Samarium(II) fluoride

Samarium(II) fluoride
Identifiers
CAS Number	15192-17-3 ;
3D model (JSmol)	Interactive image;
ChemSpider	4416535;
PubChem CID	101282799;
CompTox Dashboard (EPA)	DTXSID501313378 ;
	InChI InChI=1S/2FH.Sm/h2*1H;/p-2 Key: PBDMHCPVUGOGTK-UHFFFAOYSA-L;
	SMILES [F-].[F-].[Sm];
Properties
Chemical formula	SmF2
Structure
Crystal structure	Fluorite structure
Space group	Fm3m (No. 225)
Lattice constant	a = 587.10 pm
Formula units (Z)	4
Related compounds
Other anions	Samarium(II) chloride ; Samarium(II) bromide ; Samarium(II) iodide
Other cations	Europium(II) fluoride ; Thulium(II) fluoride ; Ytterbium(II) fluoride
Related compounds	Samarium(III) fluoride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Samarium(II) fluoride is one of fluorides of samarium with a chemical formula SmF₂. The compound crystalizes in the fluorite structure, and is significantly nonstoichiometric. Along with europium(II) fluoride and ytterbium(II) fluoride, it is one of three known rare earth difluorides, the rest are unstable.^[1]

Preparation

Samarium(II) fluoride can be prepared by using samarium or hydrogen gas to reduce samarium(III) fluoride:^[2]

\mathrm {2\ SmF_{3}+Sm\longrightarrow 3\ SmF_{2}}

\mathrm {2\ SmF_{3}+H_{2}\longrightarrow 2\ SmF_{2}+2\ HF}

Properties

Samarium(II) fluoride is a purple to black solid. This is present in the crystal structure of the cubic calcium fluoride type (space group Fm3m; No. 225 with a = 587.7 pm).^[3]^[2]^[4]

References

^ ^a ^b Greis, Ortwin; Haschke, John M. (1982). "Chapter 45 Rare earth fluorides". Handbook on the Physics and Chemistry of Rare Earths Volume 5. Vol. 5. Elsevier. pp. 387–460. doi:10.1016/s0168-1273(82)05008-9. ISBN 9780444863751. ISSN 0168-1273.
^ ^a ^b Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 255.
^ Ans, Jean d'; Lax, Ellen (1998). Taschenbuch für Chemiker und Physiker (in German). Springer. ISBN 978-3-540-60035-0.
^ "mp-1206711: SmF2 (Cubic, Fm-3m, 225)". Materials Project. Retrieved 2023-12-22.

[Greis1982-1] Greis, Ortwin; Haschke, John M. (1982). "Chapter 45 Rare earth fluorides". Handbook on the Physics and Chemistry of Rare Earths Volume 5. Vol. 5. Elsevier. pp. 387–460. doi:10.1016/s0168-1273(82)05008-9. ISBN 9780444863751. ISSN 0168-1273.

[Georg-2] Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 255.

[3] Ans, Jean d'; Lax, Ellen (1998). Taschenbuch für Chemiker und Physiker (in German). Springer. ISBN 978-3-540-60035-0.

[4] "mp-1206711: SmF2 (Cubic, Fm-3m, 225)". Materials Project. Retrieved 2023-12-22.

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