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Updated: Dec 25, 2025
High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
Published on: April 16, 2017
A Europium(III) Complex with an Unusual Anion-Cation Interaction: A Luminescent Molecular Thermometer for Ratiometric
Mani Outis1, César A T Laia1, M Conceição Oliveira2
1LAQV-REQUIMTE Departamento de Química, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal.
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.
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