International Summer School PROGRAM - Laboratoire d'Infochimie ...

UO2 2+ /XO4 - /Tf2N -
System (X=Re, Tc) in Various Ionic Liquids and
Comparison with Water and Acetonitrile
O. Klimchuk a, c , A. Ouadi a , S. Georg a , I. Billard a , C. Gaillard
a) IPHC, DRS/CHNU, 23 rue du Loess, 67037 Strasbourg Cedex 2, France
b) Institut de Physique Nucléaire de Lyon, 4 rue Enrico Fermi, 69622
Villeurbanne, France
c) Institute of Organic Chemistry, Ukraine, Murmanska str., 502660, Kyiv-94,
Ukraine
Room Temperature Ionic Liquids (RTILs) are a class of “green” solvents which
have been intensively studied in the past 10 years in different fields of extraction and
nuclear chemistry. Their physico-chemical properties are easily tunable by changes in
their chemical structure, so that they are often called “design solvents”. Although such
aspects are indeed rather interesting in view of potential industrial applications, to our
opinion, the unusual solvation properties of these media are a much more appealing
advantage.
The complexation of perrhenate (ReO4 - ) and pertechnetate (TcO4 - ) anions by the
uranyl (UO2 2+ ) cation is investigated by spectroscopic (UV-Vis, luminescence and
EXAFS) means in water, acetonitrile and three different hydrophobic ionic liquids (ILs)
(tributylmethylammoniumTf2N, trimethylbutylammoniumTf2N and 1-methyl-3butylimidazoliumTf2N,
where Tf2N – stands for (CF3SO2)2N -
).
The results of complexation and extraction will be presented. It will be shown
that XO (X = Re, Tc) behaves as a weak ligand in aqueous solution and as strong
ligand in acetonitrile and in the ILs.
4 -
b