Chemistry:Neptunium(V) fluoride

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Neptunium(V) fluoride
IUPAC name
Neptunium(V) fluoride
Other names
Neptunium pentafluoride
3D model (JSmol)
Molar mass 332 g/mol
Appearance Bluish-white solid[1]
Melting point 318 °C [1] (dec.)
Tetragonal, tI12[1]
I4/m, No. 87[2]
a = 0.65358 nm, c = 0.44562 nm
0.1904 nm3
133 ± 8 J/mol·K[1]
200 ± 15 J/mol·K[1]
−1941 ± 25 kJ/mol[1]
-1834 ± 25 kJ/mol[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Neptunium(V) fluoride or neptunium pentafluoride is a chemical compound of neptunium and fluorine with the formula NpF5.


Neptunium(V) fluoride can be prepared by reacting neptunium(VI) fluoride with iodine:[1]

[math]\displaystyle{ \mathrm{10\ NpF_6\ +\ I_2\ \longrightarrow \ 10\ NpF_5\ +\ 2\ IF_5} }[/math]

From the equation above, iodine pentafluoride is a byproduct.


Neptunium(V) fluoride thermally decomposes at 318 °C to produce neptunium(IV) fluoride and neptunium(VI) fluoride. Contrary to uranium(V) fluoride, neptunium(V) fluoride does not react with boron trichloride, but it reacts with lithium fluoride in anhydrous HF to produce LiNpF6.[1]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Haire, Richard G. (2006). "Neptunium". in Morss; Edelstein, Norman M.; Fuger, Jean. The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. pp. 730–736. doi:10.1007/1-4020-3598-5_9. ISBN 1-4020-3555-1. 
  2. Zachariasen, W. H. (1949). "Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types". Acta Crystallographica 2 (6): 388–390. doi:10.1107/S0365110X49001016.