Turn-On Luminescent Sensor toward Fe3+, Cr3+, and Al3+ Based on a Co(II) Metal–Organic Framework with Open Functional Sites

• Published in: Inorganic chemistry Vol. 59; no. 5; pp. 2803 - 2810
• Main Authors: Tian, Xue-Mei, Yao, Shu-Li, Qiu, Cheng-Qiang, Zheng, Teng-Fei, Chen, Yong-Qiang, Huang, Haiping, Chen, Jing-Lin, Liu, Sui-Jun, Wen, He-Rui
• Format: Journal Article
• Language: English
• Published: American Chemical Society 02.03.2020
• ISSN: 0020-1669; 1520-510X; 1520-510X
• DOI: 10.1021/acs.inorgchem.9b03152

A novel Co-based metal–organic framework (MOF) with the formula of {[Co3(BIBT)3(BTC)2(H2O)2]·solvents} n (JXUST-2, where JXUST denotes Jiangxi University of Science and Technology, BIBT = 4,7-bi­(1H-imidazol-1-yl)­benzo-[2,1,3]­thiadiazole, and H3BTC = 1,3,5-benzenetricarboxylic acid) has been solvothermally prepared, which takes 3D structure with a rare 3,4,6-c topology and contains intramolecular hydrogen bonds. Interestingly, the sensing investigations suggest that JXUST-2 could be considered as a multifunctional fluorescence sensor toward Fe3+, Cr3+, and Al3+ via a turn-on effect with good reusability and detection limits of 0.13, 0.10, and 0.10 μM, respectively. The turn-on effect of JXUST-2 could be ascribed to an absorbance caused enhancement (ACE) mechanism. Notably, JXUST-2 is the first turn-on MOF fluorescent sensor for Fe3+, Cr3+, and Al3+ simultaneously.