Neptunium hexafluoride

Neptunium hexafluoride^[1]

Names
IUPAC name Neptunium(VI) fluoride
Identifiers
CAS Number	14521-05-2
Jmol interactive 3D	Image
PubChem	19695135
InChI InChI=1S/6FH.Np/h6*1H;/q;;;;;;+6/p-6
SMILES F[Np](F)(F)(F)(F)F
Properties
Chemical formula	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
Crystal structure	Orthorhombic, oP28
Space group	Pnma, No. 62
Coordination geometry	octahedral (Oh)
Dipole moment	0 D
Related compounds
Related fluoroNeptuniums	Neptunium trifluoride Neptunium tetrafluoride
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 an orange volatile crystalline solid.^[1] It is relatively hard to handle, being very corrosive and radioactive. 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

It can also be obtained by fluorination of neptunium(III) fluoride.^[3]

2 NpF
3 + 3 F
2 → 2 NpF
6

References

1. Gmelins Handbuch der anorganischen Chemie, System Nr. 71, Transurane, Teil C, p. 108–114.
2. 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).
3. Sherman Fried, Norman Davidson: „The Preparation of Solid Neptunium Compounds“, J. Am. Chem. Soc., 1948, 70 (11), p. 3539–3547 (doi:10.1021/ja01191a003).