Speciation of Uranyl Nitrato Complexes in Acetonitrile and in the Ionic Liquid 1‐Butyl‐3‐methylimidazolium Bis(trifluoromethylsulfonyl)imide

Servaes, Kelly; Hennig, Christoph; Billard, Isabelle; Gaillard, C.; Binnemans, Koen; Görller‐Walrand, Christiane; Deun, Rik Van

doi:10.1002/ejic.200700475

Cited by 66 publications

(66 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is no residual evidence to indicate that the species UO 2 (SO 4 ) 3 4− is present in the sample series. It can be ruled out that the UO 2 (SO 4 ) 3 4− species at least with D 3h symmetry exist in the solution, because the intense resonances from the E ← A 1 transition, present in D 3h complexes like UO 2 (NO 3 ) 3 − [14], and analog for UO 2 (CO 3 ) 3 4− and UO 2 (CH 3 COO) 3 − , are absent. UO 2 (SO 4 ) 3 4− has been observed in solutions with [SO 4 2− ]/[UO 2 2+ ] ratios > 10 4 [15], which is far from the experimental conditions applied here.…”

Section: Resultsmentioning

confidence: 97%

The relationship of monodentate and bidentate coordinated uranium(VI) sulfate in aqueous solution

Hennig¹,

Ikeda

Schmeide

et al. 2008

Radiochimica Acta

Self Cite

View full text Add to dashboard Cite

The coordination of U(VI) sulfate complexes has been investigated by uranium L-III-edge EXAFS and HEXS measurements with the aim to distinguish monodentate and bidentate coordinated sulfate in aqueous solution. UV-vis absorption spectroscopy has been used to differentiate the species and to determine the species distribution as a function of the [SO42-]/[UO22+] ratio. A monodentate coordination prevails in solutions with [SO42-]/[UO22+] ratio of 1, where UO2SO4 is the dominant species. Besides the dominating monodentate sulfate a small amount of bidentate sulfate could be observed, indicating that two isomers may exist for UO2SO4. With increasing [SO42-]/[UO22+] ratio the UP2(SO4)(2)(2-) species becomes the main species. The uranium atom of this species is coordinated by two bidentate Sulfate groups

show abstract

Section: Resultsmentioning

confidence: 97%

The relationship of monodentate and bidentate coordinated uranium(VI) sulfate in aqueous solution

Hennig¹,

Ikeda

Schmeide

et al. 2008

Radiochimica Acta

Self Cite

View full text Add to dashboard Cite

show abstract

“…73 Very intense negative A terms are typical for the MCD spectra of the [UO 2 (NO 3 ) 3 ] -complex. 70,74 The MCD spectra of both UO 2 (NO 3 (Figure 7). Three sharp and intense peaks are observed between 19 000 and 22 000 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

“…The ground state value of ν s is approximately 867 cm -1 , which resembles the value in acetonitrile (872 cm -1 ). 74 Triacetato Complex. The absorption spectra of solutions prepared by dissolving UO 2 (CH 3 COO) 2 ‚2H 2 O and tetrabutylammonium acetate (uranyl-to-acetate ratio ) 1:4) in the ionic liquid [C 4 mim][Tf 2 N] have an appearance similar to that of the trinitrato complex (Figure 8).…”

Section: Resultsmentioning

confidence: 99%

Speciation of Uranyl Complexes in Ionic Liquids by Optical Spectroscopy

et al. 2007

Self Cite

View full text Add to dashboard Cite

show abstract

“…[70,[73][74][75][76][77][78][79] The advantage of EXAFS spectroscopy is that the element of interest can be investigated selectively by exciting an electron from a well-defined core level. EXAFS reflects only the direct coordination of the excited atom, whereas all other compounds in the sample do not contribute to the spectral features of the signal.…”

Section: Imide ([Hbet]a C H T U N G T R E N N U N G [Tf 2 N]) Is Ablementioning

confidence: 99%

Speciation of Rare‐Earth Metal Complexes in Ionic Liquids: A Multiple‐Technique Approach

Nockemann

Thijs

Lunstroot

et al. 2009

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

The dissolution process of metal complexes in ionic liquids was investigated by a multiple-technique approach to reveal the solvate species of the metal in solution. The task-specific ionic liquid betainium bis(trifluoromethylsulfonyl)imide ([Hbet][Tf(2)N]) is able to dissolve stoichiometric amounts of the oxides of the rare-earth elements. The crystal structures of the compounds [Eu(2)(bet)(8)(H(2)O)(4)][Tf(2)N](6), [Eu(2)(bet)(8)(H(2)O)(2)][Tf(2)N](6) x 2 H(2)O, and [Y(2)(bet)(6)(H(2)O)(4)][Tf(2)N](6) were found to consist of dimers. These rare-earth complexes are well soluble in the ionic liquids [Hbet][Tf(2)N] and [C(4)mim][Tf(2)N] (C(4)mim = 1-butyl-3-methylimidazolium). The speciation of the metal complexes after dissolution in these ionic liquids was investigated by luminescence spectroscopy, (1)H, (13)C, and (89)Y NMR spectroscopy, and by the synchrotron techniques EXAFS (extended X-ray absorption fine structure) and HEXS (high-energy X-ray scattering). The combination of these complementary analytical techniques reveals that the cationic dimers decompose into monomers after dissolution of the complexes in the ionic liquids. Deeper insight into the solution processes of metal compounds is desirable for applications of ionic liquids in the field of electrochemistry, catalysis, and materials chemistry.

show abstract

Speciation of Uranyl Nitrato Complexes in Acetonitrile and in the Ionic Liquid 1‐Butyl‐3‐methylimidazolium Bis(trifluoromethylsulfonyl)imide

Abstract: Keywords: EXAFS spectroscopy / Ionic liquids / Uranium / UV/Vis spectroscopy / X-ray absorption spectroscopy

Cited by 66 publications

References 52 publications

The relationship of monodentate and bidentate coordinated uranium(VI) sulfate in aqueous solution

The relationship of monodentate and bidentate coordinated uranium(VI) sulfate in aqueous solution

Speciation of Uranyl Complexes in Ionic Liquids by Optical Spectroscopy

Speciation of Rare‐Earth Metal Complexes in Ionic Liquids: A Multiple‐Technique Approach

Contact Info

Product

Resources

About