Names | |
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IUPAC name Neptunium(V) fluoride | |
Other names Neptunium pentafluoride | |
Identifiers | |
3D model (JSmol) | |
PubChem CID | |
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 | |
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). |
Neptunium(V) fluoride or neptunium pentafluoride is a chemical compound of neptunium and fluorine with the formula NpF5.
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]