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Verfasst von:Bremer, Antje [VerfasserIn]   i
 Müllich, Udo [VerfasserIn]   i
 Geist, Andreas [VerfasserIn]   i
 Panak, Petra [VerfasserIn]   i
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
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.
DOI:doi:10.1039/C4NJ01900H
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1039/C4NJ01900H
 Volltext: https://pubs.rsc.org/en/content/articlelanding/2015/nj/c4nj01900h
 DOI: https://doi.org/10.1039/C4NJ01900H
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1698965427
Verknüpfungen:→ Zeitschrift

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