Neptunium(VI) fluoride

Neptunium(VI) fluoride
Names
	IUPAC name Neptunium(VI) fluoride
	Other names Neptunium hexafluoride
Identifiers
CAS Number	14521-05-2 ;
3D model (JSmol)	Interactive image;
PubChem CID	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	351 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
Thermochemistry
Std molar; entropy (S⦵298)	229.1 ± 0.5 J·K−1·mol−1
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). (what is ?) Infobox references

Neptunium(VI) fluoride (NpF₆) is the highest fluoride of neptunium, it is also one of seventeen known binary hexafluorides. It is an orange volatile crystalline solid. It is relatively hard to handle, being very corrosive, volatile and radioactive. Neptunium hexafluoride is stable in dry air but reacts vigorously with water.

At normal pressure, it melts at 54.4 °C and boils at 55.18 °C. It is the only neptunium compound that boils at a low temperature. Due to these properties, it is possible to easily separate neptunium from spent fuel.

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