Neptunium(IV) fluoride
| Names | |
|---|---|
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IUPAC name
Neptunium(IV) fluoride
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|
| Other names
Neptunium tetrafluoride
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| Identifiers | |
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| Properties | |
| NpF3 | |
| Molar mass | 313 g/mol |
| Appearance | Green solid |
| Structure | |
| Monoclinic, mS60 | |
| C2/c, No. 15 | |
|
a = 1.27 nm, b = 1.0082 nm, c = 0.833 nm
α = 90°, β = 126.03°, γ = 90°
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|
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Lattice volume (V)
|
0.86256 nm3 |
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Formula units (Z)
|
12 |
| Thermochemistry | |
| 116 ± 4 J/mol·K | |
|
Std molar
entropy (S |
148 ± 3 J/mol·K |
|
Std enthalpy of
formation (ΔfH |
−1874 ± 16 kJ/mol |
|
Gibbs free energy (ΔfG˚)
|
-1783 ± 16 kJ/mol |
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Neptunium(IV) fluoride or neptunium tetrafluoride is a chemical compound of neptunium and fluorine with the formula NpF4.
Neptunium(IV) fluoride can be prepared by reacting neptunium(III) fluoride or neptunium dioxide with a gas mixture of oxygen and hydrogen fluoride at 500 °C:
It can also be prepared by treating neptunium dioxide with HF gas:
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