1992
DOI: 10.1107/s0108270191006753
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Structure of bis(ammonium) hexanitratoplutonium(IV) and bis(ammonium) hexanitratothorium(V)

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Cited by 32 publications
(32 citation statements)
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“…16 In contrast, the corresponding Np(IV) compounds 3 and 4 are more colourless as shown in Fig. 1 6 ] 2À and lattice parameters are almost identical between corresponding U(IV)-and Np(IV) compounds (Fig. S4, Tables S1 and S2, ESI †).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…16 In contrast, the corresponding Np(IV) compounds 3 and 4 are more colourless as shown in Fig. 1 6 ] 2À and lattice parameters are almost identical between corresponding U(IV)-and Np(IV) compounds (Fig. S4, Tables S1 and S2, ESI †).…”
Section: Resultsmentioning
confidence: 99%
“…2 Among the various oxidation numbers available for actinide elements relevant to nuclear fuel recycling, the tetravalent state, An(IV), is highly important especially in terms of Pu 4+ separation by solvent extraction with tri-n-butyl phosphate (TBP). The limiting An 4+ complexes with NO 3 À are [An(NO 3 ) 6 ] 2À (An ¼ Th, [3][4][5][6][7] U, 8,9 Np, 10,11 Pu 12-14 ), which usually crystallize with various countercations having relatively low hydration enthalpy like heavy alkali metals and quaternary ammonium ions (NR 4 + , R ¼ H, alkyl). 15 To our best knowledge, all the reported compounds of An(IV) usually exhibit original colours dened by their respective 5f electronic congurations.…”
Section: Introductionmentioning
confidence: 99%
“…The thorium atoms reside on 3 sites, thus yielding an almost regular icosahedron with ThÀO bond lengths of 2.566(3) ( 6) and 2.575(2) ( 6). This coordination number is known from classical anions such as [Th(NO 3 ) 6 ] 2À [14] and is allowed by a combination of the large size of the Th 4+ cation (1.21 ) [15] and the small size and chelating nature of the borate anions. [10] The borate anions are polymerized and form B 10 O 24 (4D6&) clusters with threefold symmetry that bridge between the thorium centers, and the hydroxide bridge between borate groups can be inferred from bond lengths and bond-valence considerations.…”
mentioning
confidence: 99%
“…Note that even coordination shells more distant than the first metal-oxygen coordination sphere, visible as FT peaks near 3/~,, are nearly the same in HA and Bio-Rex70 samples. Silverton & Hoard (1963) for Hf(aeac)4 and by Spirlet et al (1992) for [(C2Hs)4N]2Th(N03)6.…”
Section: Hf and Th L3 Exafs Spectramentioning
confidence: 99%
“…Theoretical oxygen backscattering amplitude and metal-oxygen phase-shift functions, calculated using FEFF7 (Zabinsky et al, 1995), were applied during fits to the data. Theoretical functions were calculated for a 29 atom cluster using either atomic positions for Hf(acac)4 (Silverton & Hoard, 1963), or those for [NH4]2Th(NO3)6 (Spirlet et al, 1992).…”
Section: Exafs Measurementsmentioning
confidence: 99%