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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.
Inorganic Chemistry 2017 April 4
A unique metal-organic complex (MOC) with formula [Eu2 (tpbpc)4 ·CO3 ·4H2 O]·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) (CrO4 2- /Cr2 O7 2- ) ions in aqueous solution. Importantly, the luminescence can be fast and simple, regenerated in detecting CrO4 2- and Cr2 O7 2- ions. Furthermore, the simple fluorescent-based test paper was successfully prepared and provided a reliable and visual detection of Cr3+ , CrO4 2- , and Cr2 O7 2- ions in daily applications.
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