Lanthanide and actinide speciation in molten fluorides: A structural approach by NMR and EXAFS spectroscopies

Bessada, Catherine; Rakhmatullin, Aydar; Rollet, Anne‐Laure; Zanghi, Didier

doi:10.1016/j.jnucmat.2006.08.012

Cited by 51 publications

(82 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The total spectrum now extends over at least 1 MHz and, in contrast to Figure 1b, clearly reveals a CSA-type pattern. The spinning sideband patterns of the two species are similar [31], so that the global envelope resembles that of a single species. The spectrum in Figure 1c shows a nearly flat excitation profile, without any negative sidebands that are Hence, the K value achievable with a 45°-s-45°-s 0 spin echo is 0.47.…”

Section: Resultsmentioning

confidence: 92%

“…In CeF 3 , two distinct 19 F sites have been observed [31] in a MAS spectrum recorded at 9.4 T (376.3 MHz for 19 F) with a 2.5 mm rotor and a spinning frequency m rot = 35 kHz, using a single short pulse of duration s p = 0.5 ls [31]. The spectrum features two sets of interleaved and partially overlapping spinning sidebands that are separated by 33.6 ppm = 12.6 kHz, extending over more than 1000 ppm or 380 kHz.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Broadband excitation in solid-state NMR of paramagnetic samples using Delays Alternating with Nutation for Tailored Excitation (‘Para-DANTE’)

Carnevale

Vitzthum

Lafon

et al. 2012

Chemical Physics Letters

View full text Add to dashboard Cite

a b s t r a c tThis Letter shows that interleaved sequences of short pulses in the manner of 'Delays Alternating with Nutation for Tailored Excitation' (DANTE) with N = 1, 2, 3 . . . equidistant pulses per rotor period extending over K rotor periods can be used to excite, invert or refocus a large number of spinning sidebands of spin-1/2 nuclei in paramagnetic samples where hyperfine couplings lead to very broad spectra that extend over more than 1 MHz. The breadth of the response is maintained for rf-field amplitudes as low as 30 kHz since it results from cumulative effects of individual pulses with very short durations.

show abstract

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Broadband excitation in solid-state NMR of paramagnetic samples using Delays Alternating with Nutation for Tailored Excitation (‘Para-DANTE’)

Carnevale

Vitzthum

Lafon

et al. 2012

Chemical Physics Letters

View full text Add to dashboard Cite

show abstract

“…10, we can conclude that the most stable complexes of LiF-ThF 4 are ThF 6 2-, ThF 7 3− and ThF 8 4− . Some work has already done by NMR technique thanks to Bessada and Numakura showed also the number of fluorides is 7-8 around thorium [22,23].…”

Section: Mathematical Analysis Of Th(iv)/th Equilibrium Potential Evomentioning

confidence: 99%

Electrochemistry of thorium fluoride in LiCl-KCl eutectic melts and methodology for speciation studies with fluorides ions

Delpech

Jaskierowicz

Rodrigues

2014

Electrochimica Acta

View full text Add to dashboard Cite

“…Recently, a number of reports on the speciation of rare-earth ions in ionic liquids have appeared. [49,50,51,52] The trivalent rare-earth ions are well known for their luminescence properties. [53,54] The shielding of the 4f shell by the closed 5s and 5p shells gives rise to line-like absorption and emission spectra for the electronic f-f transitions.…”

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

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

Lanthanide and actinide speciation in molten fluorides: A structural approach by NMR and EXAFS spectroscopies

Cited by 51 publications

References 14 publications

Broadband excitation in solid-state NMR of paramagnetic samples using Delays Alternating with Nutation for Tailored Excitation (‘Para-DANTE’)

Broadband excitation in solid-state NMR of paramagnetic samples using Delays Alternating with Nutation for Tailored Excitation (‘Para-DANTE’)

Electrochemistry of thorium fluoride in LiCl-KCl eutectic melts and methodology for speciation studies with fluorides ions

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

Contact Info

Product

Resources

About