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The effect of ligand symmetry on the ratiometric luminescence characteristics of lanthanides

Abstract

This work demonstrated that the ligand symmetry of europium(III) complexes controls the ratiometric luminescence characteristics of the lanthanide. Nona-coordinated europium(III) complexes having unsymmetrical β-diketonate ligands (CS) exhibit distinctive ratiometric spectral variations in the extremely narrow f-f transition bands over the temperature range 253 to 323 K. Conversely, no such ratiometric change can be observed in a series of nona-coordinated europium(III) complexes containing symmetrical β-diketonate ligands (C2V). The remarkable difference depending on the ligand symmetry (CS vs C2V) suugests that coordination rearrenegment of the β-diketonate in the complex causes the ratiometric spectral variations in the extremely narrow f-f transition bands, where two europium(III) complex isomers exist in the solution equilibrium. A self-calibration method using dual iso-emissive points is reported, where self-calibration using the two emission intensities at the iso-emissive points reduces the coefficient of variation in the luminensece thermometry.

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Publication details

The article was received on 08 Mar 2018, accepted on 12 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00898A
Citation: Dalton Trans., 2018, Accepted Manuscript
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    The effect of ligand symmetry on the ratiometric luminescence characteristics of lanthanides

    Y. Okayasu, H. Kamebuchi and J. Yuasa, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00898A

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