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Lanthanide-Functionalized Metal−Organic Framework as Ratiometric Probe for Selective Detection of 4-NA and Fe3+

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Abstract

Luminescent MOFs with dual or multiple emission centers can act as multi-target and self-calibrating probes to selectively detect environment pollutants with high precision. In this paper, we synthesized Ln3+@Zn-MOF (Ln3+ = Eu3+ and Tb3+) with dual emission characteristics by post-encapsulation Ln3+ ions into Zn-MOF. The fluorescence sensing experiments show that Eu3+@Zn-MOF can be used as a multi-functional and self-calibrating probe to selectively detect 4-nitroaniline (4-NA) and Fe3+ ions with high sensitivity, good anti-interference and repeatability. The LOD is 6.01 μM and 60.99 μM for 4-NA and Fe3+ ions, respectively. Compared to the pristine Zn-MOF, Eu3+@Zn-MOF exhibits the higher sensitivity and accuracy in detection application. Further studies on UV–vis adsorption spectra show that the possible fluorescence quenching mechanism are the competitive absorption of excitation light between MOF and the analytes. And this work presents a promising strategy to prepare dual emissions probes for effective detection of environment pollutants.

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Acknowledgements

This project is supported by NSF of Tianjin (No. 18JCYBJC89100).

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Funding was provided by Natural Science Foundation of Tianjin City (Grant No.: 18JCYBJC89100)

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Correspondence to Fengqin Wang or Xiaoqing Wang.

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10904_2022_2323_MOESM1_ESM.docx

Supplementary file1 FT-IR spectra and PXRD patterns of Ln3+@Zn-MOF and Zn-MOF (Fig. S1); SEMimages and corresponding element contents (Fig. S2); Emission spectra in differentorganic solvents (Fig. S3); Fluorescence titration with the addition of different volumesof 4-NA (Fig. S4); IR spectra and PXRD patterns before and after cycle of Eu3+@Zn-MOF (Fig. S5); Fluorescence titration of with the addition of different volumes of Fe3+(Fig. S6); The UV-vis absorption spectra and different kind of nitroaromatic compoundsand cations (Fig. S7). (DOCX 7564 kb)

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Sun, Z., Li, Y., Liu, J. et al. Lanthanide-Functionalized Metal−Organic Framework as Ratiometric Probe for Selective Detection of 4-NA and Fe3+. J Inorg Organomet Polym 32, 2953–2960 (2022). https://doi.org/10.1007/s10904-022-02323-y

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  • DOI: https://doi.org/10.1007/s10904-022-02323-y

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