Ultrastable 1D
Europium Complex for Simultaneous and Quantitative Sensing of Cr(III)
and Cr(VI) Ions in Aqueous Solution with High Selectivity and Sensitivity
posted on 2017-03-20, 14:48authored byJingjuan 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.