Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
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Enhancement of the Luminescence Efficiency of Europium(III) Tris(β-diketonato) Complex in Organic Media by Quaternary Ammonium Salts with Anionic Ligands
Hajime KATANOKohei UEMATSUToshihide TSUKATANI
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2011 Volume 27 Issue 12 Pages 1249

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Abstract

Benzyldimethyltetradecylammonium (BA14+) salts with anionic ligands (X), such as bis(2-ethylhexyl)sulfosuccinate, bis(2-ethylhexyl)phosphate (BEHP), and benzotriazole (BTA) anions, were prepared. These salts were soluble in various organic solvents. The luminescence emission spectra of organic solutions of a red luminescent, tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octadionato)europium(III) complex in the presence of the BA14X’s were recorded. The emission intensity of the Eu(III) complex was increased remarkably by the addition of BA14X (X = BEHP and BTA). This effect can be attributed to the formation of 1:1 X-adducts of the Eu(III) complex, in which the asymmetry of the ligand field is increased so as to enhance the emission efficiency of the 5D05F2 transition. The enhancement effect by BA14X was higher than that of charge-neutral ligands, such as tri-n-octylphosphine oxide and 1,10-phenanthroline, which have been used as second ligands to enhance the emission efficiency of tris(β-diketonato)europium(III) complexes.

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© 2011 by The Japan Society for Analytical Chemistry
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