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Issue 48, 2012
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Complexation of Cm(iii) and Eu(iii) with a hydrophilic 2,6-bis(1,2,4-triazin-3-yl)-pyridine studied by time-resolved laser fluorescence spectroscopy

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Abstract

The complexation of Cm(III) and Eu(III) with 2,6-bis(5,6-di(sulfophenyl)-1,2,4-triazin-3-yl)pyridine (aq-BTP) is studied in water at pH 3.0 applying time-resolved laser fluorescence spectroscopy. With increasing ligand concentration [M(H2O)9−3n(aq-BTP)n] (M = Cm(III)/Eu(III), n = 1, 2, 3) complex species are spectroscopically identified. The conditional stability constants of the M(III) 1 : 3 complex species with aq-BTP are log β03 = 12.2 for Cm(III) and log β03 = 10.2 for Eu(III). The complexation reaction is enthalpy- and entropy-driven for both metal ions, while the enthalpy change ΔH03 is 9.7 kJ mol−1 more negative for Cm(III); changes in ΔS03 are marginal. The difference in ΔG03 of −12.7 kJ mol−1 between the formation of the [M(aq-BTP)3] complexes agrees with aq-BTP's selectivity in liquid–liquid extraction studies.

Graphical abstract: Complexation of Cm(iii) and Eu(iii) with a hydrophilic 2,6-bis(1,2,4-triazin-3-yl)-pyridine studied by time-resolved laser fluorescence spectroscopy

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Publication details

The article was received on 01 Aug 2012, accepted on 11 Sep 2012 and first published on 12 Sep 2012


Article type: Paper
DOI: 10.1039/C2DT31748F
Dalton Trans., 2012,41, 14594-14602

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    Complexation of Cm(III) and Eu(III) with a hydrophilic 2,6-bis(1,2,4-triazin-3-yl)-pyridine studied by time-resolved laser fluorescence spectroscopy

    C. M. Ruff, U. Müllich, A. Geist and P. J. Panak, Dalton Trans., 2012, 41, 14594
    DOI: 10.1039/C2DT31748F

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