Nitrosonium hexafluorouranate

Nitrosonium hexafluorouranate
Properties
Chemical formula	F6NOU
Molar mass	382.025 g·mol−1
Appearance	bluish-green solid
Density	4.4954 g/cm3
Structure
Crystal structure	cubic
Space group	Ia3 (No. 206)
Lattice constant	a = 10.3480 Å α = 90°, β = 90°, γ = 90°
Lattice volume (V)	1108.07 Å3
Formula units (Z)	8 units per cell
Related compounds
Other anions	Nitrosonium hexafluoroantimonate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Nitrosonium hexafluorouranate is an inorganic compound with the chemical formula NOUF
₆, composed of the nitrosonium cation [NO]⁺ and hexafluorouranate anion [UF₆]^-. It is a bluish-green solid, forming cubic crystals.

Preparation

Nitrosonium hexafluorouranate can be prepared by reacting uranium hexafluoride with nitric oxide or nitrogen dioxide.^[2]^[3] The reaction can also be performed in anhydrous HF.^[1]

Reactions

Nitrosonium hexafluorouranate, when combined with alkali metal nitrates from lithium to cesium (denoted by M), reacts to form the corresponding alkali metal hexafluorouranate along with two nitrogen dioxide molecules.^[4]

NOUF₆(s) + M NO₃(s) M UF₆(s) + 2NO₂(g)

M = Li − Cs

References

1 2 3 Scheibe, Benjamin; Lippert, Sina; Rudel, Stefan S.; Buchner, Magnus R.; Burghaus, Olaf; Pietzonka, Clemens; Koch, Martin; Karttunen, Antti J.; Kraus, Florian (2016-08-16). "NOUF 6 Revisited: A Comprehensive Study of a Hexafluoridouranate(V) Salt". Chemistry – A European Journal. 22 (34): 12145–12153. doi:10.1002/chem.201602265. ISSN 0947-6539.
↑ Eller, P. Gary; Malm, John G.; Swanson, Basil I.; Morss, Lester R. (1998-05-01). "Reactions of hexafluorides of uranium, neptunium, and plutonium with nitrogen oxides and oxyfluorides. Synthesis and characterization of (NO)[NpF6] and (NO)[PuF6]". Journal of Alloys and Compounds. 269 (1): 50–56. doi:10.1016/S0925-8388(98)00155-8. ISSN 0925-8388.
↑ "Nitrosylium Hexafluorouranate (NOUF6) and Its Derivatives". pubs.acs.org. doi:10.1021/acs.inorgchem.6c00058. Retrieved 2026-04-23.
↑ Scheibe, Benjamin; Wassermann, Tobias B.; Kraus, Florian (2025-09-15). "Syntheses, Single-Crystal Structures, and Structural Chemistry of Hexafluoridouranates(V), MUF6 (M = Li-Cs, Ag, Tl, H3O), and the Dodecafluoridodiuranate(V) Ba[U2F12]·1.36HF". Inorganic Chemistry. 64 (36): 18432–18446. doi:10.1021/acs.inorgchem.5c03005. ISSN 1520-510X. PMC 12442095. PMID 40904026.

[Scheibe-1] 1 2 3 Scheibe, Benjamin; Lippert, Sina; Rudel, Stefan S.; Buchner, Magnus R.; Burghaus, Olaf; Pietzonka, Clemens; Koch, Martin; Karttunen, Antti J.; Kraus, Florian (2016-08-16). "NOUF 6 Revisited: A Comprehensive Study of a Hexafluoridouranate(V) Salt". Chemistry – A European Journal. 22 (34): 12145–12153. doi:10.1002/chem.201602265. ISSN 0947-6539.

[2] Eller, P. Gary; Malm, John G.; Swanson, Basil I.; Morss, Lester R. (1998-05-01). "Reactions of hexafluorides of uranium, neptunium, and plutonium with nitrogen oxides and oxyfluorides. Synthesis and characterization of (NO)[NpF6] and (NO)[PuF6]". Journal of Alloys and Compounds. 269 (1): 50–56. doi:10.1016/S0925-8388(98)00155-8. ISSN 0925-8388.

[3] "Nitrosylium Hexafluorouranate (NOUF6) and Its Derivatives". pubs.acs.org. doi:10.1021/acs.inorgchem.6c00058. Retrieved 2026-04-23.

[4] Scheibe, Benjamin; Wassermann, Tobias B.; Kraus, Florian (2025-09-15). "Syntheses, Single-Crystal Structures, and Structural Chemistry of Hexafluoridouranates(V), MUF6 (M = Li-Cs, Ag, Tl, H3O), and the Dodecafluoridodiuranate(V) Ba[U2F12]·1.36HF". Inorganic Chemistry. 64 (36): 18432–18446. doi:10.1021/acs.inorgchem.5c03005. ISSN 1520-510X. PMC 12442095. PMID 40904026.

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