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A Europium(III) Complex with an Unusual Anion–Cation Interaction: A Luminescent Molecular Thermometer for Ratiometric Temperature Sensing
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Orientador(es)
Resumo(s)
An unusual thermally sensitive anion–cation interaction, which is characteristic of the anion [Eu(FOD)4]−, occurs in the complex [CHOL][Eu(FOD)4] (1; CHOL=choline; FOD=1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionate) and affects both quantum yield and thermochromic behavior. This prompted the design of an Eu3+-based ratiometric thermometer that functions at temperatures up to 95 °C through a thermally excited state absorption of the Eu3+ ion. The reusable temperature-sensitive luminescent complex showed a range of relative sensitivity between 0.45 % C−1 at 25 °C, with an increase to 7.0 % C−1 at 95 °C. Confinement of compound 1 in a transparent film of polysulfone resulted in a higher thermal stability of 1 while its luminescence showed a strong temperature dependence.
Descrição
This work was supported by the Associated Laboratory for Sustainable Chemistry‐Clean Processes and Technologies – LAQV which is financed by national funds from FCT/MEC (UID/QUI/50006/2019) and co‐financed by the ERDF under the PT2020 Partnership Agreement (POCI‐01‐0145‐FEDER – 007265) The NMR spectrometers are part of The National NMR Facility, supported by Fundação para a Ciência e a Tecnologia (RECI/BBB‐BQB/0230/2012). We also thank to RNEM – Portuguese Mass Spectrometry Network, ref. LISBOA‐01‐0145‐FEDER‐022125, supported by FCT and Lisboa Regional Operational Programme (Lisboa2020). This work has been supported by Fundação para a Ciência e a Tecnologia through the contract n° IST‐ID/077/2018 (Bernardo Monteiro), SFRH/BD/120985/2016 (Mani Outis). Cláudia C. L. Pereira thanks to Fundação para a Ciência e a Tecnologia, MCTES, for the Norma transitória DL 57/2016 Program Contract.
Palavras-chave
Lanthanides luminescence molecular thermometers sensors thermochromic behavior General Chemistry