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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2010, 39, 923 - 929, DOI: 10.1039/b919247f

A TRLFS study on the complexation of Cm(III) and Eu(III) with 4-t-butyl-6,6-bis-(5,6-diethyl-1,2,4-triazin-3-yl)-2,2-bipyridine in a water/2-propanol mixture

Sascha Trumm, Georg Lieser, Mark R. S. J. Foreman, Petra J. Panak, Andreas Geist and Thomas Fanghänel

The complexation of Cm(III) and Eu(III) with 4-t-butyl-6,6-bis-(5,6-diethyl-1,2,4-triazin-3-yl)-2,2-bipyridine (t-Bu-C2-BTBP) in water/2-propanol solution is studied. With increasing ligand concentration, 1:2 complexes [M(t-Bu-C2-BTBP)2(H2O)]3+ form from the solvated metal ions. The stability constants are log KCm(III) = 11.1 and log KEu(III) = 9.0. For both Cm(III) and Eu(III), the complexation reaction is both enthalpy and entropy driven. HCm(III) is 11.7 kJ mol-1 more negative than HEu(III), whereas the entropy difference is negligible. This is in good agreement with t-Bu-C2-BTBP's selectivity in liquid–liquid extraction.

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