Luminescence and Potentiometric Studies on the Complexation of Europium(III) by Picolinate in an Aqueous Solution
DOI:
https://doi.org/10.6000/1929-5030.2012.01.02.11Keywords:
Eu3 complex, picolinic acid, polynuclear complex, TRLFSAbstract
The complexation of Eu3+ aquo ions by picolinic acid in an aqueous solution was investigated to describe the formation of polynuclear complexes that are uncommon for trivalent lanthanides. Potentiometric titration indicated that no polynuclear complexes formed via hydroxide bridges, even at high pH, and that the monomeric form [Eu(Pic)4_(H2O)] was present when a large excess of a picolinate ligand was used. In addition, lifetime analysis of Eu3+ luminescence via time-resolved laser-induced fluorescence spectroscopy was performed under conditions where Eu(pic)2+ appears as the secondary dominant species. Strong quenching of the luminescence was detected, suggesting that polymeric complexes ([Eu(Pic)]m2m+) form, even at low pH, owing to a vicinal Eu-Eu interaction.
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Published
2012-12-31
How to Cite
Aoyagi, N., Toraishi, T., Nagasaki, S., & Tanaka, S. (2012). Luminescence and Potentiometric Studies on the Complexation of Europium(III) by Picolinate in an Aqueous Solution. Journal of Applied Solution Chemistry and Modeling, 1(2), 148–155. https://doi.org/10.6000/1929-5030.2012.01.02.11
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