Chemistry:Samarium(II) fluoride
From HandWiki
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3D model (JSmol)
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| ChemSpider | |
PubChem CID
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| Properties | |
| SmF2 | |
| Structure[1] | |
| Fluorite structure | |
| Fm3m (No. 225) | |
a = 587.10 pm
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Formula units (Z)
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4 |
| Related compounds | |
Other anions
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Samarium(II) chloride Samarium(II) bromide Samarium(II) iodide |
Other cations
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Europium(II) fluoride Thulium(II) fluoride Ytterbium(II) fluoride |
Related compounds
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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]
- [math]\displaystyle{ \mathrm{2 \ SmF_3 + Sm \longrightarrow 3 \ SmF_2} }[/math]
- [math]\displaystyle{ \mathrm{2 \ SmF_3 + H_2 \longrightarrow 2 \ SmF_2 + 2 \ HF} }[/math]
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
- ↑ 1.0 1.1 Greis, Ortwin; Haschke, John M. (1982). "Chapter 45 Rare earth fluorides". Handbook on the Physics and Chemistry of Rare Earths Volume 5. 5. Elsevier. pp. 387–460. doi:10.1016/s0168-1273(82)05008-9. ISBN 9780444863751.
- ↑ 2.0 2.1 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) (in de). Taschenbuch für Chemiker und Physiker. Springer. ISBN 978-3-540-60035-0. https://books.google.com/books?id=ssy59etLaksC&pg=PA734.
- ↑ "mp-1206711: SmF2 (Cubic, Fm-3m, 225)". https://next-gen.materialsproject.org/materials/mp-1206711/.
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