title: Eu(III)-functionalized MIL-124 as fluorescent probe for highly selectively sensing ions and organic small molecules especially for Fe(III) and Fe(II).
abstract: A layerlike MOF (MIL-124, orGa2(OH)4(C9O6H4)) has been prepared and chosen as a parent compound to encapsulate Eu(3+) cations by one uncoordinated carbonyl group in its pores. The Eu(3+)-incorporated sample (Eu(3+)@MIL-124) is fully characterized, which shows excellent luminescence and good fluorescence stability in water or other organic solvents. Subsequently, we choose Eu(3+)@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 Eu(3+)@MIL-124 was developed as a highly selective and sensitive probe for detection of Fe(3+) (detection limit, 0.28 μM) and Fe(2+) ions through fluorescence quenching of Eu(3+) and MOF over other metal ions. In connection to this, a probable sensing mechanism was also discussed in this paper. In addition, when Eu(3+)@MIL-124 was immersed in the different anions solutions and organic solvents, it also shows highly selective for Cr2O7(2-)(detection limit, 0.15 μM)and acetone. Remarkably, it is the first Eu-doped MOF to exhibit an excellent ability for the detection of Fe(3+) and Fe(2+) in an aqueous environment without any structural disintegration of the framework.
authors.affiliation: Department of Chemistry, Tongji University , Shanghai 200092, China.
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Xu
authors.forename: Bing
authors.initials: B
authors.lastname: Yan
mesh_terms: D000096:Acetone / Q000737:chemistry; D002412:Cations; D002857:Chromium / Q000737:chemistry; D005063:Europium / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D008670:Metals / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D002412:Cations; D005456:Fluorescent Dyes; D008024:Ligands; D008670:Metals; D009930:Organic Chemicals; D012997:Solvents; D014867:Water; D002857:Chromium; D000096:Acetone; D005063:Europium; D007501:Iron
keywords: Cr2O72− and acetone sensing; Eu3+@MIL-124; Fe3+ and Fe2+ sensing; aqueous environment; fluorescent probe; sensing mechanism