Determination of successive complexation constants in an ionic liquid: complexation of UO(2)(2+) with NO(3)(-) in C(4)-mimTf(2)N studied by UV-Vis spectroscopy

Sylvia Georg; Isabelle Billard; Ali Ouadi; Clotilde Gaillard; Laetitia Petitjean; Michel Picquet; Vitaly Solov'ev

doi:10.1021/jp9107624

Determination of successive complexation constants in an ionic liquid: complexation of UO(2)(2+) with NO(3)(-) in C(4)-mimTf(2)N studied by UV-Vis spectroscopy

J Phys Chem B. 2010 Apr 1;114(12):4276-82. doi: 10.1021/jp9107624.

Authors

Sylvia Georg¹, Isabelle Billard, Ali Ouadi, Clotilde Gaillard, Laetitia Petitjean, Michel Picquet, Vitaly Solov'ev

Affiliation

¹ IPHC, UMR 7178 CNRS-IN2P3 et Université de Strasbourg, 23 rue du Loess, 67037 Strasbourg cedex 2, France.

PMID: 20218577
DOI: 10.1021/jp9107624

Abstract

The complexation of UO(2)(2+) with NO(3)(-) has been investigated in the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide by UV-vis spectroscopy at T = 18.5 degrees C. The complexation is evidenced through the appearance of four peaks at 425, 438, 453, and 467 nm. EXAFS data indicate that the trinitrato complex, UO(2)(NO(3))(3)(-), is dominating the speciation for a reagent ratio of [NO(3)(-)]/[UO(2)(2+)] > 3. Assuming three successive complexation steps, the conditional stability constants are calculated, the individual absorption spectra are derived, and a speciation plot is presented.