Misplaced Pages

Praseodymium(IV) fluoride

Names
Other names tetrafluoropraseodymium, praseodymium tetrafluoride
Identifiers
CAS Number	15192-24-2
3D model (JSmol)	Interactive image
ChemSpider	9588184
PubChem CID	11413297
CompTox Dashboard (EPA)	DTXSID201336913
InChI InChI=1S/4FH.Pr/h4*1H;/q;;;;+4/p-4Key: AQHKOMUMLGCMJB-UHFFFAOYSA-J
SMILES F(F)(F)F
Properties
Chemical formula	F4Pr
Molar mass	216.90127 g·mol
Appearance	light-yellow crystals
Density	g/cm
Solubility in water	reacts with water
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Related compounds
Other cations	CeF4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Praseodymium(IV) fluoride (also praseodymium tetrafluoride) is a binary inorganic compound, a highly oxidised metal salt of praseodymium and fluoride with the chemical formula PrF₄.

Synthesis

Praseodymium(IV) fluoride can be prepared by the effect of krypton difluoride on praseodymium(IV) oxide:

${\displaystyle {\mathsf {PrO_{2}+2KrF_{2}\ {\xrightarrow {}}\ PrF_{4}+O_{2}+2Kr}}}$

Praseodymium(IV) fluoride can also be made by the dissolution of sodium hexafluoropraseodymate(IV) in liquid hydrogen fluoride:

${\displaystyle {\mathsf {Na_{2}+2HF\ {\xrightarrow {}}\ PrF_{4}\downarrow +2NaHF_{2}}}}$

Properties

Praseodymium(IV) fluoride forms light yellow crystals. The crystal structure is anticubic and isomorphic to that of uranium tetrafluoride UF₄. It decomposes when heated:

${\displaystyle {\mathsf {2PrF_{4}\ {\xrightarrow {90^{o}C}}\ 2PrF_{3}+F_{2}}}}$

Due to the high normal potential of the tetravalent praseodymium cations (Pr3+ / Pr4+: +3.2 V), praseodymium(IV) fluoride decomposes in water, releasing oxygen, O₂.

See also

• Praseodymium(III) fluoride
• Uranium tetrafluoride

References

1. Vent-Schmidt, Thomas; Riedel, Sebastian (November 6, 2015). "Investigation of Praseodymium Fluorides: A Combined Matrix-Isolation and Quantum-Chemical Study". Inorganic Chemistry. 54 (23): 11114–11120. doi:10.1021/acs.inorgchem.5b01175. PMID 26544761. Retrieved 18 June 2021.
2. Meyer, G.; Morss, Lester R. (1990-12-31). Synthesis of Lanthanide and Actinide Compounds. Springer Science & Business Media. p. 367. ISBN 978-0-7923-1018-1. Retrieved 18 June 2021.
3. Emeléus, H. J.; Sharpe, A. G. (1977-09-01). Advances in Inorganic Chemistry and Radiochemistry. Academic Press. p. 368. ISBN 978-0-08-057869-9. Retrieved 18 June 2021.

• Fluorides
• Praseodymium compounds
• Inorganic compounds
• Lanthanide halides