Structure du bis(N,N-dibutyldodécanamide)dinitratodioxouranium(VI)

Charpin, P.; Lance, M.; Nierlich, Martine; Vigner, D.; Descouls, N.; Musikas, C.

doi:10.1107/s0108270186095409

Cited by 21 publications

(18 citation statements)

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“…The single-crystal structure of the U(N 3 ) 7 3À ion in 1 b, which was recrystallized from a saturated CH 3 CH 2 CN solution as the (Bu 4 N) 3 [U(N 3 ) 7 ] salt, clearly shows a distorted pentagonal-bipyramid 1:5:1 arrangement of seven azide ligands around the central uranium(iv) atom. The UÀN a bond lengths of 2.323(6)-2.431 (7) (5) ), [14b] and are in reasonable agreement with those observed in (Et 4 N) 4 …”

Section: àsupporting

confidence: 77%

“…X-ray diffraction revealed that these crystals were not the salt containing the octaazidouranate anion, (Bu 4 N) 4 [U(N 3 ) 8 ], which was expected based on the stoichiometry used, but the heptaazide (Bu 4 N) 3 (1)]. It is worth mentioning, that to the best of our knowledge no structurally characterized octaazide of any element has been reported.…”

Section: àmentioning

confidence: 88%

“…It is worth mentioning, that to the best of our knowledge no structurally characterized octaazide of any element has been reported. Nevertheless, the isolation of the heptaazide was initially surprising, because preliminary results from our laboratory indicate that from a related reaction, the octaisoselenocyanatouranate anion can be prepared in the form of the (Pr 4 N) 4 [U(NCSe) 8 ]·2 CFCl 3 salt, [8b] in analogy to the previously reported salts of the U(NCS) 8 4À ion. [14] ðBu 4 NÞ 2 ½UCl 6 þ Bu 4 NBr þ 7 AgN 3…”

Section: àmentioning

confidence: 95%

“…[6] The [UO 2 (N 3 ) 4 ] 2À ion has been extensively investigated and unambiguously characterized by Beck and co-workers, [7] and we have recently reported the crystal structures of salts containing [UO 2 (N 3 ) 4 ] 2À and related anions. [8] However, in all of the above-mentioned compounds no binary U-N system was isolated.…”

mentioning

confidence: 99%

“…A few structurally characterized uranium azides have previously been reported, namely polymeric uranyl(vi) azide anions [4] and the [UO 2 {(CF 3 CO) 2 CH} 2 N 3 ] À ion, [5] as well as the uranium(iv) compound [{(ArO) 3 tacn}U(N 3 )] ((ArOH) 3 tacn = 1,4,7-tris (3,5-di-tert-butyl-2-hydroxybenzyl)-1,4,7-triazacyclononane). [6] The [UO 2 (N 3 ) 4 ] 2À ion has been extensively investigated and unambiguously characterized by Beck and co-workers, [7] and we have recently reported the crystal structures of salts containing [UO 2 (N 3 ) 4 ] 2À and related anions.…”

mentioning

confidence: 99%

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UN₂₁³⁻: A Structurally Characterized Binary Actinide Heptaazide Anion

2005

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More stable than it seems: The binary uranium–nitrogen anion U(N3)73− was synthesized and characterized as the (Bu4N)3[U(N3)7] salt. The U(N3)73− ion is the first structurally characterized heptaazide and is the first homoleptic azide of an actinide. The crystal structure shows a pentagonal‐bipyramidal arrangement of the azide ligands around the central uranium(IV) atom (see structure; N: blue; U: green).

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Section: àsupporting

confidence: 77%

Section: àmentioning

confidence: 88%

Section: àmentioning

confidence: 95%

mentioning

confidence: 99%

mentioning

confidence: 99%

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UN₂₁³⁻: A Structurally Characterized Binary Actinide Heptaazide Anion

2005

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Investigating Actinyl Oxo Cations by X‐ray Absorption Spectroscopy

et al. 2003

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Early actinide elements (from U to Am) have the ability to form linear trans-dioxo complexes with formal valence of the actinide being equal to (V) or (VI). For instance, the ubiquity of the uranyl cation in uranium aqueous chemistry is the basis for its very important industrial and environmental concerns. As a result, the physical chemistry of the actinyl moieties has been the subject of constantly growing investigations. Among all the spectroscopic probes, X-ray absorption spectroscopy is a particularly useful element and energy-selective technique. This article reviews the investigation of molecular actinyl complexes using both XANES and EXAFS tools. The absorption edge features have long been used to characterize the frontier orbitals of the absorbing atom. In the case of actinide cations, the L III edge, located in the hard X-ray region, provides a useful fingerprint of the cation polyhedron. Tentatively, simple molecular orbital considerations together with full multiple scattering simulation codes have MICROREVIEWS: This feature introduces the readers to the author's research through a concise overview of the selected topic. Reference to important work from others in the field is included. Complementary structural data can be obtained in the EXAFS region of the absorption spectrum. In the literature, such molecular systems have been well documented from uranyl aqueous chemistry to neptunyl or plutonyl coordination complexes with oxygen donor ligands. Furthermore, complexation mechanisms upon absorption onto mineral surfaces have been increasingly investigated over the past few years. Overall, contribution of the XAS technique to a better understanding of the actinide bonding is demonstrated from various examples of the literature and the authors' data. Importance of the simulation codes in order to better describe the absorption features is also strongly underlined.

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