Neptunium(VI) fluoride
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| Names | |
|---|---|
| IUPAC name
Neptunium(VI) fluoride | |
| Identifiers | |
3D model (JSmol) |
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PubChem CID |
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| Properties | |
| F6Np | |
| Molar mass | 350.99 g·mol−1 |
| Appearance | orange crystals |
| Melting point | 54.4 °C (129.9 °F; 327.5 K) |
| Boiling point | 55.18 °C (131.32 °F; 328.33 K) |
| Structure | |
| Orthorhombic, oP28 | |
| Pnma, No. 62 | |
| octahedral (Oh) | |
| 0 D | |
| Related compounds | |
Related fluoroNeptuniums |
Neptunium trifluoride |
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 hexafluoride (NpF6) is the highest fluoride of neptunium, it is also one of seventeen known binary hexafluorides. It is an orange volatile crystalline solid.[1] It is relatively hard to handle, being very corrosive, volatile and radioactive.
At normal pressure , it melts at 54.4 ° C and boils at 55.18 ° C. It is the only neptunium compound that is easily converted into the gas phase. Due to these properties, it is possible to separate neptunium from spent fuel . This quickly increased the interest in his presentation and in the exact examination of its properties.
Preparation
Usual method
It is prepared by fluorination of neptunium(IV) fluoride (NpF4) by powerful fluorinating agents such as elemental fluorine.[2]
- NpF
4 + F
2 → NpF
6
Other methods
It can also be obtained by fluorination of neptunium(III) fluoride.[3]
- 2 NpF
3 + 3 F
2 → 2 NpF
6
References
- 1 2 Gmelins Handbuch der anorganischen Chemie, System Nr. 71, Transurane, Teil C, p. 108–114.
- ↑ John G. Malm, Bernard Weinstock, E. Eugene Weaver: „The Preparation and Properties of NpF6; a Comparison with PuF6“, J. Phys. Chem., 1958, 62 (12), p. 1506–1508 (doi:10.1021/j150570a009).
- ↑ Sherman Fried, Norman Davidson: „The Preparation of Solid Neptunium Compounds“, J. Am. Chem. Soc., 1948, 70 (11), p. 3539–3547 (doi:10.1021/ja01191a003).