Use of Electrospray Mass Spectrometry (ESI-MS) for the Study of
Europium(III) Complexation with Bis(dialkyltriazinyl)pyridines and Its
Implications in the Design of New Extracting Agents
Sonia Colette
Badia Amekraz
Charles Madic
Laurence Berthon
Gérard Cote
Christophe Moulin
10.1021/ic025637t.s001
https://acs.figshare.com/articles/journal_contribution/Use_of_Electrospray_Mass_Spectrometry_ESI-MS_for_the_Study_of_Europium_III_Complexation_with_Bis_dialkyltriazinyl_pyridines_and_Its_Implications_in_the_Design_of_New_Extracting_Agents/3607536
ESI mass spectrometry was used to investigate the europium complexation by tridentate ligands L ≡ 2,6-bis(5,6-dialkyl-1,2,4-triazin-3-yl)-pyridines (DATP) that have shown unique separation properties of actinides(III) from
lanthanides(III) in nitric acid solutions. Complexes of three ligands, namely methyl (DMTP), <i>n</i>-propyl (DnPTP), and
<i>iso</i>-propyl (DiPTP), have been investigated in acidic solutions to check the aqueous-phase stability of Eu(L)<sub>3</sub><sup>3+</sup> ions
identified previously in the solid state. The data obtained show, first, the presence of stable Eu(L)<sub>3</sub><sup>3+</sup> ions with
DnPTP (log β<sub>3</sub><sup>app</sup> = 12.0 ± 0.5) and DiPTP (log β<sub>3</sub><sup>app</sup> = 14.0 ± 0.6) in methanol/water (1:1 v/v) solutions under
pH range 2.8−4.6 and, second, a mechanism whereby alkyl moieties contribute to a self-assembling process
leading to the formation of Eu(L)<sub>3</sub><sup>3+</sup> ions. Other complexes such as Eu(L)<sub>2</sub><sup>3+</sup> ions are only observed for DnPTP (log
β<sub>2</sub><sup>app</sup> = 6.7 ± 0.5) and DMTP (log β<sub>2</sub><sup>app</sup> = 6.3 ± 0.1) and Eu(L)<sup>3+</sup> only for DMTP (log β<sub>1</sub><sup>app</sup> = 2.9 ± 0.2). The log
β<i><sub>n</sub></i><sup>app</sup> values for the Eu(L)<i><sub>n</sub></i><sup>3+</sup> (<i>n</i> = 1−3) complexes were determined at pH 2.8. Better insight was given in this
study concerning the role of the hydrophobic exterior of the ligands for the design of a new range of extracting
agents.
2002-12-02 00:00:00
pH 2.8. Better insight
separation properties
ligand
europium complexation
New Extracting Agents ESI mass spectrometry
log β 2 app
log β 3 app
Eu
log β 1 app
Other complexes
DATP
alkyl moieties
acidic solutions
nitric acid solutions
DnPTP
log β n app values
DMTP
Electrospray Mass Spectrometry