Names | |
---|---|
IUPAC name
Neptunium(IV) fluoride
| |
Other names
Neptunium tetrafluoride
| |
Identifiers | |
3D model (
JSmol)
|
|
PubChem
CID
|
|
| |
| |
Properties | |
NpF4 | |
Molar mass | 313 g/mol |
Appearance | Green solid [1] |
Structure | |
Monoclinic, mS60 [1] | |
C2/c, No. 15 [2] | |
a = 1.27 nm, b = 1.0082 nm, c = 0.833 nm α = 90°, β = 126.03°, γ = 90°
| |
Lattice volume (V)
|
0.86256 nm3 |
Formula units (Z)
|
12 |
Thermochemistry | |
Heat capacity (C)
|
116 ± 4 J/mol·K [1] |
Std molar
entropy (S⦵298) |
148 ± 3 J/mol·K [1] |
Std enthalpy of
formation (ΔfH⦵298) |
−1874 ± 16 kJ/mol [1] |
Gibbs free energy (ΔfG⦵)
|
-1783 ± 16 kJ/mol [1] |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Neptunium(IV) fluoride or neptunium tetrafluoride is a inorganic compound with the formula NpF4. It is a green salt and is isostructural with UF4. [3]
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: [1]
It can also be prepared by treating neptunium dioxide with HF gas: [1]