Neptunium(IV) nitrate

Neptunium(IV) nitrate is an inorganic compound, a salt of neptunium and nitric acid with the chemical formula Np(NO₃)₄.^[1][2][3] The compound forms gray crystals, dissolves in water, and forms crystal hydrates.^[4][5]

Neptunium(IV) nitrate

Names
Other names Neptunium tetranitrate
Identifiers
CAS Number	25933-55-5^Y
3D model (JSmol)	Interactive image
ECHA InfoCard	100.043.033
EC Number	247-352-3
PubChem CID	3015250
InChI InChI=1S/4NO3.Np/c4*2-1(3)4;/q4*-1; Key: XHXJHKCJMVVEJC-UHFFFAOYSA-N
SMILES [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[Np]
Properties
Chemical formula	Np(NO3)4
Molar mass	485.02
Appearance	Grey crystals
Solubility in water	Soluble
Hazards
GHS labelling:
Signal word	Warning
Related compounds
Related compounds	Plutonium(IV) nitrate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Addition of dilute nitric acid to freshly prepared neptunium(IV) hydroxide:^[6][7]

${\displaystyle {\mathsf {Np(OH)_{4}+4HNO_{3}\ {\xrightarrow {}}\ Np(NO_{3})_{4}+4H_{2}O}}}$ 

Physical properties

Neptunium(IV) nitrate forms gray hygroscopic crystals.

It is soluble in water.

It forms a crystal hydrate of the composition Np(NO₃)₄•2H₂O.

References

1. Horner, D. E. (1961). Plutonium Extraction from Nitrate and Sulfate Solutions by Amines and Organophosphorus Compounds. Oak Ridge National Laboratory. p. 17. Retrieved 17 August 2021.
2. Ikeda-Ohno, Atsushi; Hennig, Christoph; Rossberg, André; Funke, Harald; Scheinost, Andreas C.; Bernhard, Gert; Yaita, Tsuyoshi (15 September 2008). "Electrochemical and Complexation Behavior of Neptunium in Aqueous Perchlorate and Nitrate Solutions". Inorganic Chemistry. 47 (18): 8294–8305. doi:10.1021/ic8009095. ISSN 0020-1669. PMID 18698766. Retrieved 17 August 2021.
3. Guillaume, B.; Moulin, J.P.; Maurice, Ch. (27–29 November 1984). "CHEMICAL PROPERTIES OF NEPTUNIUM APPLIED TO NEPTUNIUM MANAGEMENT IN EXTRACTION CYCLES OF PUREX PROCESS" (PDF). Retrieved 17 August 2021.
4. Alian, A.; Haggag, A. (1 May 1967). "Amine extraction and determination of activity coefficients of neptunium and plutonium nitrates". Journal of Inorganic and Nuclear Chemistry. 29 (5): 1355–1363. doi:10.1016/0022-1902(67)80378-6. ISSN 0022-1902. Retrieved 17 August 2021.
5. Koltunov, V. S.; Taylor, R. J.; Savilova, O. A.; Zhuravleva, G. I.; Denniss, I. S.; Wallwork, A. L. (1 January 1997). "Kinetics and Mechanism of the Oxidation of Neptunium(IV) by Nitric Acid in Tributyl Phosphate Solution". Radiochimica Acta. 76 (1–2): 45–54. doi:10.1524/ract.1997.76.12.45. ISSN 2193-3405. S2CID 99652660. Retrieved 18 August 2021.
6. Seaborg, Glenn Theodore (1949). The Transuranium Elements: Research Papers. McGraw-Hill. p. 1102. ISBN 9780598917584. Retrieved 17 August 2021.
7. Laidler, J. B. (1 January 1966). "Neptunium nitrates". Journal of the Chemical Society A: Inorganic, Physical, Theoretical: 780–784. doi:10.1039/J19660000780. ISSN 0022-4944. Retrieved 18 August 2021.