期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 1, 页码 721-729出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5070409
关键词
Eu3+@MIL-124; fluorescent probe; Fe3+ and Fe2+ sensing; sensing mechanism; aqueous environment; Cr2O72- and acetone sensing
资金
- National Natural Science Foundation of China [20971100, 91122003]
- Tongji University
A layerlike MOF (MIL-124, orGa(2)(OH)(4)(C9O6H4)) has been prepared and chosen as a parent compound to encapsulate Eu3+ cations by one uncoordinated carbonyl group in its pores. The Eu3+-incorporated sample (Eu3+@MIL-124) is fully characterized, which shows excellent luminescence and good fluorescence stability in water or other organic solvents. Subsequently, we choose Eu3+@MIL-124 as sensitive probe for sensing metal ions, anions, and organic small molecules because of its robust framework. Studying of the luminescence properties reveals that the complex Eu3+@MIL-124 was developed as a highly selective and sensitive probe for detection of Fe3+ (detection limit, 0.28 mu M) and Fe2+ ions through fluorescence quenching of Eu3+ and MOF over other metal ions. In connection to this, a probable sensing mechanism was also discussed in this paper. In addition, when Eu3+@MIL-124 was immersed in the different anions solutions and organic solvents, it also shows highly selective for Cr2O72-(detection limit, 0.15 mu M)and acetone. Remarkably, it is the first Eu-doped MOF to exhibit an excellent ability for the detection of Fe3+ and Fe2+ in an aqueous environment without any structural disintegration of the framework.
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