Neptunium(V) fluoride or neptunium pentafluoride is a chemical compound of neptunium and fluorine with the formula NpF5.
Names | |
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IUPAC name
Neptunium(V) fluoride
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Other names
Neptunium pentafluoride
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Identifiers | |
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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)
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0.1904 nm3 |
Formula units (Z)
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2 |
Thermochemistry | |
Heat capacity (C)
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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⦵)
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-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
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Neptunium(V) fluoride can be prepared by reacting neptunium(VI) fluoride with iodine:[1]
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]