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Issue 39, 2015
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TRLFS study on the complexation of Cm(iii) and Eu(iii) with SO3-Ph-BTBP

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Abstract

The complexation of Cm(III) and Eu(III) with a water soluble BTBP (sodium 3,3′,3′′,3′′′-([2,2′-bipyridine]-6,6′-diylbis(1,2,4-triazine-3,5,6-triyl))tetrabenzenesulfonate, SO3-Ph-BTBP) is studied using time resolved laser fluorescence spectroscopy. For the complexation of Cm(III) the influence of the medium (10−3 M HClO4 → 0.5 M HNO3) is investigated in detail revealing important impacts of the applied medium (pH, ionic strength, anions) on the speciation and conditional stability constants. SO3-Ph-BTBP forms 1 : 2 complexes with Cm(III) and Eu(III). The conditional stability constants of [Cm(SO3-Ph-BTBP)2]5− and [Eu(SO3-Ph-BTBP)2]5− in 0.5 M HNO3 are determined to be log β02 = 7.3 ± 0.3 and log β02 = 5.4 ± 0.5, respectively. The difference of 1.9 orders of magnitude is in line with hydrophobic BT(B)P type ligands and shows that the selectivity is not affected by tuning the hydrophilicity using SO3-Ph-side chains.

Graphical abstract: TRLFS study on the complexation of Cm(iii) and Eu(iii) with SO3-Ph-BTBP

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Publication details

The article was received on 29 Jul 2015, accepted on 02 Sep 2015 and first published on 07 Sep 2015


Article type: Paper
DOI: 10.1039/C5DT02923F
Dalton Trans., 2015,44, 17143-17151

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    TRLFS study on the complexation of Cm(III) and Eu(III) with SO3-Ph-BTBP

    C. Wagner, U. Müllich, A. Geist and P. J. Panak, Dalton Trans., 2015, 44, 17143
    DOI: 10.1039/C5DT02923F

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