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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.
MedLine Citation:
PMID:  23018544     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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(H(2)O)(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 β(03) = 12.2 for Cm(iii) and log β(03) = 10.2 for Eu(iii). The complexation reaction is enthalpy- and entropy-driven for both metal ions, while the enthalpy change ΔH(03) is 9.7 kJ mol(-1) more negative for Cm(iii); changes in ΔS(03) are marginal. The difference in ΔG(03) 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.
Authors:
Christian M Ruff; Udo Müllich; Andreas Geist; Petra J Panak
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-27
Journal Detail:
Title:  Dalton transactions (Cambridge, England : 2003)     Volume:  -     ISSN:  1477-9234     ISO Abbreviation:  Dalton Trans     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101176026     Medline TA:  Dalton Trans     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P. O. Box 3640, 76021 Karlsruhe, Germany. Christian.ruff@kit.edu.
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