Neptunium(IV) oxalate

Neptunium(IV) oxalate

Identifiers
CAS Number	20196-48-9^Y
3D model (JSmol)	Interactive image
PubChem CID	87766684
InChI InChI=1S/2C2H2O4.Np/c2*3-1(4)2(5)6;/h2*(H,3,4)(H,5,6);/p-4 Key: SSEVUKNDQSENCR-UHFFFAOYSA-J
SMILES C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Np]
Properties
Chemical formula	Np(C2O4)2
Molar mass	413.04
Appearance	Green crystals
Solubility in water	slightly soluble
Hazards
GHS labelling:
Signal word	Danger
Related compounds
Related compounds	Thorium dioxalate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Neptunium (IV) oxalate^[1] is an inorganic compound, a salt of neptunium and oxalic acid with the chemical formula Np(C₂O₄)₂.^[2] The compound is slightly soluble in water, forms crystalline hydrates—green crystals.^[3][4]

Synthesis

Neptunium(IV) oxalate is formed by the oxalic acid precipitation of neptunium (IV) solutions:^[5]

${\displaystyle {\mathsf {NpCl_{4}+2H_{2}C_{2}O_{4}\ {\xrightarrow {}}\ Np(C_{2}O_{4})_{2}\cdot 6H_{2}O\downarrow +4HCl}}}$

Physical properties

Neptunium(IV) oxalate forms a crystalline hydrate of the composition Np(C₂O₄)₂ • 6H₂O with green crystals.

It is insoluble in acetone, and slightly soluble in water.^[6]

Chemical properties

Neptunium(IV) oxalate decomposes on heating:^[7]

${\displaystyle {\mathsf {Np(C_{2}O_{4})_{2}\ {\xrightarrow {400^{o}C}}\ NpO_{2}+2CO_{2}+2CO}}}$

Applications

Neptunium(IV) oxalate is used as an intermediate product in the purification of neptunium.^[8][9]

References

1. Alburger, D. E.; Perlman, I.; Rasmussen, J. O.; Hyde, Earl K.; Seaborg, Glenn T.; Bishop, George R.; Wilson, Richard; Devons, S.; Goldfarb, L. J. B.; Blin-Stoyle, R. J.; Grace, M. A. (6 December 2012). Kernreaktionen III / Nuclear Reactions III. Springer Science & Business Media. p. 234. ISBN 978-3-642-45878-1. Retrieved 6 August 2021.
2. Лидин, Ростислав; Молочко, Вадим; Андреева, Лариса (2 February 2019). Константы неорганических веществ. Справочник (in Russian). Litres. p. 52. ISBN 978-5-04-077039-7. Retrieved 6 August 2021.
3. Luerkens, D. W. (1 July 1983). Neptunium (IV) oxalate solubility. [22, 45, 60/sup 0/C]. doi:10.2172/5904308. Retrieved 6 August 2021.
4. Encyclopedia of physics. Springer-Verlag. 1957. p. 234. Retrieved 6 August 2021.
5. Luerkens, D. W. (1983). "Two-stage precipitation of neptunium (IV) oxalate". Du Pont de Nemours (E.I.) and Co. Retrieved 6 August 2021. {{cite journal}}: Cite journal requires |journal= (help)
6. Luerkens, D. W. (1983). "Neptunium (IV) oxalate solubility. [22, 45, 60/sup 0/C]". Savannah River Laboratory; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. Retrieved 6 August 2021. {{cite journal}}: Cite journal requires |journal= (help)
7. Kozlova, R. D.; Karelin, A. I.; Lobas, O. P.; Matyukha, V. A. (1984). "Thermal decomposition of neptunium (4) oxalate". Radiokhimiya (in Russian). 26 (3): 311–316. ISSN 0033-8311. Retrieved 6 August 2021.
8. Бекман, Игорь (2 July 2021). Неорганическая химия. Радиоактивные элементы 2-е изд., испр. и доп. Учебник для СПО (in Russian). Litres. p. 272. ISBN 978-5-04-309059-1. Retrieved 6 August 2021.
9. Morss, L. R.; Edelstein, Norman M.; Fuger, Jean (21 October 2010). The Chemistry of the Actinide and Transactinide Elements (Set Vol.1-6): Volumes 1-6. Springer Science & Business Media. p. 726. ISBN 978-94-007-0211-0. Retrieved 6 August 2021.