title: Charge-transfer-based terbium MOF nanoparticles as fluorescent pH sensor for extreme acidity.
abstract: Newly emerged metal organic frameworks (MOFs) have aroused the great interest in designing functional materials by means of its flexible structure and component. In this study, we used lanthanide Tb3+ions and small molecular ligands to design and assemble a kind of pH-sensitive MOF nanoparticle based on intramolecular-charge-transfer effect. This kind of made-to-order MOF nanoparticle for H+is highly specific and sensitive and could be used to fluorescently indicate pH value of strong acidic solution via preset mechanism through luminescence of Tb3+. The long luminescence lifetime of Tb3+allows eliminating concomitant non-specific fluorescence by time-revised fluorescence techniques, processing an advantage in sensing H+in biological media with strong autofluorescence. Our method showed a great potential of MOF structures in designing and constructing sensitive sensing materials for specific analytes directly via the assembly of functional ions/ligands.
authors: State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096 PR China.
authors: Zewan
authors: Z
authors: Qi
authors: State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096 PR China. Electronic address: yc@seu.edu.cn.
authors: Yang
authors: Y
authors: Chen
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D005456:Fluorescent Dyes / Q000737:chemistry*; D005750:Gastric Juice / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009942:Organometallic Compounds / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods; D013725:Terbium / Q000737:chemistry*
chemical_list: D005456:Fluorescent Dyes; D009942:Organometallic Compounds; D013725:Terbium
keywords: Charge-transfer; Fluorescence; MOF nanoparticles; Terbium; pH sensor