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 3 2022
Accepted
08 5 2022
First published
10 5 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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