Optical Temperature Sensors Based On Europium(III) Beta‐Diketonate Complexes Chemically Bonded To Functionalized Polydimethylsiloxane

Abstract

AbstractNew luminescent temperature probes were synthesized based on the dispersion of the europium(III) [Eu(tta)3(H2O)2] complex (tta=thenoyltrifluoroacetonate), and the covalent bond of europium(III) [Eu(tta)3(adppo)(H2O)] and [Eu(tta)3(adppo)2] (adppo=allyldiphenylphosphine oxide) complexes by the hydroslylilation reaction between the allyl group and the hydride terminal polydimethylsiloxane (PDMS). Phosphine oxide coordination to the europium(III) ion increases the lifetime values and changes the emission profile to a more symmetrical europium(III) chemical environment. The membranes shows a decrease in lifetime values with the increase of temperature, and the dynamic range of the luminescent membranes shifts to higher temperatures by successive substitution of water molecules for the phosphine oxide ligand. Sensitivities of 6.76, 7.80 and 8.35 μS C−1 were obtained for the membranes containing the [Eu(tta)3(H2O)2], [Eu(tta)3(adppo)(H2O)] and [Eu(tta)3(adppo)2] complexes, respectively. Low oxygen cross sensitivity are observable in the membranes containing the coordinated adppo molecule, allowing their use in multiparametric sensors.