Germanium dibromide
{{Chembox
| ImageFile=GeBr2.png
|Section1={{Chembox Identifiers
| CASNo=24415-00-7
| CASNo_Ref = {{cascite|correct|CAS}}
| ChemSpiderID = 4885753
| EC_number= 627-437-5
| PubChem = 6327224
| StdInChI=1S/Br2Ge/c1-3-2
| StdInChIKey = DUVPPTXIBVUIKL-UHFFFAOYSA-N
| SMILES=Br[Ge]Br
}}
|Section2={{Chembox Properties
| Appearance= white to pale yellow solid
|Ge=1|Br=2
| Density=
| MeltingPt= 120–125 °C{{Sigma-Aldrich|Aldrich|572659|name=Germanium(II) bromide, 97%|date=2017-05-09}}
143–144 °C (when heating rapidly)
|BoilingPt=
| Solubility=
}}
| Section7={{Chembox Hazards
| GHSPictograms = {{GHS05}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|314}}
| PPhrases = {{P-phrases|260|264|280|301+330+331|302+361+354|304+340|305+354+338|316|321|363|405|501}}
}}
| Section8={{Chembox Related
| OtherAnions=Germanium difluoride
Germanium dichloride
Germanium diiodide
| OtherCations=Tin dibromide
Lead dibromide
| OtherCompounds=Germanium tetrabromide
}}
}}
Germanium dibromide is a bromide of germanium with the chemical formula GeBr2.
Preparation
Germanium dibromide can be obtained by reducing germanium tetrabromide with germanium or zinc.{{Holleman&Wiberg|edition=101.|page=959}}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. 724.
:{{chem2 | Ge + GeBr4 -> 2 GeBr2 }}
Properties
Germanium dibromide is a yellow-white solid that is soluble in ethanol and acetone. It disproportionates into germanium tetrabromide and germanium.{{citation|author=L. M. Dennis|date=1928-08-02|doi=10.1002/zaac.19281740114|issue=1|pages=97–141|periodical=Zeitschrift fÜr anorganische und allgemeine Chemie|title=Germanium. Zusammenfassung der Untersuchungen im Department of Chemistry, Cornell University, 1921-1927|volume=174}} It hydrolyzes to germanium dihydroxide. Germanium dibromide is monoclinic, space group P21/c (No. 14), lattice parameters a = 11.68 Å, b = 9.12 Å, c = 7.02 Å, and β = 101.9°.{{citation|author=Roland C. Rouse, Donald R. Peacor, Bruce R. Maxim|date=1977-01-01|doi=10.1524/zkri.1977.145.3-4.161|issn=2194-4946|issue=3–4|periodical=Zeitschrift für Kristallographie - Crystalline Materials|title=The crystal structure of germanium dibromide*|volume=145|pages=161–171 |bibcode=1977ZK....145..161R }} It can react with cyclopentadienylsodium or cyclopentadienylthallium in ether solvent to form germanocene.{{cite journal|journal=Journal of the American Chemical Society|volume=95|issue=3|language=en|issn=0002-7863|date=February 1973|pages=924–925|doi=10.1021/ja00784a051|url=https://pubs.acs.org/doi/abs/10.1021/ja00784a051|title=Bis(.pi.-cyclopentadienyl)germanium(II)|accessdate=2021-06-10|author=John V. Scibelli, M. David. Curtis|url-access=subscription}}