Pb(UO2)(V2O7), a novel lead uranyl divanadate

Obbade, S.; Dion, C.; Saadi, Mohamed; Yagoubi, S.; Abraham, Francis

doi:10.1016/j.jssc.2004.07.055

Cited by 47 publications

(53 citation statements)

References 28 publications

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“…The uranyl groups U(4)O 2 2+ (polyhedra, yellow) in the structure of 2 are coordinated by two uranyl groups U(1) O 2 2+ and form a new geometry of cation-cation interactions. This trimer is schematically presented in Figure 4 (b), and is an isomer of the trimer previously observed in Li 2 (UO 2 ) 4 (WO 4 ) 4 O, [9] and eight recognized types of cationcation interactions in uranyl compounds. [10] …”

Section: Resultsmentioning

confidence: 56%

Uranium(VI) Adopts a Tetraoxido Core

Ling

Wang

et al. 2009

Eur J Inorg Chem

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Section: Resultsmentioning

confidence: 56%

Uranium(VI) Adopts a Tetraoxido Core

Ling

Wang

et al. 2009

Eur J Inorg Chem

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“…The "blue" group and geometrically similar ones play an important role in the topology of uranyl tungstates. [18][19][20][21][22][34][35][36] The "blue" chains are linked by intermediate "red" and "yellow" groups which are the projections of W 3 O 13 and single UO 7 units, respectively. To the best of our knowledge, this is the first time that such a topology has been found in inorganic oxo-salt compounds.…”

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confidence: 99%

Polytypism and oxo-tungstate polyhedra polymerization in novel complex uranyl tungstates

et al. 2012

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The chemistry of actinides is an important and currently active field of inorganic chemistry. Actinides and their compounds play a prime role in nuclear waste management and safety assessment. [1][2][3] In particular, investigations of complexation of uranyl ions 4-6 with oxygen-based complexes consisting of highvalent elements such as S, Cr, Se, Mo or W have high relevance for nuclear waste disposal, owing to their use in nuclear engineering (e.g., Mo 7 and W 8 are used in refractory alloys) or due to their formation in burn-up processes of nuclear fuel (Mo, Se). 9 Actinide sulfates, chromates and selenates are known to form diverse and complex structures with such interesting structural features as cation-cation interactions, microporous frameworks and nanotubules. [10][11][12][13][14][15][16] Actinide molybdates and tungstates may adopt structure types more resembling dense complex oxides than oxosalts. 4 In comparison to molybdates, uranyl tungstates are less studied with relatively few reports available in the literature. 17 The mixture was heated to 820°C for 4 h and cooled down to room temperature with the rate of 7°C h −1 . The obtained product consisted of yellowish crystals of 1 and 2 immersed within an amorphous yellow solid. Powder samples consisting of both 1 and 2 phases were prepared by heating a mixture of CsNO 3 (0.273 g, 1.40 mmol), UO 3 (0.400 g, 1.40 mmol) and WO 3 (0.324 g, 1.40 mmol) in a 1 : 1 : 1 molar ratio at 750°C for 72 h in a porcelain crucible. X-ray powder diffraction indicated that the sample is a mixture of α-and β-Cs 2 [(UO 2 ) 2 (W 2 O 9 )] in a ratio 1 : 4 (Fig. S1 †). Our attempts to obtain pure powders of either α-or β-Cs 2 [(UO 2 ) 2 (W 2 O 9 )] were not successful. Single crystals of 3 were obtained by high-temperature solid-state reaction of an initial mixture of RbNO 3 (0.103 g, 0.70 mmol), UO 3 (0.200 g, 0.70 mmol) and WO 3 (0.162 g, 0.70 mmol) with a Rb : U : W ratio equal to 1 : 1 : 1. The mixture was slowly heated to 870°C in a porcelain crucible and then cooled down to 400°C at a rate of 4°C h −1 . The product consisted of yellowish crystals of 3 in a glassy amorphous mass. Single crystals of the obtained phases were investigated by means of single-crystal X-ray diffraction analysis. It is noteworthy that the crystals of 1 were observed to be of considerably lower quality in comparison to the crystals of 2, which may indicate its lower stability.The structures of all three compounds are based upon 2D uranyl tungstate layers (Fig. 1). The layers in these structures are based on UO 2 2+ linear groups linked with oxo-tungstates polyhedra. In all three structures, U 6+ cations form linear uranyl groups, [OvUvO] 2+ , equatorially coordinated by five O atoms. In the structures of 1 and 2, UO 7 pentagonal bipyramids share edges to † Electronic supplementary information (ESI) available: Includes powder diffractograms and IR spectra. CCDC 881326-881328. For ESI and crystallographic data in CIF or other electronic format see

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“…Our group of research mainly focuses on the solid state chemistry of uranyl-vanadates compounds [1][2][3][4][5][6][7]. In almost the studied oxides, the association of uranyl polyhedra through vanadate oxoanions leads to bi-dimensional anionic sheets with contercation in the interlayer space.…”

Section: Introductionmentioning

confidence: 99%