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A Robust Luminescent Tb(III)-MOF with Lewis Basic Pyridyl Sites for the Highly Sensitive Detection of Metal Ions and Small Molecules

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posted on 2016-03-11, 14:48 authored by Jun Zhao, Ye-Nan Wang, Wen-Wen Dong, Ya-Pan Wu, Dong-Sheng Li, Qi-Chun Zhang
A new luminescent terbium–metal–organic framework [Tb3(L)2(HCOO)­(H2O)5]·DMF·4H2O (1) (H4L = 4,4′-(pyridine-3,5-diyl)­diisophthalic acid) has been successfully assembled by Tb3+ ions and an undeveloped pyridyl-tetracarboxylate. Compound 1 exhibits a 3D porous (3,8)-connected (4.52)2(42.512.66.75.83) topological framework with fascinating 1D open hydrophilic channels decorated by uncoordinated Lewis basic pyridyl nitrogen atoms. In particular, the Tb-MOF (1) can detect Cu2+ ions with high selectivity and sensitivity, and its luminescence is nearly entirely quenched in N,N-dimethylformamide (DMF) solution and biological system. In addition, 1 still has high detection for the trace content of nitromethane with 70 ppm, which suggests that 1 is a promising example of dual functional materials with sensing copper ions and nitromethane.