Influence of the solvent on the complexation of Cm(III) and Eu(III) with nPr-BTP studied by time-resolved laser fluorescence spectroscopy

• Verfasst von: Bremer, Antje [VerfasserIn]
• Verfasst von: Müllich, Udo [VerfasserIn]
• Verfasst von: Geist, Andreas [VerfasserIn]
• Verfasst von: Panak, Petra [VerfasserIn]
• Titel: Influence of the solvent on the complexation of Cm(III) and Eu(III) with nPr-BTP studied by time-resolved laser fluorescence spectroscopy
• Verf.angabe: Antje Bremer, Udo Müllich, Andreas Geist and Petra J. Panak
• Jahr: 2015
• Jahr des Originals: 2014
• Umfang: 9 S.
• Fussnoten: First published 11 December 2014 ; Gesehen am 28.05.2020
• Titel Quelle: Enthalten in: New journal of chemistry
• Ort Quelle: London : RSC, 1987
• Jahr Quelle: 2015
• Band/Heft Quelle: 39(2015), 2, Seite 1330-1338
• ISSN Quelle: 1369-9261
• DOI: doi:10.1039/C4NJ01900H
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1698965427

Abstract

The complexation of Cm(III) and Eu(III) with 2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine (nPr-BTP) in methanol-water mixtures with varying water content is investigated by TRLFS. For both metal ions, the exclusive formation of the 1 : 3 complex is observed in each solvent mixture. Stability constants are determined by analysis of the fluorescence spectra. As a result, an immense influence of the water content is found. The stability constant of the [Cm(nPr-BTP)3]3+ complex increases by three orders of magnitude when the water content in methanol-water mixtures is reduced (log β3 = 14.3 ± 0.1 at 50 vol% water content; log β3 = 17.4 ± 0.4 at 5 vol% water content). Due to the preferential solvation of Cm(III) by water in methanol-water mixtures, the increase is moderate at water contents between 50 vol% and 20 vol% and becomes steeper at lower water contents. For the [Eu(nPr-BTP)3]3+ complex, an analogous evolution of the stability constant is observed (log β3 = 12.0 ± 0.1 at 50 vol% water content; log β3 = 14.7 ± 0.4 at 5 vol% water content). Therefore, the difference between the stability constants of the Cm(III) and Eu(III) 1 : 3 complexes is constant at all solvent mixtures investigated (Δlog β3 = 2.3 ± 0.3) which means that the selectivity of the N-donor ligand is not influenced by the solvent.