Germanium dibromide

Germanium dibromide is a bromide of germanium with the chemical formula GeBr₂.

Germanium dibromide

Identifiers
CAS Number	24415-00-7 Y
3D model (JSmol)	Interactive image
ChemSpider	4885753
ECHA InfoCard	100.155.797
EC Number	627-437-5
PubChem CID	6327224
InChI InChI=1S/Br2Ge/c1-3-2 Key: DUVPPTXIBVUIKL-UHFFFAOYSA-N
SMILES Br[Ge]Br
Properties
Chemical formula	Br2Ge
Molar mass	232.438 g·mol−1
Appearance	white to pale yellow solid[1]
Melting point	120–125 °C[2] 143–144 °C (when heating rapidly)[1]
Hazards
GHS labelling:[3]
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P321, P363, P405, P501
Related compounds
Other anions	Germanium difluoride Germanium dichloride Germanium diiodide
Other cations	Tin dibromide Lead dibromide
Related compounds	Germanium tetrabromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Germanium dibromide can be obtained by reducing germanium tetrabromide with germanium or zinc.^[4][1]

${\displaystyle {\ce {Ge + GeBr4 -> 2GeBr2}}}$

Properties

Germanium dibromide is a yellow-white solid that is soluble in ethanol and acetone. It disproportionates into germanium tetrabromide and germanium.^[1][5] It hydrolyzes to germanium dihydroxide.^[4] 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°.^[6] It can react with cyclopentadienylsodium or cyclopentadienylthallium in ether solvent to form germanocene.^[7]

References

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. 724.
2. Sigma-Aldrich Co., Germanium(II) bromide, 97%.
3. "Germanium(II) bromide". pubchem.ncbi.nlm.nih.gov.
4. Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, p. 959, ISBN 0-12-352651-5
5. L. M. Dennis (1928-08-02), "Germanium. Zusammenfassung der Untersuchungen im Department of Chemistry, Cornell University, 1921-1927", Zeitschrift fÜr anorganische und allgemeine Chemie, vol. 174, no. 1, pp. 97–141, doi:10.1002/zaac.19281740114
6. Roland C. Rouse, Donald R. Peacor, Bruce R. Maxim (1977-01-01), "The crystal structure of germanium dibromide*", Zeitschrift für Kristallographie - Crystalline Materials, vol. 145, no. 3–4, pp. 161–171, Bibcode:1977ZK....145..161R, doi:10.1524/zkri.1977.145.3-4.161, ISSN 2194-4946{{citation}}: CS1 maint: multiple names: authors list (link)
7. John V. Scibelli, M. David. Curtis (February 1973). "Bis(.pi.-cyclopentadienyl)germanium(II)". Journal of the American Chemical Society. 95 (3): 924–925. doi:10.1021/ja00784a051. ISSN 0002-7863. Retrieved 2021-06-10.