TY - DATA T1 - 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 PY - 2002/12/02 AU - Sonia Colette AU - Badia Amekraz AU - Charles Madic AU - Laurence Berthon AU - Gérard Cote AU - Christophe Moulin UR - 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 DO - 10.1021/ic025637t.s001 L4 - https://ndownloader.figshare.com/files/5695659 KW - pH 2.8. Better insight KW - separation properties KW - ligand KW - europium complexation KW - New Extracting Agents ESI mass spectrometry KW - log β 2 app KW - log β 3 app KW - Eu KW - log β 1 app KW - Other complexes KW - DATP KW - alkyl moieties KW - acidic solutions KW - nitric acid solutions KW - DnPTP KW - log β n app values KW - DMTP KW - Electrospray Mass Spectrometry N2 - 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), n-propyl (DnPTP), and iso-propyl (DiPTP), have been investigated in acidic solutions to check the aqueous-phase stability of Eu(L)33+ ions identified previously in the solid state. The data obtained show, first, the presence of stable Eu(L)33+ ions with DnPTP (log β3app = 12.0 ± 0.5) and DiPTP (log β3app = 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)33+ ions. Other complexes such as Eu(L)23+ ions are only observed for DnPTP (log β2app = 6.7 ± 0.5) and DMTP (log β2app = 6.3 ± 0.1) and Eu(L)3+ only for DMTP (log β1app = 2.9 ± 0.2). The log βnapp values for the Eu(L)n3+ (n = 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. ER -