Uranyl oxalate

Uranyl oxalate  File:U Oxalate Trihydrate.tif

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

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. doi:10.1107/s0567740872007691. ISSN 0567-7408. Bibcode: 1972AcCrB..28.3178J.
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. doi:10.1016/s0022-3115(99)00119-1. ISSN 0022-3115. Bibcode: 1999JNuM..275..146T. http://dx.doi.org/10.1016/s0022-3115(99)00119-1.
4. ↑ Bryce-Smith, D. (1971) (in en). Photochemistry. Royal Society of Chemistry. p. 279. ISBN 978-0-85186-015-2. https://books.google.com/books?id=iy8xBTl-XjcC&pg=PA279.

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Uranium compounds

U(II)|

* UB2
* US

U(III)|

* UF3
* UCl3
* UI3
* UP
* U(OH)3
* UH3
* UN

| Organouranium(III) compounds|

* U(C5H5)3

|

U(IV)|

* U(BH4)4
* UCl4
* UF4
* UBr4
* UI4
* UO2
* USi2
* US2
* U(SO4)2

| Organouranium(IV) compounds|

* U(C8H8)2
* U(C5H5)4
* U(C5H5)3Cl

|

U(IV,V)|

* U2N3

U(V)|

* UCl5
* UF5
* UBr5
* UI5
* U2O5

U(V,VI)|

* U3O8

U(VI)|

* (NH4)2U2O7
* Na2U2O7
* UCl6
* UF6
* U(PO4)2
* UO3
* UO4
* UO2(CH3COO)2
* UO2(CHO2)2
* UO2CO3
* UO2CO3·2(NH4)2CO3
* UO2Cl2
* UO2F2
* UO2(NO3)2
* UO2(OH)2
* UO2(SO4)2
* ZnUO2(CH3COO)4
* UN2
* H2UO4
* UO6 (hypothetical)

U(XII)|

* UO6 (hypothetical)

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Oxalates

* (NH4)2C2O4
* BaC2O4
* CaC2O4
* Ce2(C2O4)3
* CrC2O4
* CoC2O4
* CuC2O4
* FeC2O4
* Fe2(C2O4)3
* PbC2O4
* MgC2O4
* Ag2C2O4
* Na2C2O4
* SrC2O4
* Th(C2O4)2

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