Uranyl oxalate

Uranyl oxalate

Names
Other names Uranyl oxalate trihydrate; uranyl oxalate hydrate
Identifiers
CAS Number	2031-89-2
3D model (JSmol)	Interactive image
ChemSpider	11588161
PubChem CID	22717423
CompTox Dashboard (EPA)	DTXSID40942455
InChI InChI=1S/C2H2O4.2O.U/c3-1(4)2(5)6;;;/h(H,3,4)(H,5,6);;;/q;;;+2/p-2 Key: PRWGGWFEEGTKSV-UHFFFAOYSA-L
SMILES C(=O)(C(=O)[O-])[O-].O=[U+2]=O
Properties
Chemical formula	UO2C2O4
Molar mass	358 g/mole (412 g/mol as trihydrate)
Appearance	Pale yellow powder
Solubility in water	Partially soluble
Related compounds
Related uranium oxides	Uranyl peroxide Triuranium octoxide Uranium dioxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Uranyl oxalate (UO₂C₂O₄) is a pale yellow powdered uranyl salt. It is often encountered in industrial nuclear processes at both the front and back-end of the nuclear fuel cycle. Due to its hygroscopicity, uranyl oxalate rarely exists in the dehydrated state and is usually instead found in the trihydrate form (UO₂C₂O₄·3H₂O) at room temperature. ^[1] At room temperature, the powder exhibits a monoclinic crystal structure in the P2₁/c space group. ^[2]

Production

Uranyl oxalate trihydrate can be produced by the reaction of uranyl nitrate hexahydrate with oxalic acid. ^[3]

Uranyl oxalate has been used in actinometers. ^[4]

References

1. Thompson, Nathan B. A.; Stennett, Martin C.; Gilbert, Matthew R.; Hyatt, Neil C. (2021-01-06). "Nuclear forensic signatures and structural analysis of uranyl oxalate, its products of thermal decomposition and Fe impurity dopant". Journal of Radioanalytical and Nuclear Chemistry. 327 (2): 957–973. doi: 10.1007/s10967-020-07538-2 . ISSN   0236-5731.
2. Jayadevan, N. C.; Chackraburtty, D. M. (1972-11-15). "The crystal and molecular structure of uranyl oxalate trihydrate". Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 28 (11): 3178–3182. Bibcode:1972AcCrB..28.3178J. doi:10.1107/s0567740872007691. ISSN   0567-7408.
3. Tel, H; Bülbül, M; Eral, M; Altaş, Y (November 1999). "Preparation and characterization of uranyl oxalate powders" . Journal of Nuclear Materials. 275 (2): 146–150. Bibcode:1999JNuM..275..146T. doi:10.1016/s0022-3115(99)00119-1. ISSN   0022-3115.
4. Bryce-Smith, D. (1971). Photochemistry. Royal Society of Chemistry. p. 279. ISBN   978-0-85186-015-2.