Ytterbium(II) bromide

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Ytterbium(II) bromide
SrI2.png
Names
Other names
Ytterbium dibromide
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/2BrH.Yb/h2*1H;/q;;+2/p-2
    Key: JLLHSFOQJNVQCV-UHFFFAOYSA-L
  • [Yb+2].[Br-].[Br-]
Properties
Br2Yb
Molar mass 332.853 g·mol−1
Appearancepale yellow solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Ytterbium(II) bromide is an inorganic compound with the chemical formula YbBr2.

Contents

Preparation

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 → YbBr2 + 2 NH3 + H2

Ytterbium(II) bromide can also be prepared by comproportionation of metallic ytterbium and ytterbium(III) bromide in a vacuum at 960 °C: [2]

Yb + 2 YbBr3 → 3 YbBr2

Properties

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

  1. 1 2 3 Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. p. 1081. ISBN   978-3-432-02328-1.
  2. Voos-Esquivel, Christine A.; Eick, Harry A. (Apr 1987). "Synthesis of YbBr2 and YbCl2 and an x-ray diffraction study of the system YbBr2–YbCl2" . Journal of Solid State Chemistry. 67 (2): 291–296. Bibcode:1987JSSCh..67..291V. doi:10.1016/0022-4596(87)90366-5.
  3. 1 2 Beck, Horst. P.; Bärnighausen, H. (Dec 1971). "Zur Kristallchemie der Ytterbium(II)-Halogenide YbCl2 und YbBr2" . Zeitschrift für anorganische und allgemeine Chemie. 386 (2): 221–228. Bibcode:1971ZAACh.386..221B. doi:10.1002/zaac.19713860214. ISSN   0044-2313.