Chemistry:Protactinium(V) fluoride
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Identifiers | |
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3D model (JSmol)
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PubChem CID
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Properties | |
F5Pa | |
Molar mass | 326.02790 g·mol−1 |
Appearance | white solid[1] |
Soluble in water and hydrofluoric acid[1] | |
Related compounds | |
Other anions
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protactinium(V) chloride protactinium(V) bromide protactinium(V) iodide |
Other cations
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uranium(V) fluoride |
Related compounds
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protactinium(IV) fluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Infobox references | |
Protactinium(V) fluoride is a fluoride of protactinium with the chemical formula PaF5.
Preparation
Protactinium(V) fluoride can be obtained by reacting protactinium(V) oxide with bromine trifluoride or bromine pentafluoride at 600 °C:[1]
- [math]\ce{ 3 Pa2O5 + 10 BrF3 (6 BrF5) -> 6 PaF5 + 5 Br2 (3 Br2 ) + 7.5 O2 }[/math]
It can also be obtained by reacting protactinium(V) chloride or protactinium(IV) fluoride with fluorine gas at 700 °C:[1]
- [math]\ce{ 2 PaF4 + F2 -> 2 PaF5 }[/math]
The hydrate form of protactinium(V) fluoride can be formed by the reaction of protactinium(V) oxide and hydrofluoric acid in an aqueous solution:[1]
- [math]\ce{ Pa2 O5 + 10 HF -> 2 PaF5 . 2 H2O + 6 H2O }[/math]
It can also be decomposed from fluorine-containing protactinium complexes.[2]
Properties
Protactinium(V) fluoride is a white, volatile, extremely hygroscopic solid that is partially soluble in water and soluble in hydrofluoric acid. It has a tetragonal crystal structure of the β-uranium pentafluoride type with the space group I42d (space group no. 122) with the lattice parameters a = 1153 pm, c = 510 pm. Quartz and Pyrex are attacked by the compound at higher temperatures. As a dihydrate, it is a colourless, hygroscopic, crystalline solid that is waxy in nature. It is soluble in water and hydrofluoric acid.[1] It reacts with phosphorus trifluoride to form protactinium(IV) fluoride.[3] The dihydrate cannot be converted into the anhydrous form in air, hydrogen fluoride or fluorine at low temperatures. Instead, diprotactinium(V) oxide octafluoride (Pa2OF8) is formed. At higher temperatures around 325 °C, a mixture of the diprotactinium(V) oxide octafluoride and protactinium(V) fluoride is formed.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Handbuch der Präparativen Anorganischen Chemie.. p. 1170. ISBN 3432023286.
- ↑ 2.0 2.1 G. Meyer; Lester R. Morss (1991) (in de). Synthesis of Lanthanide and Actinide Compounds. Springer. p. 77. ISBN 9780792310181. https://books.google.com/books?id=bnS5elHL2w8C&pg=PA77.
- ↑ Lester R. Morss, ed (2010) (in de). The Chemistry of the Actinide and Transactinide Elements. 1. Springer. p. 198. ISBN 978-94-0070211-0.
![]() | Original source: https://en.wikipedia.org/wiki/Protactinium(V) fluoride.
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