Structure of a uranyl diselenite, UO2Se2O5

Trombe, Jean‐Christian; Gleizes, Aude; Galy, J.

doi:10.1107/s0108270185008599

Cited by 17 publications

(30 citation statements)

References 2 publications

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“… 44 , 45 In both these cases, the thiocarboxylates act as chelating bidentate ligands, and the bridging of a lanthanide ion and a transition metal in the μ 1,3 -fashion observed for 1Gd is hitherto unknown. A related bridging motif is however observed for a series of heterobimetallic dithiooxalate-bridged compounds of formulation [{Ln III (H 2 O) n } 2 {Ni II (dto) 2 } 3 ]· x H 2 O (dto 2– = dithiooxalate) 46 – 48 as well as for the systems [M III {(dto)Dy III (tp) 2 } 3 ]·4MeCN·2CH 2 Cl 2 (M III = Fe III , Co III ; tp – = hydrotrispyrazolylborate), 49 in which the dithiooxalate ligands selectively coordinate the softer 3d metal ions through the sulphur atoms, while the lanthanide ions are exclusively coordinated by the oxygen atoms of the bridging ligands.…”

Section: Resultsmentioning

confidence: 97%

Imposing high-symmetry and tuneable geometry on lanthanide centres with chelating Pt and Pd metalloligands

et al. 2017

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Section: Resultsmentioning

confidence: 97%

Imposing high-symmetry and tuneable geometry on lanthanide centres with chelating Pt and Pd metalloligands

et al. 2017

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“…The Na-bearing compound was obtained in the presence of sodium oxalate, which probably could be regarded as a catalyst of the uranyl selenite crystallization process. Another five compounds, 11 [38], 21 [43], 27 [33], 28 [38], and 32 [47], were obtained in the gas-solid or hydrothermal reactions using sealed tubes. In the case of the last three compounds, the temperature reached over 425 • C.…”

Section: Synthetic Uranyl Compounds With Selenite Ionsmentioning

confidence: 99%

“…The zippeite fragment of the topology includes selenate tetrahedra, and the phosphuranylite fragment contains selenite groups. The crystal structure of the only uranyl diselenite compound [47] is based on the sheets of miscellaneous anion topology of the 8 1 5 2 3 8 type (Figure 3m,n), consisting of octagons, pentagons, and triangles. The layered complex is built by the dimers of edge-sharing uranyl pentagonal bipyramids, which are arranged similarly as in the structures of such minerals as deliensite, Fe[(UO2)2(SO4)2(OH)2](H2O)7 [85] or plášilite, Na(UO2)(SO4)(OH)(H2O)2 [86], but the linkage character is remarkably different.…”

Section: Topological Analysismentioning

confidence: 99%

Crystal Chemistry and Structural Complexity of Natural and Synthetic Uranyl Selenites

et al. 2019

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Comparison of the natural and synthetic phases allows an overview to be made and even an understanding of the crystal growth processes and mechanisms of the particular crystal structure formation. Thus, in this work, we review the crystal chemistry of the family of uranyl selenite compounds, paying special attention to the pathways of synthesis and topological analysis of the known crystal structures. Comparison of the isotypic natural and synthetic uranyl-bearing compounds suggests that uranyl selenite mineral formation requires heating, which most likely can be attributed to the radioactive decay. Structural complexity studies revealed that the majority of synthetic compounds have the topological symmetry of uranyl selenite building blocks equal to the structural symmetry, which means that the highest symmetry of uranyl complexes is preserved regardless of the interstitial filling of the structures. Whereas the real symmetry of U-Se complexes in the structures of minerals is lower than their topological symmetry, which means that interstitial cations and H 2 O molecules significantly affect the structural architecture of natural compounds. At the same time, structural complexity parameters for the whole structure are usually higher for the minerals than those for the synthetic compounds of a similar or close organization, which probably indicates the preferred existence of such natural-born architectures. In addition, the reexamination of the crystal structures of two uranyl selenite minerals guilleminite and demesmaekerite is reported. As a result of the single crystal X-ray diffraction analysis of demesmaekerite, Pb 2 Cu 5 [(UO 2 ) 2 (SeO 3 ) 6 (OH) 6 ](H 2 O) 2 , the H atoms positions belonging to the interstitial H 2 O molecules were assigned. The refinement of the guilleminite crystal structure allowed the determination of an additional site arranged within the void of the interlayer space and occupied by an H 2 O molecule, which suggests the formula of guilleminite to be written as Ba 3 . occurrence is limited to just a few localities. First, these are Musonoi and Shinkolobwe mines in DR Congo [6], two of the minerals were only found in the Repete mine (San Juan County, Utah, USA) [5], and a few more occurrences in Europe could be mentioned (small uranium deposit Zálesí in the Czech Republic, Liauzun in France, and La Creusaz U prospect in Switzerland) [8]. Nevertheless, apart from mineralogy, uranyl selenites are of great interest from the geochemical and radiochemical points of view. It is known that fission products contain 53 g per ton [9] of long-lived 79 Se isotope with a half-life of 1.1 × 10 6 years [10] after three years of nuclear fuel irradiation in the reactor. Thus, an understanding of the processes of mineral formation in nature and their synthetic analogs in laboratories can help in the processing of nuclear wastes. Crystal chemical and structural investigations are key points in such a material's scientific studies due to the essential knowledge of how the variation in the chemical composi...

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“…(1) 82.27 (12) ?Symmetry transformations used to generate equivalent atoms: C1, !x#1,!y#2,!z#1; C2, x#1, y, z; C3, !x#1,!y#1, !z#1; C4, !x#2,!y#1,!z#1; C5, !x#1,!y#1,!z; C6, x!1, y, z.…”

Section: Synthesismentioning

confidence: 99%

Cd(VO2)4(SeO3)3·H2O: A New Bimetallic Vanadium Selenite Compound with Heptacoordinated Cadmium Ion

Kim

Park

et al. 2001

Journal of Solid State Chemistry

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Structure of a uranyl diselenite, UO2Se2O5

Cited by 17 publications

References 2 publications

Imposing high-symmetry and tuneable geometry on lanthanide centres with chelating Pt and Pd metalloligands

Imposing high-symmetry and tuneable geometry on lanthanide centres with chelating Pt and Pd metalloligands

Crystal Chemistry and Structural Complexity of Natural and Synthetic Uranyl Selenites

Cd(VO2)4(SeO3)3·H2O: A New Bimetallic Vanadium Selenite Compound with Heptacoordinated Cadmium Ion

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