Luminescence and potentiometric studies on the complexation of europium(III) by picolinate in an aqueous solution

水溶液中におけるユウロピウム(III)のピコリン酸による錯形成反応に関する発光及び滴定による研究

Aoyagi, Noboru; Toraishi, Takashi*; Nagasaki, Shinya*; Tanaka, Satoru*

The complexation behavior of Eu $^{3+}$ aquo ions by picolinic acid in aqueous solutions is investigated so as to describe the formation of poly nuclear complexes which are uncommon for trivalent lanthanides. Potentiometric titration exhibited that no poly-nuclear complexes form via hydroxide bridges even at high pH, providing a monomeric form, [Eu(Pic) $_{4}$ (H $_{2}$ O)] $^{-}$ , with picolinate ligand in a large excess. In addition, the lifetime analysis of Eu $^{3+}$ luminescence in time-resolved laser-induced fluorescence spectroscopy was performed under the condition where Eu(pic) $^{2+}$ appears as the secondary dominant species. The result showed the strong quenching of luminescence, suggesting the polymeric complexes, [Eu(Pic)] $_{m}$ $^{2m+}$ , form even at low pH due to the vicinal Eu-Eu interaction.

使用言語	:	English
掲載資料名	:	Journal of Applied Solution Chemistry and Modeling
巻	:	1
号	:	2
ページ数	:	p.148 - 155
発行年月	:	2012/12
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論文URL	:	https://doi.org/10.6000/1929-5030.2012.01.02.11
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使用施設	:	第4研究棟
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登録番号 : AA20120851
抄録集掲載番号 : 41000293
論文投稿番号 : 11912

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