Abstract
One novel Yb-MOF, namely, {[Yb(Hdpc)(bibp)(H2O)]·(H2O)}n (Ⅰ) (H4dpc = 2-(3′,4′-dicarboxylphenoxy) isophthalic acid, bibp = 4,4'-bis(imidazolyl)) biphenyl, has been assembled under hydrothermal condition, its structure and physicochemical properties have been characterized and investigated. Structural analysis shows that it is triclinic crystal system and Pī space group. Ⅰ exhibits characteristic fluorescence emission (λem = 368 nm) both in solid-state and water under excitation of 324 nm. Furthermore, its acid-base resistance property and thermodynamic stability have been verified by PXRD and thermogravimetric analyses. Real-time fluorescence quenching performances of Ⅰ have been investigated in the detection of Nitrobenzene, Fe3+ and Cr2O72– with high sensitivity, selectivity, efficiency and recyclability. In addition, the mechanisms of fluorescence quenching have been systematically studied by ICP-AES (inductively coupled plasma-atomic emission spectrometer), XPS (X-ray photoelectron spectroscopy) analyses, PXRD analysis, UV–vis spectra and SEM mapping (scanning electron microscope) or DFT (density functional theory).
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