Preparation, IR and thermal studies of thorium peroxide species

Jere, G.V.; Santhamma, M. T.

doi:10.1016/0022-5088(77)90202-8

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…4.2 Thermal decomposition behavior and the ability of the actinide peroxide salts to produce mixed oxide powder Heat treatment of actinide peroxides confirms their low stability and high ability as oxide precursors. In agreement with the thermal decomposition scheme of actinide peroxide or actinide nitrate phases, 49,75,76 volatile species, such as water molecules, (O 2 ) 2− ligands, and (NO 3 ) − are successively decomposed and released to result in a mixture of binary oxide phases at about 350 °C. The morphological properties of the grains slightly evolve for heat-treatment as high as 800 °C.…”

Section: Dalton Transactions Papersupporting

confidence: 54%

“…According to Leary [45] and Leary et al [46], the improvement of the filtration properties, can be ascribed to a polymorphic transition of the Pu peroxo-nitrate salt from a cubic form to an hexagonal form at nitric Heat treatment of actinide peroxides confirms their low stability and high ability as oxide precursors. In agreement with the thermal decomposition scheme of actinide peroxide or actinide nitrate phases [49,75,76], volatile species, such as water molecules, (O 2 ) 2ligands, and (NO 3 )are successively decomposed and released to result in a mixture of binary oxide phases at about 350°C.…”

Section: Discussionmentioning

confidence: 60%

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Coprecipitation of actinide peroxide salts in the U–Th and U–Pu systems and their thermal decomposition

HIBERT

Arab-Chapelet

Rivenet³

et al. 2022

Dalton Trans.

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Section: Dalton Transactions Papersupporting

confidence: 54%

Section: Discussionmentioning

confidence: 60%

Coprecipitation of actinide peroxide salts in the U–Th and U–Pu systems and their thermal decomposition

HIBERT

Arab-Chapelet

Rivenet³

et al. 2022

Dalton Trans.

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“…In fact, the formation of actinide peroxides has been used to separate thorium from uranium for nearly 5 decades via the precipitation of a thorium peroxide compound, while leaving the uranium in solution. Despite the utility of this method, this precipitate remains poorly characterized, − and a well-defined thorium peroxide compound or complex remains elusive. Herein we show that radiolytic reactions from aged sources of thorium with water lead to the formation of a trinuclear thorium peroxide cluster that can be isolated through the use of capping ligands that inhibit agglomeration and precipitation.…”

mentioning

confidence: 99%

Understanding the Scarcity of Thorium Peroxide Clusters

et al. 2017

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The reaction of Th(NO)·5HO with 3 equiv of 2,2',6',2″-terpyridine (terpy) in a mixture of acetonitrile and methanol results in formation of the trinuclear thorium peroxide cluster [Th(O)(terpy)(NO)]. This cluster is assembled via bridging by μ-η:η peroxide anions between thorium centers. It decomposes upon removal from the mother liquor to yield Th(terpy)(NO) and Th(terpy)(NO)(EtOH). The peroxide formation appears to be radiolytic in origin and is, most likely, generated from radiolysis of water by short-lived daughters generated from Th decay. This cluster does not form when freshly recrystallized Th(NO)·5HO is used as the starting material and requires an aged source of thorium. Analysis of the bonding in these clusters shows that, unlike uranium(VI) peroxide interactions, thorium(IV) complexation by peroxide is quite weak and largely ionic. This explains its much lower stability, which is more comparable to that observed in similar zirconium(IV) peroxide clusters.

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Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate

Bonato

Virot

Dumas

et al. 2019

Chemistry A European J

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The preparation and structural characterization of an original Th peroxo sulfate dihydrate, crystallizing at room temperature in the form of stable 1D polymeric microfibres is described. A combination of laboratory and synchrotron techniques allowed solution of the structure of the Th(O2)(SO4)(H2O)2 compound, which crystallizes in a new structure type in the space group Pna21 of the orthorhombic crystal system. Particularly, the peroxide ligand coordinates to the Th cations in an unusual μ3‐η2:η2:η2 bridging mode, forming an infinite 1D chain decorated with sulfato ligands exhibiting simultaneously monodentate and bidentate coordination modes.

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Preparation, IR and thermal studies of thorium peroxide species

Cited by 6 publications

References 6 publications

Coprecipitation of actinide peroxide salts in the U–Th and U–Pu systems and their thermal decomposition

Coprecipitation of actinide peroxide salts in the U–Th and U–Pu systems and their thermal decomposition

Understanding the Scarcity of Thorium Peroxide Clusters

Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate

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