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

• Published in: CrystEngComm Vol. 23; no. 9; pp. 1898 - 1905
• Main Authors: Shu-Li, Yao, Yu-Chen, Xiong, Xue-Mei Tian, Sui-Jun, Liu, Xu, Hui, Teng-Fei, Zheng, Jing-Lin, Chen, He-Rui, Wen
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 01.01.2021
• Subjects: Absorption spectra; Aluminum; Chromaticity; Crystallography; Energy absorption; Ferric ions; Fluorescent indicators; Format; Infrared spectroscopy; Metal-organic frameworks; Single crystals; Spectrum analysis; Thiadiazoles; Transition metals; Trivalent chromium; X ray photoelectron spectroscopy
• ISSN: 1466-8033
• DOI: 10.1039/d1ce00060h

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.