Issue 13, 2022

Lanthanide-MOFs as multifunctional luminescent sensors

Abstract

Five isostructural lanthanide metal–organic frameworks [Ln(BDPO)(H2O)4] (Ln = Eu for CUST-623, Tb for CUST-624, Gd for CUST-625, Dy for CUST-626, and Sm for CUST-627, BDPO = N,N′ bis(3,5-dicarboxyphenyl)-oxalamide) were synthesized by the solvothermal method. Single-crystal X-ray diffraction shows that Ln-MOFs manifest framework structures with two kinds of 1D open channels in the b-axis direction. Dual emission luminescent thermometer films were successfully prepared by immobilizing EuxTb0.02−x-BDPO into polyvinyl alcohol (PVA) aqueous solution, which features the integrity of MOF powders, proving their excellent processability. Moreover, Eu0.002Tb0.018-BDPO@PVA shows excellent temperature sensing performance with a high sensitivity of 3.7% K−1 in the temperature range of 303 K–423 K. CUST-623 and CUST-624 can be used as multiresponse fluorescent sensors for detecting Fe3+, Cr2O72−, CrO42− and TNP. In addition, the mechanism of fluorescence sensing is investigated by infrared (IR) spectroscopy, powder X-ray diffraction (PXRD) and ultraviolet–visible (UV-vis) spectroscopy. This work provides a general method for constructing Ln-MOF sensor materials with multifunctional luminescence characteristics.

Graphical abstract: Lanthanide-MOFs as multifunctional luminescent sensors

Supplementary files

Article information

Article type
Research Article
Submitted
30 мар 2022
Accepted
08 май 2022
First published
10 май 2022

Inorg. Chem. Front., 2022,9, 3259-3266

Lanthanide-MOFs as multifunctional luminescent sensors

S. Wang, B. Sun, Z. Su, G. Hong, X. Li, Y. Liu, Q. Pan and J. Sun, Inorg. Chem. Front., 2022, 9, 3259 DOI: 10.1039/D2QI00682K

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