Ytterbium(II) bromide
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| Other names
Ytterbium dibromide
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3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| YbBr2 | |
| Molar mass | 332.84 |
| Appearance | pale yellow solid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ytterbium(II) bromide is an inorganic compound with the chemical formula YbBr2.
Preparation
[edit]Ytterbium(II) bromide can be produced by the reduction reaction of ytterbium(III) bromide and hydrogen at 500~600 °C:[1]
- 2 YbBr3 + H2 → 2 YbBr2 + 2 HBr
The ammonia compound can be obtained by reacting metallic ytterbium and ammonium bromide in liquid ammonia at −78 °C. The ammonia compound can be decomposed in high vacuum at 200 °C to obtain ytterbium(II) bromide:[1]
- Yb + 2 NH4Br → YbBr_2 + 2 NH3 + H2
Ytterbium(II) bromide can also be prepared by vacuum reduction of metallic ytterbium at 960 °C:[2]
- Yb + 2 YbBr3 → 3 YbBr2
Properties
[edit]Ytterbium(II) bromide is a light yellow solid and is highly hygroscopic. It can only be stored in an inert atmosphere or high vacuum. It is unstable in air or moisture and rapidly converts to the oxybromide and releases hydrogen gas. Ytterbium(II) bromide belongs to the orthorhombic crystal system, with SrI2 structure and space group Pbca,[3] or CaCl2 structure and space group Pnnm. Its unit cell parameters are a=6.63 Å, b=6.93 Å, c=4.47Å.[1][3]
References
[edit]- ^ a b c Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. p. 1081. ISBN 978-3-432-02328-1.
- ^ Voos-Esquivel, Christine A.; Eick, Harry A. (Apr 1987). "Synthesis of YbBr2 and YbCl2 and an x-ray diffraction study of the system YbBr2YbCl2". Journal of Solid State Chemistry. 67 (2): 291–296. doi:10.1016/0022-4596(87)90366-5.
- ^ a b Beck, Horst. P.; Bärnighausen, H. (Dec 1971). "Zur Kristallchemie der Ytterbium(II)-Halogenide YbCl 2 und YbBr 2". Zeitschrift für anorganische und allgemeine Chemie. 386 (2): 221–228. doi:10.1002/zaac.19713860214. ISSN 0044-2313.