Structure du nitrate de thorium(IV) tétrahydraté

Charpin, P.; Chevrier, G.; Lance, M.; Nierlich, Martine; Vigner, D.; Livet, J.; Musikas, C.

doi:10.1107/s010827018709231x

Cited by 18 publications

(18 citation statements)

References 3 publications

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“…A molecular species containing eight uranyl ions is built in fact from four bis(carboxylato)-bridged [(UO 2 ) 2 (µ-O 2 )] species. 22 A nuclearity of six is obtained by bridging two [(UO 2 ) 3 (µ 3 -O)] units by two µ-azido-N,N moieties, 23 whereas it is also observed in the complex of p-benzylcalix [7]arene cited above, 9f in which the uranyl cations are either directly bound one to the other, or bridged by µ-phenoxo or µ 3 -oxo units. More examples exist for tetrauranate species, in which a usual central core is [(UO 2 ) 4 (µ 3 -O) 2 ] (encountered also in the p-benzylcalix [7]arene complex), completed by various monodentate or polydentate and bridging species, 24 but which can also arise from arrangements involving bridging ligands, µ 3 -oxo ions and direct uranyl-uranyl oxo bonding.…”

Section: Resultsmentioning

confidence: 97%

Uranyl ion complexation by medium and large homooxacalixarenes: from mono- to poly-uranate complexes

Thuéry

Nierlich

Vicens

et al. 2001

J. Chem. Soc., Dalton Trans.

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Crystal structures of dioxouranium() complexes of three homooxacalix [n]arenes (n = 4, 6 or 8) have shown the possibility to complex metal moieties of variable nuclearity, depending upon the number of phenolic groups and ether links they contain. p-tert-Butyltetrahomodioxacalix [6]arene embraces a single uranyl unit through tetraphenoxide coordination as commonly observed in calixarene complexes, whereas p-methyloctahomotetraoxacalix[4]arene binds a doubly bridged binuclear species coordinated to both phenoxide and ether oxygen donors, while the large p-tert-butyloctahomotetraoxacalix [8]arene binds a unique tetrauranate cluster containing both double and single oxygen bridges between uranium atoms and involving only phenoxide-oxygen coordination to the macrocycle. An additional crystal structure determination on the triethylammonium complex of the singly deprotonated homooxacalix [6]arene enables some comments to be made on the effects of coordination on the macrocycle conformation. The relation between the nuclearity of the uranyl complexes with ligands in the calixarene/homooxacalixarene family and the size of the ligands is discussed.

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Section: Resultsmentioning

confidence: 97%

Uranyl ion complexation by medium and large homooxacalixarenes: from mono- to poly-uranate complexes

Thuéry

Nierlich

Vicens

et al. 2001

J. Chem. Soc., Dalton Trans.

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“…It is interesting to point out that the X-ray structure of Th(NO 3 ) 4 (H 2 O) n is known with three and with four water molecules coordinated to the thorium center. However, in a water–acetone mixture, a proton magnetic resonance study resulted in a hydration number of 2.9 for Th(NO 3 ) 4 (H 2 O) n .…”

Section: Resultsmentioning

confidence: 99%

Computational Study of Reduction Potentials of Th⁴⁺ Compounds and Hydrolysis of ThO₂(H₂O)_n, n = 1, 2, 4

Gorden

McKee

2016

J. Phys. Chem. A

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The stability of Th to reduction in water is studied by DFT methods. The standard reduction potential (SRP) of homoleptic complexes including Th(HO), Th(HO), Th(NO), Th(NO), Th(NO), Th(COT), Th(acac), ThCp, ThF, and ThCl have been investigated. The values vary widely (from -3.50 V for Th(OH) to -0.62 V for Th(NO) depending on whether the ligands are redox active (noninnocent) or not. Several additional topics of thorium chemistry are explored, including the hydrolysis mechanism of ThO(HO), n = 1, 2, 4, and the solution phase nonzero dipole moment of ThCp. Dinuclear complexes are also characterized, including ThO, ThO(OH), ThO(HO), Th(OH)(HO), and Th(OH)(NO)(HO) and condensed thorium complexes as [Th(OH)(HO)] and [Th(OH)(HO)]. For the Th(OH)(NO)(HO) dinuclear complex, the first SRP is -0.82 V and the second is 1.59 V. The first SRP corresponds to the reduction of the ligand NO, and the second SRP corresponds to dissociative electron transfer to the NO ligand. The calculated formation constant of Th(EDTA)(HO) is in reasonable agreement with experiment. The different stereochemistries of the bidentate ligands NO, NO, and acetylacetonate (acac) around the thorium center have very similar stabilities.

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“…It represents also one of the highest nuclearities in dioxouranium() assemblies, apart from the frequent polymeric chain arrangement of uranyl ions; another uranyl hexanuclear complex has been reported, which is also based on the oxo-centred trinuclear motif but in which two such moieties are linked by two azido bridges. 29 The complex core (UO 2 2ϩ ) 6 (L 7Ϫ ) 2 (O 2Ϫ ) 2 bears a 6Ϫ charge, which is equilibrated by six protonated DABCO molecules. Four are located on the external sides of the molecule and are hydrogen bonded to the phenolic oxygen atoms O(5), O (7), O(5Ј) and O(7Ј), which are also bonded to U(2) and U(2Ј).…”

Section: Resultsmentioning

confidence: 99%

Complexation of a hexameric uranium(VI) cluster by p-benzylcalix[7]arene

Thuéry¹,

Nierlich²,

Souley³

et al. 1999

J. Chem. Soc., Dalton Trans.

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Structure du nitrate de thorium(IV) tétrahydraté

Cited by 18 publications

References 3 publications

Uranyl ion complexation by medium and large homooxacalixarenes: from mono- to poly-uranate complexes

Uranyl ion complexation by medium and large homooxacalixarenes: from mono- to poly-uranate complexes

Computational Study of Reduction Potentials of Th⁴⁺ Compounds and Hydrolysis of ThO₂(H₂O)_n, n = 1, 2, 4

Complexation of a hexameric uranium(VI) cluster by p-benzylcalix[7]arene

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Structure du nitrate de thorium(IV) tétrahydraté

Cited by 18 publications

References 3 publications

Uranyl ion complexation by medium and large homooxacalixarenes: from mono- to poly-uranate complexes

Uranyl ion complexation by medium and large homooxacalixarenes: from mono- to poly-uranate complexes

Computational Study of Reduction Potentials of Th4+ Compounds and Hydrolysis of ThO2(H2O)n, n = 1, 2, 4

Complexation of a hexameric uranium(VI) cluster by p-benzylcalix[7]arene

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Computational Study of Reduction Potentials of Th⁴⁺ Compounds and Hydrolysis of ThO₂(H₂O)_n, n = 1, 2, 4