A Europium(III) Complex with an Unusual Anion–Cation Interaction: A Luminescent Molecular Thermometer for Ratiometric Temperature Sensing

Mani Outis, César A. T. Laia, M. Conceição Oliveira, Bernardo Monteiro, Cláudia C. L. Pereira

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)580-586
Number of pages7
JournalCHEMPLUSCHEM
Volume85
Issue number3
DOIs
Publication statusPublished - 1 Mar 2020

Keywords

  • Lanthanides
  • luminescence
  • molecular thermometers
  • sensors
  • thermochromic behavior

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