Highly photoluminescent Eu(III) complexes of the new 1-triphenylen-2-yl-3-trifluoroacetylacetone

Ternary Eu(III) complex involving two 1,3-diketonate ligands, nitrate anion and two tri-n-octyl phosphinoxide co-ligands, and its photoluminescence spectrum. [Display omitted] ► Tri-n-octylphosphine oxide as auxiliary ligand enhances the photoluminescence quantum yield 3-, 6-fold of the Eu(III) comp...

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Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2012-12, Vol.250, p.85-91
Main Authors: Pietraszkiewicz, Oksana, Mal, Suraj, Pietraszkiewicz, Marek, Maciejczyk, Michał, Czerski, Igor, Borowiak, Teresa, Dutkiewicz, Grzegorz, Drobchak, Oksana, Penninck, Lieven, Beeckman, Jeroen, Neyts, Kristiaan
Format: Article
Language:English
Subjects:
1,3-Diketonate
Europium complexes
Liquid crystals
Luminescence
Quantum yield
Triphenylene
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Summary:Ternary Eu(III) complex involving two 1,3-diketonate ligands, nitrate anion and two tri-n-octyl phosphinoxide co-ligands, and its photoluminescence spectrum. [Display omitted] ► Tri-n-octylphosphine oxide as auxiliary ligand enhances the photoluminescence quantum yield 3-, 6-fold of the Eu(III) complex. ► The orientation of triphenylene unit is parallel to the long axis of the nematic phase. ► Nematic phases appended with Eu(III) complexes are luminescent. The new triphenylene 1,3-diketone (1-triphenylen-2-yl-3-trifluoroacetylacetone (TphTA)) and its europium complexes were synthesized. The preliminary data on photophysical properties of Eu(TphTA)3(H2O)(C2H5OH) (1), Eu(TphTA)3(TOPO)(H2O) (2), Eu(TphTA)3(TOPO)2 (3) and Eu(TphTA)2NO3(TOPO)2 (4) are reported. Addition of a tri-n-octylphosphine oxide (TOPO) co-ligand to the europium diketonate complex removes water molecules from the coordination sphere, that leads to a significant increase of the photoluminescence quantum yield. The behavior of complexes 3 and 4 in nematic liquid crystal was investigated.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2012.10.003