Protactinium(V) fluoride

Identifiers

CAS Number

* 15192-29-7 Y

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[1]

Solubility in water

| Soluble in water and hydrofluoric acid[1]
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]

[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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Handbuch der Präparativen Anorganischen Chemie.. p. 1170. ISBN 3432023286.
2. ↑ 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.
3. ↑ Lester R. Morss, ed (2010) (in de). The Chemistry of the Actinide and Transactinide Elements. 1. Springer. p. 198. ISBN 978-94-0070211-0.

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Salts and covalent derivatives of the fluoride ion

HF |  |  |  | He

|
|
|
|

LiF | BeF2 | BF
BF3
B2F4 | CF4
other compounds | NF3
FN3
N2F2
N2F4
NF5§  | F2O
F2O2
other compounds | F2 | Ne
NaF | MgF2 | AlF
AlF3 | SiF4 | P2F4
PF3
PF5 | S2F2
SF2
SF4
SF6 | ClF
ClF3
ClF5 | Ar
KF | CaF
CaF2 | ScF3 | TiF2
TiF3
TiF4 | VF2
VF3
VF4
VF5 | CrF2
CrF3
CrF4
CrF5
CrF6§  | MnF2 | FeF2
FeF3 | CoF2
CoF3 | NiF2 | CuF
CuF2 | ZnF2 | GaF2
GaF3 | GeF2
GeF4 | AsF3
AsF5 | Se2F2
SeF4
SeF6 | BrF
BrF3
BrF5 | KrF2
RbF | SrF
SrF2 | YF3 | ZrF3
ZrF4 | NbF4
NbF5 | MoF2
MoF3
MoF4
MoF5
MoF6 | TcF4
TcF6 | RuF3
RuF5
RuF6 | RhF3
RhF5
RhF6 | PdF2 | AgF | CdF2 | InF
InF2
InF3 | SnF2
SnF4 | SbF3
SbF5 | Te3F2
TeF4
TeF6 | IF
IF3</br>IF5</br>IF7 | XeF2
XeF4
XeF6
CsF | BaF2 |  | HfF4 | TaF5 | WF2
WF3
WF4
WF5
WF6 | Re3F9
ReF4
ReF5
ReF6
ReF7 | OsF4
OsF5
OsF6 | IrF2
IrF3
IrF4
IrF5
IrF6 | PtF2
PtF4
PtF5
PtF6 | AuF
AuF3
Au2F10
AuF5•F2 | Hg2F2
HgF2
HgF4 | TlF | PbF2
PbF4 | BiF3
BiF5 | PoF2
PoF4
PoF6 | AtF  | RnF2
FrF | RaF2 |  | Rf  | Db  | Sg  | Bh  | Hs  | Mt  | Ds  | Rg  | Cn  | Nh  | Fl  | Mc  | Lv  | Ts  | Og
| ↓  |  |
LaF3 | CeF3
CeF4 | PrF3 | NdF2,
NdF3 | PmF3 | SmF2,
SmF3 | EuF2,
EuF3 | GdF3 | TbF3 | DyF2,
DyF3 | HoF3 | ErF3 | TmF2
TmF3 | YbF2
YbF3 | LuF3
AcF3 | ThF4 | PaF5 | UF3
UF4
UF5
UF6 | NpF4
NpF6 | PuF3
PuF6 | AmF2
AmF3 | CmF3 | BkF3 | CfF3 | EsF3 | Fm  | Md  | No  | LrF3

§ means the substance has not been made.

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Protactinium compounds

Pa(IV)|

* PaO2
* Pa(C8H8)2

Pa(V)|

* Pa2O5
* PaCl5

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