Europium and Terbium Benzene-1,2,4,5-Tetracarboxylates: Synthesis Peculiarities, Crystal Structures, and Luminescent Thermometry up to 400 °C

• Published in: Inorganic chemistry Vol. 63; no. 51; pp. 24096 - 24103
• Main Authors: Tcelykh, Liubov O., Goloveshkin, Alexander S., Rodina, Liubov S., Kolozhvari, Boris A., Latipov, Egor V., Kushnir, Sergey E., Utochnikova, Valentina V.
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 23.12.2024
• ISSN: 0020-1669; 1520-510X; 1520-510X
• DOI: 10.1021/acs.inorgchem.4c03253

In this study, we successfully obtained for the first time a luminescent organic-based thermometer that exhibits high reproducibility, stability, and functionality up to 400 °C. Our approach involved the selection of novel highly emissive and thermally stable MOFs KEu­(btec)­(H2O) and dehydrated KTb­(btec), btec = benzene-1,2,4,5-tetracarboxylate, along with the highly thermally stable copolyimide P84 = 80% methylphenylene-diamine + 20% methylene as the matrix; luminescence lifetime was selected as a temperature-dependent parameter due to its versatility in diverse environmental conditions. Synthesis peculiarities were studied for various lanthanide benzene-1,2,4,5-tetracarboxylates, and the crystal structures of KEu­(btec)­(H2O) and KTb­(btec) were determined by Rietveld refinement from powder X-ray diffraction data.