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

^ 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.
^ 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.
^ 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.
^ Bryce-Smith, D. (1971). Photochemistry. Royal Society of Chemistry. p. 279. ISBN 978-0-85186-015-2.

[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.

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