Neptunium trifluoride

Neptunium(III) fluoride
Names
IUPAC name Neptunium(III) fluoride
Other names Neptunium trifluoride
Identifiers
CAS Number	16852-37-2
3D model (JSmol)	Interactive image
InChI InChI=1S/Np.3FH/h;3*1H/q+3;;;/p-3^Y
SMILES F[Np](F)F
Properties
Chemical formula	NpF₃
Molar mass	294 g/mol
Appearance	Purple solid
Structure
Crystal structure	Trigonal, hP8
Space group	P6₃/mmc, No. 194
Lattice constant	a = 0.7129 nm, c = 0.7288 nm
Lattice volume (V)	0.32077 nm³
Formula units (Z)	6
Thermochemistry
Specific heat capacity (C)	94 ± 3 J/mol·K
Std molar entropy (S^o₂₉₈)	131 ± 3 J/mol·K
Std enthalpy of formation (Δ_fH^o₂₉₈)	−1529 ± 8 kJ/mol
Gibbs free energy (Δ_fG˚)	-1461 ± 8 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Neptunium(III) fluoride or neptunium trifluoride is a chemical compound of neptunium and fluorine with the formula NpF₃.

Neptunium(III) fluoride can be prepared by reacting neptunium dioxide with a gas mixture of hydrogen and hydrogen fluoride at 500 °C: