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Determination of Successive Complexation Constants in an Ionic Liquid: Complexation of UO22+ with NO3− in C4-mimTf2N Studied by UV−Vis Spectroscopy

Abstract : The complexation of UO22+ with NO3− has been investigated in the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide by UV−vis spectroscopy at T = 18.5 °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, UO2(NO3)3−, is dominating the speciation for a reagent ratio of [NO3−]/[UO22+] > 3. Assuming three successive complexation steps, the conditional stability constants are calculated, the individual absorption spectra are derived, and a speciation plot is presented.
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http://hal.in2p3.fr/in2p3-00734038
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Submitted on : Tuesday, October 12, 2021 - 3:02:31 PM
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Sylvia Georg, Isabelle Billard, Ali Ouadi, Laetitia Petitjean, Michel Picquet, et al.. Determination of Successive Complexation Constants in an Ionic Liquid: Complexation of UO22+ with NO3− in C4-mimTf2N Studied by UV−Vis Spectroscopy. Journal of Physical Chemistry B, American Chemical Society, 2010, 114, pp.4276-4282. ⟨10.1021/jp9107624⟩. ⟨in2p3-00734038⟩

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