K. Servaes, C. Hennig, I. Billard
Nov 1, 2007
Citations
0
Influential Citations
53
Citations
Journal
European Journal of Inorganic Chemistry
Abstract
Complex formation between the uranyl ion and nitrate ions in acetonitrile and the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C4mim][Tf2N]) has been studied by absorption, magnetic circular dichroism (MCD) and uranium LIII EXAFS spectroscopy. The experimental results point to the existence of a trinitrate species [UO2(NO3)3] – with D3h symmetry in both solvents. The atomic distances in the uranium(VI) coordination sphere for the trinitrato complex in acetonitrile are U–Oax = 1.77 0.01 A and U–Oeq = 2.48 0.01 A. EXAFS data show that the uranyl ion in the ionic liquid is surrounded by six oxygen atoms in the equatorial plane at a distance of 2.49 0.01 A. The U–N distance of 2.92 0.01 A indicates a