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Ultrastable 1D Europium Complex for Simultaneous and Quantitative Sensing of Cr(III) and Cr(VI) Ions in Aqueous Solution with High Selectivity and Sensitivity

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posted on 2017-03-20, 14:48 authored by Jingjuan Liu, Guanfeng Ji, Jiannan Xiao, Zhiliang Liu
A unique metal–organic complex (MOC) with formula [Eu2(tpbpc)4·CO3·4H2O]·DMF·solvent (Htpbpc = 4′-[4,2′;6′,4″]-terpyridin-4′-yl-biphenyl-4-carboxylic acid) has been successfully constructed under solvothermal conditions. The Eu complex, as proved by structural analysis, exhibits a fascinating 1D linear-type chain structure which is further extended to a 3D H-bonded supramolecular framework. The luminescent investigations confirm that the emission behavior of the Eu complex possesses excellent water stability and pH stability, and it is the first example of a MOC-based fluorescent probe with high selectivity, high sensitivity, and low detection limit, targeting Cr­(III) and Cr­(VI) (CrO42–/Cr2O72–) ions in aqueous solution. Importantly, the luminescence can be fast and simple, regenerated in detecting CrO42– and Cr2O72– ions. Furthermore, the simple fluorescent-based test paper was successfully prepared and provided a reliable and visual detection of Cr3+, CrO42–, and Cr2O72– ions in daily applications.

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