Highly Porous Uranyl Selenate Nanotubules

Krivovichev, Sergey V.; Kahlenberg, Volker; Тананаев, И. Г.; Kaindl, Reinhard; Mersdorf, Edgar; Myasoedov, Β. F.

doi:10.1021/ja0436289

Cited by 168 publications

(82 citation statements)

References 31 publications

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“…around bridging oxygen atoms, to result in a symmetry reduction [60] compared to the ideal symmetry of structural units. In some cases, interactions between interlayer species and uranyl oxysalt units result in distortion of the layer planes and, in rare cases, formation of tubular structures [12][13][14]. The total effect of the 2-D unit bending includes rotation and displacements of individual U-O br -T fragments (Fig.…”

Section: Flexibility Of Structural Unitsmentioning

confidence: 99%

“…The diversity of polyhedral units found in uranyl compounds is unique, starting from isolated complexes [1][2][3] and clusters [4][5][6][7] to cage compounds [8][9][10][11] and nanotubules [12][13][14]. Selenium-containing uranyl oxysalts are known for both monoand divalent inorganic cations [15][16][17][18][19], as well as for organic template molecules of various charge and structure [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Topologically and geometrically flexible structural units in seven new organically templated uranyl selenates and selenite–selenates

Gurzhiy

Kovrugin

Tyumentseva

et al. 2015

Journal of Solid State Chemistry

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a b s t r a c tSingle crystals of seven novel uranyl oxysalts of selenium with protonated methylamine molecules, [C 2 Their crystal structures have been solved by direct methods and their uranyl selenate and selenite-selenate units investigated using black-and-white graphs from the viewpoints of topology of interpolyhedral linkages and isomeric variations. The crystal structure of IV is based upon complex layers with unique topology, which has not been observed previously in uranyl selenates. Investigations of the statistics and local distribution of the U-O br -Se bond angles demonstrates that shorter angles associate with undulations, whereas larger angles correspond to planar areas of the uranyl selenite layers.

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Section: Flexibility Of Structural Unitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Topologically and geometrically flexible structural units in seven new organically templated uranyl selenates and selenite–selenates

Gurzhiy

Kovrugin

Tyumentseva

et al. 2015

Journal of Solid State Chemistry

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“…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.…”

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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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“…In this article, the origin of such discrepancy and its elimination are described. Deeper insight into uranyl-selenium interactions could be important for understanding of some toxic effects 8 and preparation of materials with very specific properties 9 .…”

Section: +mentioning

confidence: 99%

Voltammetric Study of Uranyl–Selenium Interactions. Part 2. Uranyl(V) Selenate Complex

2013

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Abstract. Under the influence of recently published papers and some older own results, complex formation in uranyl(VI)-selenium(VI) system was reinvestigated at the ionic strengths of 0.1 and 3.0 mol L -1 . Using electrolyzed selenate solutions (and square-wave voltammetry as a measuring technique) two coordination species at the higher electrolyte concentration (log β 1 = 1.48 ± 0.01, log β 2 = 2.4 ± 0.1) were recognized, in agreement with the literature data based on other experimental methods. For successful interpretation of the voltammetric data, previously unknown weak complex (log β 01 =0.7 ± 0.1) of the reduction product, i.e. uranyl(V) should also be included in the model. At the lower electrolyte concentration (0.1 mol L -1 ), formation of complexes other than UO 2 SeO 4 0 cannot be unambiguously confirmed due to the narrow ligand concentration range.Concerning the number of coordination species and their stability constants, seemingly different results that arise from voltammetry and other (independent) experimental methods reflect the fact that the former, in addition to the complexation of initially present metal ion, "sees" the coordination of its reduction product with the ligand of interest, too. When both processes are taken into account during treatment of voltammetric data, such differences disappear. (doi: 10.5562/cca1952)

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Highly Porous Uranyl Selenate Nanotubules

Cited by 168 publications

References 31 publications

Topologically and geometrically flexible structural units in seven new organically templated uranyl selenates and selenite–selenates

Topologically and geometrically flexible structural units in seven new organically templated uranyl selenates and selenite–selenates

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

Voltammetric Study of Uranyl–Selenium Interactions. Part 2. Uranyl(V) Selenate Complex

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