Protactinium tetrafluoride

Protactinium tetrafluoride
Identifiers
3D model (JSmol)
  • InChI=1S/4FH.Pa/h4*1H;/q;;;;+4/p-4
    Key: CRDGDRUMLTUCQA-UHFFFAOYSA-J
  • [Pa+4].[F-].[F-].[F-].[F-]
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).

Protactinium tetrafluoride is a binary inorganic compound of protactinium metal and fluorine with the chemical formula PaF4.[1]

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 metal is displaced from the salt by barium:

PaF4 + 2Ba → Pa + 2BaF2

References

  1. ^ Hawkins, Donald T. (6 December 2012). Binary Fluorides: Free Molecular Structures and Force Fields A Bibliography (1957–1975). Springer Science & Business Media. p. 50. ISBN 978-1-4684-6147-3. Retrieved 2 April 2024.
  2. ^ a b 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. Retrieved 2 April 2024.
  3. ^ Advances in Inorganic Chemistry and Radiochemistry. Academic Press. 28 February 1970. p. 7. ISBN 978-0-08-057861-3. Retrieved 2 April 2024.
  4. ^ Advances in Inorganic Chemistry and Radiochemistry. Academic Press. 28 February 1970. p. 9. ISBN 978-0-08-057861-3. Retrieved 2 April 2024.

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