Praseodymium(IV) fluoride

Praseodymium(IV) fluoride

Names
Other names tetrafluoropraseodymium, praseodymium tetrafluoride
Identifiers
CAS Number	15192-24-2 Y
3D model (JSmol)	Interactive image
ChemSpider	9588184
PubChem CID	11413297
CompTox Dashboard (EPA)	DTXSID201336913
InChI InChI=1S/4FH.Pr/h4*1H;/q;;;;+4/p-4 Key: AQHKOMUMLGCMJB-UHFFFAOYSA-J
SMILES F[Pr](F)(F)F
Properties
Chemical formula	F4Pr
Molar mass	216.90127 g·mol−1
Appearance	light-yellow crystals
Density	g/cm3
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 [77 °F], 100 kPa). Infobox references

Praseodymium(IV) fluoride (also praseodymium tetrafluoride) is a binary inorganic compound, a highly oxidised metal salt of praseodymium and fluoride^[1] with the chemical formula PrF₄.

Praseodymium(IV) fluoride can be prepared by the effect of krypton difluoride on praseodymium(IV) oxide:^[2]

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

Praseodymium(IV) fluoride can also be made by the dissolution of sodium hexafluoropraseodymate(IV) in liquid hydrogen fluoride:^[3]

${\displaystyle {\mathsf {Na_{2}[PrF_{6}]+2HF\ {\xrightarrow {}}\ PrF_{4}\downarrow +2NaHF_{2}}}}$

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.

• Praseodymium(III) fluoride
• Uranium tetrafluoride