Dual-Function Metal-Organic Framework as Efficient Turn-Off Sensor for Water and Unusual Turn-On Sensor for Ag+


Fluorescent sensors have been extensively employed in efficient energy utilization and environment protection. In this work, an amino-decorated metal-organic framework [Cd(3-NH2-pba)(2)](4).8DMF (3-NH2-Hpba = 3-amino-4-(pyridin-4-yl)benzoic acid) was synthesized as a dual-function fluorescent sensor through the distinctive interaction of amino moieties with analytes. This compound exhibits highly sensitive turn-off sensing of trace water in ethanol with a detection limit to 0.09%, much below the required values for hydrated ethyl alcohol fuel internationally. Meanwhile, it can also be developed as an unusual turn-on sensor for the probe of Ag+ in aqueous solution with the detection limit to 0.44 mu M, lower than the maximum concentration of Ag+ in drinking water according to the standard of the U.S. Environmental Protection Agency. It is the first example of MOF-based fluorescent sensor for simultaneously detecting trace water and Ag+.



subject category

Chemistry, Multidisciplinary; Crystallography; Materials Science, Multidisciplinary


Zhou, T; Liu, S; Guo, XM; Wang, Q; Fu, LS; Mi, SY; Gao, P; Su, QJ; Guo, HD

our authors


This work was supported by the National Natural Science Foundation of China (No. 21601019), Science Foundation of Departmen t o f E d u c a t i o n of J i l i n P ro v inc e (JJKH20210875KJ), and Natural Science Foundation of Changchun Normal Univ e r s ity (cscxy2017010, cscxy2018011). This work was also developed within the scope of the projects CICECO-Aveiro Institute of Materials, UIDB/50011/2020 and UIDP/50011/2020 financed by national funds through the Portuguese Foundation for Science and Technology/MCTES.

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