Neptunium(V) fluoride

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

Synthesis

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

$\mathrm{1}\mathrm{0}\mathrm{N}\mathrm{p}{\mathrm{F}}_{\mathrm{6}}\mathrm{+}{\mathrm{I}}_{\mathrm{2}}\mathrm{⟶}\mathrm{1}\mathrm{0}\mathrm{N}\mathrm{p}{\mathrm{F}}_{\mathrm{5}}\mathrm{+}\mathrm{2}\mathrm{I}{\mathrm{F}}_{\mathrm{5}}$

From the equation above, iodine pentafluoride is a byproduct.

Properties

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.