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

Dalton Trans

Department of Applied Chemistry, Tokyo University of Science, Kagurazaka, shinjuku-ku, Tokyo 162-8601, Japan.

Published: May 2018

This work demonstrated that the ligand symmetry of europium(iii) complexes controls the ratiometric luminescence characteristics of lanthanides. 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 from 253 to 323 K. In contrast, 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 (Csvs. C2v) suggests that the coordination rearrangement of β-diketonate in the complex causes ratiometric spectral variations in 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 luminescence thermometry.

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Source
http://dx.doi.org/10.1039/c8dt00898aDOI Listing

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