Neptunium(V) fluoride or neptunium pentafluoride is a chemical compound of neptunium and fluorine with the formula NpF5.
| Names | |
|---|---|
| IUPAC name
Neptunium(V) fluoride
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| Other names
Neptunium pentafluoride
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| Identifiers | |
3D model (JSmol)
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CompTox Dashboard (EPA)
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| Properties | |
| NpF5 | |
| Molar mass | 332 g/mol |
| Appearance | Bluish-white solid[1] |
| Melting point | 318 °C[1] (dec.) |
| Structure | |
| Tetragonal, tI12[1] | |
| I4/m, No. 87[2] | |
a = 0.65358 nm, c = 0.44562 nm
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Lattice volume (V)
|
0.1904 nm3 |
Formula units (Z)
|
2 |
| Thermochemistry | |
Heat capacity (C)
|
133 ± 8 J/mol·K[1] |
Std molar
entropy (S⦵298) |
200 ± 15 J/mol·K[1] |
Std enthalpy of
formation (ΔfH⦵298) |
−1941 ± 25 kJ/mol[1] |
Gibbs free energy (ΔfG⦵)
|
-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).
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Synthesis
editNeptunium(V) fluoride can be prepared by reacting neptunium(VI) fluoride with iodine:[1]
From the equation above, iodine pentafluoride is a byproduct.
Properties
editNeptunium(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]
References
edit- ^ 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.
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