Neptunium(V) Oxide
Neptunium(V) oxide or neptunium pentoxide is one of two stable oxides of neptunium, the other being neptunium(IV) oxide. It has a chemical formula of Np2O5. History Neptunium(V) oxide was first synthesized in 1963 by passing ozone through molten lithium perchlorate containing neptunyl, neptunyl(V) ions and precipitating the product. Formation Neptunium(V) oxide can be formed from the calcination of other compounds of neptunium, such as neptunium(VI) oxide (NpO3·''x''H2O), neptunyl(V) hydroxide (NpO2OH), neptunyl(VI) hydroxide (NpO2(OH)2), or neptunium(V) nitrates (NpO(NO3)3 or NpO2NO3).Lemire, R. J. et al., ''Chemical Thermodynamics of Neptunium and Plutonium'', Elsevier, Amsterdam, 2001. It can also be formed from the precipitation of neptunyl ions in solution: : Reactions Neptunium(V) oxide decomposes at 700 K, forming neptunium(IV) oxide and oxygen gas: : Np2O5 produced from the calcination of neptunyl(VI) hydroxide goes through an intermediate phase Np4O9 befo ...
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Neptunium(V) Fluoride
Neptunium(V) fluoride or neptunium pentafluoride is a chemical compound of neptunium and fluorine with the chemical formula, formula NpF5. Synthesis Neptunium(V) fluoride can be prepared by reacting neptunium(VI) fluoride with iodine: : 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 hydrogen fluoride, HF to produce LiNpF6. References

Neptunium compounds Fluorides Actinide halides {{inorganic-compound-stub ...
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