ and Fe3+ Ions

S. wang, X. Zheng, S. Zhang, G. Li and Y. Xiao, CrystEngComm, 2021, Accepted Manuscript , DOI: 10.1039/D1CE00323B

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