Ac erium(III) thiocyanate complex shows brightblue emission at approximately 450 nm in acetonitrile, the quantumy ield of which reaches more than 40 %a t2 98 K. Non-coordinating solvents such as acetonitrile give blue emission whereas oxygen-coordinatinga nd nitrogen-coordinatings olvents afford near UV and green emissions, respectively.Supporting information and the ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.Figure 3. Emission spectra of the Ce III complex, composed of Ce(OTf) 3 and nBu 4 NSCN (1:3 molar ratio), in the representatives olvents; methanol (red, l ex = 267 nm), chloroform (cyan, l ex = 333 nm),t etrahydrofuran (yellow, l ex = 343 nm), acetonitrile (black, l ex = 365 nm), toluene (purple, l ex = 365 nm), and pyridine (green, l ex = 365 nm).Figure 4. Plots of the emissionpeak against donor number in severals olvents;non-coordinating solvents (blue), oxygen-coordinatings olvents (purple), nitrogen-coordinating solvents (green), chloroform (1), acetonitrile (2), 2,6-dimethylpyridine (3), 2,4,6-trimethylpyridine (4).
We found that Ce(III) ion is oxidized to form Ce(IV) ion on a quartz cell in air-saturated organic solvents, causing a strong absorption that overlaps with the absorption of the Ce(III) complex. Due to the strong absorption, the emission quantum yield (Φ em ) of the luminescent Ce(III) complex was under-estimated. A silane treatment on the quartz cell, which prevents the formation of the Ce(IV) species even in air, and titration experiments under an Ar atmosphere enabled correct evaluation of the luminescent properties where the Φ em of an electrically neutral Ce(SCN) 3 reached 91 % in acetonitrile.
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