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

Content Provider	Royal Society of Chemistry (RSC)
Author	Geist, Andreas Panak, Petra J. Bremer, Antje Müllich, Udo
Copyright Year	2015
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.
Starting Page	1330
Ending Page	1338
Page Count	9
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	2
Journal	New Journal of Chemistry
DOI	10.1039/c4nj01900h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Stability constants of complexes Pyridine Solvation Ligand Fluorescence Propyl group Solvent
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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