Issue 9, 2021

A multifunctional benzothiadiazole-based fluorescence sensor for Al3+, Cr3+ and Fe3+

Abstract

A new benzothiadiazole-based MOF {[Zn(BIBT)(oba)]·DMA}n (JXUST-3, BIBT = 4,7-bi(1H-imidazol-1-yl)benzo-[2,1,3]thiadiazole and H2oba = 4,4′-oxybisbenzoate) has been solvothermally synthesized and characterized by single crystal X-ray diffraction, IR spectroscopy and TGA. The fluorescence studies suggest that JXUST-3 could simultaneously selectively sense trivalent metal ions including Al3+, Cr3+ and Fe3+ by a turn-off effect, and the detection limits are 0.055, 0.049 and 0.056 μM, respectively. Moreover, JXUST-3 exhibits relatively good thermal and chemical stabilities and reusability. The fluorescent test paper also displayed an obvious turn-off effect, indicating that JXUST-3 can be used as a potential multi-response fluorescent probe. The possible quenching mechanisms of JXUST-3 for Al3+ and Fe3+ were competitive energy absorption, and for Cr3+ ions, they were competitive energy absorption and weak interactions between Cr3+ and the framework. Therefore, JXUST-3 could be viewed as a transition metal MOF fluorescence sensor for Al3+, Cr3+ and Fe3+ by the turn-off effect, simultaneously.

Graphical abstract: A multifunctional benzothiadiazole-based fluorescence sensor for Al3+, Cr3+ and Fe3+

Supplementary files

Article information

Article type
Paper
Submitted
13 1 2021
Accepted
27 1 2021
First published
27 1 2021

CrystEngComm, 2021,23, 1898-1905

A multifunctional benzothiadiazole-based fluorescence sensor for Al3+, Cr3+ and Fe3+

S. Yao, Y. Xiong, X. Tian, S. Liu, H. Xu, T. Zheng, J. Chen and H. Wen, CrystEngComm, 2021, 23, 1898 DOI: 10.1039/D1CE00060H

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