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Chemical compound From Wikipedia, the free encyclopedia
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]
Names | |
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IUPAC name
Neptunium(IV) fluoride | |
Other names
Neptunium tetrafluoride | |
Identifiers | |
3D model (JSmol) |
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PubChem CID |
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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).
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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]
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