Investigation of the Sensing Properties of Lanthanoid Metal–Organic Frameworks (Ln-MOFs) with Terephthalic Acid
The solvothermal synthesis of LnCl<sub>3</sub><sup>.</sup>nH<sub>2</sub>O with terephthalic acid (benzene-1,4-dicarboxylic acid, H<sub>2</sub>BDC) produced metal-organic frameworks (LnBDC), [Ln<sub>2</sub>(BDC)<sub>3</sub>(H<sub>2</sub>O)<sub>4</sub>]<sub>∞</sub>, where Ln = Sm, Eu, Tb, and Dy. The materials obtained were characterized by a number of physico-chemical techniques. The influence of the ionic radius of the lanthanides on the microstructural characteristics of the Ln-MOFs was evaluated by performing Rietveld refinement. The MOFs obtained were tested as fluorescent sensors for numerous cations and anions in water. The highly luminescent EuBDC and TbBDC demonstrated multi-responsive luminescence sensing functions to detect Ag(I), Fe(III), Cr(III), and Cr(VI), which are essential for their environmental applications. By applying the non-linear Stern-Volmer equation, the fluorescent quenching mechanism was determined. The stability of the obtained materials in water in a wide pH range (acidity pH = 4 and alkalinity pH = 9 solutions) was confirmed.
Authors
- Martin Tsvetkov (ORCID: https://orcid.org/0000-0003-2917-5376)
- D. Todorovsky (ORCID: https://orcid.org/0000-0002-5274-7152)
- Bernd Morgenstern (ORCID: https://orcid.org/0000-0002-8360-4218)
- Maria Milanova
- Denitsa Elenkova
- Yana Dimitrova (ORCID: https://orcid.org/0000-0003-1411-9937)
- Joana Zaharieva (ORCID: https://orcid.org/0009-0007-7794-1377)
Institutions
- Sofia University "St. Kliment Ohridski" (BG)
- Saarland University (DE)
Publication Details
- Journal
- Molecules
- Published
- 2024-08-05
- DOI
- https://doi.org/10.3390/molecules29153713
- Citations
- 12
- Primary Topic
- Metal-Organic Frameworks: Synthesis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.90