Speckled Alder – Alnus incana

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:^[1]

\mathrm {10\ NpF_{6}\ +\ I_{2}\ \longrightarrow \ 10\ NpF_{5}\ +\ 2\ IF_{5}}

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]

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Haire, Richard G. (2006). "Neptunium". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). 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.
^ 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.