Chemistry:Protactinium tetrafluoride
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| Identifiers | |
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3D model (JSmol)
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| Properties | |
| F4Pa | |
| Molar mass | 307.02949 g·mol−1 |
| Appearance | dark brown crystals |
| Related compounds | |
Related compounds
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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). | |
| Infobox references | |
Tracking categories (test):
Protactinium tetrafluoride is a binary inorganic compound of protactinium metal and fluorine with the chemical formula PaF
4.[1]
Synthesis
Protactinium tetrafluoride can be obtained by fluorinating protactinium(IV) oxide with a hydrogen fluoride / hydrogen mixture at 600 °C:
- PaO
2 + 4HF → PaF
4 + 2H
2O
The effect of hydrogen fluoride and hydrogen on protactinium(V) oxide:
- Pa
2O
5 + 8HF + H
2 → 2PaF
4 + 5H
2O
Physical properties
PaF
4 forms dark brown, monoclinic, needlelike crystals of UF
4 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]
- 2PaF
4 + F
2 → 2PaF
5
- 4PaF
4 + O
2 → 2Pa
2OF
8
The compound reacts with alkalis:
- PaF
4 + 4NaOH → PaO
2 + 4NaF + 2H
2O
The metal is displaced from the salt by barium:
- PaF
4 + 2Ba → Pa + 2BaF
2
References
- ↑ Hawkins, Donald T. (6 December 2012) (in en). Binary Fluorides: Free Molecular Structures and Force Fields A Bibliography (1957–1975). Springer Science & Business Media. p. 50. ISBN 978-1-4684-6147-3. https://books.google.com/books?id=kOHgBwAAQBAJ&dq=Protactinium+tetrafluoride&pg=PA50. Retrieved 2 April 2024.
- ↑ 2.0 2.1 (in en) Proceedings of the Protactinium Chemistry Symposium: Gatlinburg, Tennessee, April 25-26, 1963 : Sessions 1-111. United States Atomic Energy Commission, Technical Information Service Extension. 1964. p. 57. https://books.google.com/books?id=zmdpXPimiOIC&dq=Protactinium+tetrafluoride&pg=PA57. Retrieved 2 April 2024.
- ↑ (in en) Advances in Inorganic Chemistry and Radiochemistry. Academic Press. 28 February 1970. p. 7. ISBN 978-0-08-057861-3. https://books.google.com/books?id=C7aXnkiqTUcC&dq=Protactinium+tetrafluoride&pg=PA9. Retrieved 2 April 2024.
- ↑ (in en) Advances in Inorganic Chemistry and Radiochemistry. Academic Press. 28 February 1970. p. 9. ISBN 978-0-08-057861-3. https://books.google.com/books?id=C7aXnkiqTUcC&dq=Protactinium+tetrafluoride&pg=PA9. Retrieved 2 April 2024.
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