Turn-On Luminescent Sensor toward Fe, Cr, and Al Based on a Co(II) Metal-Organic Framework with Open Functional Sites.

A novel Co-based metal-organic framework (MOF) with the formula of {[Co(BIBT)(BTC)(HO)]·solvents} (, where denotes Jiangxi University of Science and Technology, BIBT = 4,7-bi(1-imidazol-1-yl)benzo-[2,1,3]thiadiazole, and HBTC = 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 could be considered as a multifunctional fluorescence sensor toward Fe, Cr, and Al 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 could be ascribed to an absorbance caused enhancement (ACE) mechanism. Notably, is the first turn-on MOF fluorescent sensor for Fe, Cr, and Al simultaneously.