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Berkelium tetrafluoride
Names
	Other names berkelium(IV) fluoride
Identifiers
CAS Number	22422-27-1;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/Bk.4FH/h;4*1H/q+4;;;;/p-4 Key: RCTCKHUWZHELJP-UHFFFAOYSA-J;
	SMILES [Bk+4].[F-].[F-].[F-].[F-];
Properties
Chemical formula	BkF4
Molar mass	323 g·mol−1
Appearance	yellow-green solid
Solubility in water	practically insoluble
Structure
Crystal structure	monoclinic
Related compounds
Related compounds	Curium(III) fluoride, berkelium trifluoride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Berkelium tetrafluoride is a binary inorganic compound of berkelium and fluorine with the chemical formula BkF₄.^[1]

Synthesis

Berkelium tetrafluoride may be formed by the fluorination of berkelium trioxide, dioxide, or trifluoride with elemental fluorine at elevated temperatures:

2Bk₂O₃ + 8F₂ → 4BkF₄ + 3O₂

2BkF₃ + F₂ → 2BkF₄

Physical properties

Berkelium(IV) fluoride forms light brown crystals of monoclinic crystal structure of uranium tetrafluoride type. Cell parameters: a = 1.2396 nm, b = 1.0466 nm, c = 0.8118 nm, angle β = 126.33°.^[2]^[3]

Chemical properties

Berkelium tetrafluoride is reduced by lithium at elevated temperatures to metallic berkelium:^[4]

BkF₄ + 4Li → Bk + 4LiF

References

^ Cunningham, B. B. (January 1959). "Berkelium and californium". Journal of Chemical Education. 36 (1): 32. doi:10.1021/ed036p32. ISSN 0021-9584. Retrieved 5 April 2023.
^ Keenan, Thomas K.; Asprey, Larned B. (February 1969). "Lattice constants of actinide tetrafluorides including berkelium". Inorganic Chemistry. 8 (2): 235–238. doi:10.1021/ic50072a011. ISSN 0020-1669. Retrieved 5 April 2023.
^ Asprey, L. B.; Keenan, T. K. (1 September 1968). "The preparation of berkelium tetrafluoride and its lattice parameters (1)". Inorganic and Nuclear Chemistry Letters. 4 (9): 537–541. doi:10.1016/0020-1650(68)80028-5. ISSN 0020-1650. Retrieved 5 April 2023.
^ Edelstein, Norman M. (11 September 2013). Actinides in Perspective: Proceedings of the Actinides—1981 Conference, Pacific Grove, California, USA, 10-15 September 1981. Elsevier. p. 334. ISBN 978-1-4831-9051-8. Retrieved 5 April 2023.

[1] Cunningham, B. B. (January 1959). "Berkelium and californium". Journal of Chemical Education. 36 (1): 32. doi:10.1021/ed036p32. ISSN 0021-9584. Retrieved 5 April 2023.

[2] Keenan, Thomas K.; Asprey, Larned B. (February 1969). "Lattice constants of actinide tetrafluorides including berkelium". Inorganic Chemistry. 8 (2): 235–238. doi:10.1021/ic50072a011. ISSN 0020-1669. Retrieved 5 April 2023.

[3] Asprey, L. B.; Keenan, T. K. (1 September 1968). "The preparation of berkelium tetrafluoride and its lattice parameters (1)". Inorganic and Nuclear Chemistry Letters. 4 (9): 537–541. doi:10.1016/0020-1650(68)80028-5. ISSN 0020-1650. Retrieved 5 April 2023.

[4] Edelstein, Norman M. (11 September 2013). Actinides in Perspective: Proceedings of the Actinides—1981 Conference, Pacific Grove, California, USA, 10-15 September 1981. Elsevier. p. 334. ISBN 978-1-4831-9051-8. Retrieved 5 April 2023.

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