Protactinium tetrafluoride is a binary inorganic compound of protactinium metal and fluorine with the chemical formula PaF4.[1]
![]() | |
Identifiers | |
---|---|
3D model (JSmol) | |
| |
| |
Properties | |
F4Pa | |
Molar mass | 307.02949 g·mol−1 |
Appearance | dark brown crystals |
Related compounds | |
Related compounds | Uranium tetrafluoride, neptunium tetrafluoride, plutonium tetrafluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Synthesis
Protactinium tetrafluoride can be obtained by fluorinating protactinium(IV) oxide with a hydrogen fluoride / hydrogen mixture at 600 °C:
- PaO2 + 4HF → PaF4 + 2H2O
The effect of hydrogen fluoride and hydrogen on protactinium(V) oxide:
- Pa2O5 + 8HF + H2 → 2PaF4 + 5H2O
Physical properties
PaF4 forms dark brown, monoclinic, needlelike crystals of UF4 structure.[2][3] The cell parameters are: a = 1.27 nm, b = 1.07 nm, c = 0.842 nm, β = 126.3°.
The compound is soluble in aqueous ammonium fluoride solutions.[4]
Chemical properties
Protactinium tetrafluoride reacts with oxygen and fluorine:[2]
- 2PaF4 + F2 → 2PaF5
- 4PaF4 + O2 → 2Pa2OF8
The compound reacts with alkalis:
- PaF4 + 4NaOH → PaO2 + 4NaF + 2H2O
The compound is displaced from the salt by barium:
- PaF4 + 2Ba → Pa + 2BaF2
References
🔥 Top keywords: Main PageSpecial:SearchPage 3Wikipedia:Featured picturesHouse of the DragonUEFA Euro 2024Bryson DeChambeauJuneteenthInside Out 2Eid al-AdhaCleopatraDeaths in 2024Merrily We Roll Along (musical)Jonathan GroffJude Bellingham.xxx77th Tony AwardsBridgertonGary PlauchéKylian MbappéDaniel RadcliffeUEFA European Championship2024 ICC Men's T20 World CupUnit 731The Boys (TV series)Rory McIlroyN'Golo KantéUEFA Euro 2020YouTubeRomelu LukakuOpinion polling for the 2024 United Kingdom general electionThe Boys season 4Romania national football teamNicola CoughlanStereophonic (play)Gene WilderErin DarkeAntoine GriezmannProject 2025