Neptunium(III) fluoride

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

Neptunium(III) fluoride

Names
IUPAC name Neptunium(III) fluoride
Other names Neptunium trifluoride
Identifiers
CAS Number	16852-37-2
3D model (JSmol)	Interactive image
PubChem CID	101946364 wrong charge
InChI InChI=1S/Np.3FH/h;3*1H/q+3;;;/p-3 Y Key: ZBOLUSKWQLLYDC-UHFFFAOYSA-K
SMILES F[Np](F)F
Properties
Chemical formula	NpF3
Molar mass	294 g/mol
Appearance	Purple solid[1]
Structure
Crystal structure	Trigonal, hP8[1]
Space group	P63/mmc, No. 194[2]
Lattice constant	a = 0.7129 nm, c = 0.7288 nm
Lattice volume (V)	0.32077 nm3
Formula units (Z)	6
Thermochemistry
Heat capacity (C)	94 ± 3 J/mol·K[1]
Std molar entropy (S⦵298)	131 ± 3 J/mol·K[1]
Std enthalpy of formation (ΔfH⦵298)	−1529 ± 8 kJ/mol[1]
Gibbs free energy (ΔfG⦵)	-1461 ± 8 kJ/mol[1]
Related compounds
Other anions	Neptunium(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Neptunium(III) fluoride can be prepared by reacting neptunium dioxide with a gas mixture of hydrogen and hydrogen fluoride at 500 °C:^[1]

${\displaystyle \mathrm {2\ NpO_{2}\ +\ H_{2}\ +\ 6\ HF\ \longrightarrow \ 2\ NpF_{3}\ +\ 4\ H_{2}O} }$

References

1. Haire, Richard G. (2006). "Neptunium". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. pp. 730–736. doi:10.1007/1-4020-3598-5_9. ISBN 1-4020-3555-1.
2. Zachariasen, W. H. (1949). "Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types". Acta Crystallographica. 2 (6): 388–390. doi:10.1107/S0365110X49001016.