Synthesis, Structure, and Photoluminescence Properties of an Organically‐Templated Uranyl Selenite

Li, Dongsheng; Kuang, Han-Mao; Chen, Wen‐Tong; Luo, Qiu‐Yan; Sui, Yan

doi:10.1002/zaac.201500277

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…Here, the temperature and amine molecules or ionic liquids [58] acted as a reduction agent for H 2 SeO 4 , since it is known that the selenic acid is easily reduced to H 2 Se 4+ O 3 and oxygen upon heating above 160 • C [61]. The other two organically templated uranyl selenites (33 [48] and 36 [50]) were obtained during evaporation at room temperature from the aqueous solution of UO 2 (NO 3 ) 2 ·6H 2 O, SeO 2 , and respective amine. Since SeO 2 transforms to weak selenous acid in water, the low dissociation ability of the latter [62] and the presence of [NO 3 ] − groups in the structures of both compounds explains the long crystallization process of 1 to 2 months.…”

Section: Synthetic Uranyl Compounds With Selenite Ionsmentioning

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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Section: Synthetic Uranyl Compounds With Selenite Ionsmentioning

confidence: 99%

Crystal Chemistry and Structural Complexity of Natural and Synthetic Uranyl Selenites

et al. 2019

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ChemInform Abstract: Synthesis, Structure, and Photoluminescence Properties of an Organically‐Templated Uranyl Selenite.

Kuang

Chen

et al. 2015

ChemInform

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Organically Templated Uranyl Sulfates and Selenates: Structural Complexity and Crystal Chemical Restrictions for Isotypic Compounds Formation

Durova,

Kuporev,

Gurzhiy

2023

IJMS

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This paper reviews the state of the art in the structural chemistry of organically templated uranyl sulfates and selenates, which are considered as the most representative groups of U-bearing synthetic compounds. In total, there are 194 compounds known for both groups, the crystal structures of which include 84 various organic molecules. Structural studies and topological analysis clearly indicate complex crystal chemical limitations in terms of the isomorphic substitution implementation, since the existence of isotypic phases has to date been confirmed only for 24 compounds out of 194, which is slightly above 12%. The structural architecture of the entire compound depends on the combination of the organic and oxyanion parts, changes in which are sometimes realized even while maintaining the topology of the U-bearing complex. An increase in the size of the hydrocarbon part and number of charge functional groups of the organic cation leads to the formation of rare and more complex topologies. In addition, the crystal structures of two novel uranyl sulfates and one uranyl selenate, templated by isopropylammonium cations, are reported.

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Synthesis, Structure, and Photoluminescence Properties of an Organically‐Templated Uranyl Selenite

Cited by 3 publications

References 42 publications

Crystal Chemistry and Structural Complexity of Natural and Synthetic Uranyl Selenites

Crystal Chemistry and Structural Complexity of Natural and Synthetic Uranyl Selenites

ChemInform Abstract: Synthesis, Structure, and Photoluminescence Properties of an Organically‐Templated Uranyl Selenite.

Organically Templated Uranyl Sulfates and Selenates: Structural Complexity and Crystal Chemical Restrictions for Isotypic Compounds Formation

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