Neptunyl fluoride

Neptunyl fluoride
Names
	Other names Neptunium(VI) fluoride oxide; Neptunium difluoride dioxide;
Identifiers
CAS Number	18720-78-0 ;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/2FH.Np.2O/h2*1H;;;/q;;+2;;/p-2 Key: BPVQATDOABEXKQ-UHFFFAOYSA-L;
	SMILES O=[Np](F)(F)=O;
Properties
Chemical formula	NpO2F2
Molar mass	307 g·mol−1
Appearance	pink solid
Solubility in water	soluble
Related compounds
Other cations	Plutonyl fluoride; Uranyl fluoride;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Neptunyl fluoride is an inorganic compound of neptunium, oxygen, and fluorine with the chemical formula NpO₂F₂.^[1]^[2]

Synthesis

Neptunyl fluoride can be obtained by the reaction of the hydrated trioxide with gaseous HF and by direct fluorination of Np₂O₅ at 350 °C or NpO₃·H₂O at 225 °C.^[3]

Physical properties

The compound forms a pink solid^[3] of hexagonal crystal system, spatial group R3m.^[4]^[5] Soluble in water, insoluble in common organic solvents.^[1]

References

^ ^a ^b Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3153. ISBN 978-0-412-30120-9. Retrieved 29 September 2025.
^ Ohwada, Ken (1 June 1971). "Uranium-fluorine lattice vibration of uranyl fluoride". Journal of Inorganic and Nuclear Chemistry. 33 (6): 1615–1623. doi:10.1016/0022-1902(71)80596-1. ISSN 0022-1902. Retrieved 29 September 2025.
^ ^a ^b Advances in Inorganic Chemistry. Academic Press. 5 December 1984. p. 91. ISBN 978-0-08-057877-4. Retrieved 29 September 2025.
^ Donnay, Joseph Désiré Hubert (1973). Crystal Data: Inorganic compounds. National Bureau of Standards. p. 289. Retrieved 29 September 2025.
^ Nowacki, J. D. H. Donnay, and Werner (1954). Crystal Data: Classification of Substances by Space Groups and their Identification from Cell Dimensions. Geological Society of America. p. 459. ISBN 978-0-8137-1060-0. Retrieved 29 September 2025. {{cite book}}: ISBN / Date incompatibility (help)CS1 maint: multiple names: authors list (link)

[CRC-1] Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3153. ISBN 978-0-412-30120-9. Retrieved 29 September 2025.

[2] Ohwada, Ken (1 June 1971). "Uranium-fluorine lattice vibration of uranyl fluoride". Journal of Inorganic and Nuclear Chemistry. 33 (6): 1615–1623. doi:10.1016/0022-1902(71)80596-1. ISSN 0022-1902. Retrieved 29 September 2025.

[AIC-3] Advances in Inorganic Chemistry. Academic Press. 5 December 1984. p. 91. ISBN 978-0-08-057877-4. Retrieved 29 September 2025.

[4] Donnay, Joseph Désiré Hubert (1973). Crystal Data: Inorganic compounds. National Bureau of Standards. p. 289. Retrieved 29 September 2025.

[5] Nowacki, J. D. H. Donnay, and Werner (1954). Crystal Data: Classification of Substances by Space Groups and their Identification from Cell Dimensions. Geological Society of America. p. 459. ISBN 978-0-8137-1060-0. Retrieved 29 September 2025. {{cite book}}: ISBN / Date incompatibility (help)CS1 maint: multiple names: authors list (link)

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