Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Photoluminescence and Molecular Structure of Tetrakis(N,N-dimethyldithiocarbamato)europate(III)
Takeshi KobayashiHaruo NarukeToshihiro Yamase
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1997 Volume 26 Issue 9 Pages 907-908

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Abstract

Photoexcitation of the sulfur(S)-to-europium(Eu) charge-transfer bands in Na[Eu(S2CNMe2)4]·3.5H2O at the low temperature (< 100 K) leads to the 5D07FJ (J = 0–4) luminescence of Eu3+ as a result of the energy transfer to the 5D0 state. The luminescence and excitation spectra reveal the dithiocarbamato-ligand phonon-assisted electronic transition involved in the small energy gap (∼1800 cm−1) between the 5D1 and 5D0 levels. The luminescence lifetime (0.11 ± 0.01 ms at 4.2 K) decreases with increasing temperature, probably due to the thermal crossover relaxation from 5D0 to the S→Eu charge transfer states.

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© 1997 The Chemical Society of Japan
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