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Protactinium(V) fluoride
Identifiers
CAS Number	15192-29-7 ;
3D model (JSmol)	Interactive image;
PubChem CID	101946429 (charge error);
	InChI InChI=1S/5FH.Pa/h5*1H;/q;;;;;+5/p-5 Key: LULSFBDYSXVRIJ-UHFFFAOYSA-I;
	SMILES F[Pa](F)(F)(F)F;
Properties
Chemical formula	F5Pa
Molar mass	326.02790 g·mol−1
Appearance	white solid
Solubility in water	Soluble in water and hydrofluoric acid
Related compounds
Other anions	protactinium(V) chloride; protactinium(V) bromide; protactinium(V) iodide
Other cations	uranium(V) fluoride
Related compounds	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]

{\ce {3 Pa2O5 + 10 BrF3 (6 BrF5) -> 6 PaF5 + 5 Br2 (3 Br2 ) + 7.5 O2}}

It can also be obtained by reacting protactinium(V) chloride or protactinium(IV) fluoride with fluorine gas at 700 °C:^[1]

{\ce {2 PaF4 + F2 -> 2 PaF5}}

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]

{\ce {Pa2 O5 + 10 HF -> 2 PaF5 . 2 H2O + 6 H2O}}

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

^ ^a ^b ^c ^d ^e ^f Brauer, Georg (1975). Handbuch der Präparativen Anorganischen Chemie. F. Enke. p. 1170. ISBN 3432023286.
^ ^a ^b G. Meyer; Lester R. Morss (1991). Synthesis of Lanthanide and Actinide Compounds (in German). Springer. p. 77. ISBN 9780792310181.
^ Lester R. Morss; Norman M. Edelstein; J. Fuger, eds. (2010). The Chemistry of the Actinide and Transactinide Elements (in German). Vol. 1. Springer. p. 198. ISBN 978-94-0070211-0.

[brauer-1] ^ ^a ^b ^c ^d ^e ^f Brauer, Georg (1975). Handbuch der Präparativen Anorganischen Chemie. F. Enke. p. 1170. ISBN 3432023286.

[G._Meyer,_Lester_R._Morss-2] G. Meyer; Lester R. Morss (1991). Synthesis of Lanthanide and Actinide Compounds (in German). Springer. p. 77. ISBN 9780792310181.

[Lester_R._Morss,_Norman_M._Edelstein,_J._Fuger-3] Lester R. Morss; Norman M. Edelstein; J. Fuger, eds. (2010). The Chemistry of the Actinide and Transactinide Elements (in German). Vol. 1. Springer. p. 198. ISBN 978-94-0070211-0.

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