Turn-On Luminescent Sensor toward Fe<sup>3+</sup>, Cr<sup>3+</sup>, and Al<sup>3+</sup> Based on a Co(II) Metal–Organic Framework with Open Functional Sites
Xue‐Mei Tian, Shu‐Li Yao, Cheng-Qiang Qiu, Teng‐Fei Zheng, Yong‐Qiang Chen, Haiping Huang, Jing‐Lin Chen, Sui‐Jun Liu, He‐Rui Wen
Abstract
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.