Germanium tetrabromide

Germanium tetrabromide is an inorganic compound with the formula GeBr4. It can be formed by reacting solid germanium and gaseous bromine.[1][3]

Germanium tetrabromide
Names
IUPAC name
tetrabromogermane
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.270
EC Number
  • 236-612-1
  • InChI=1S/Br4Ge/c1-5(2,3)4
    Key: VJHDVMPJLLGYBL-UHFFFAOYSA-N
  • [Ge](Br)(Br)(Br)Br
Properties
Br4Ge
Molar mass 392.246 g·mol−1
Appearance Colorless liquid[1]
Melting point 21 °C[1]
Hazards
GHS labelling:
Danger
H314
P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
Structure[2]
α-Cubic (SnI4 type)
β-Monoclinic (SnBr4 type)
Thermochemistry
83.3 kcal/mol
Related compounds
Other anions
 Germanium tetrafluoride
Germanium tetrachloride
Germanium tetraiodide
Other cations
 Carbon tetrabromide
Silicon tetrabromide
Tin(IV) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

From this reaction, GeBr4 has a heat of formation of 83.3 kcal/mol.[4]

The compound is liquid at 25 °C, and forms an interlocking liquid structure.[5] From room temperature down to −60 °C the structure takes on a cubic α form, whereas at lower temperatures it takes on a monoclinic β form.

References
  1. Dennis, L. M.; Hance, F. E. (1922). "Germanium. III. Germanium Tetrabromide and Germanium Tetrachloride". Journal of the American Chemical Society. American Chemical Society (ACS). 44 (2): 299–307. doi:10.1021/ja01423a008. ISSN 0002-7863.
  2. Köhler, J.; Okudera, Η.; Simon, A. (2005). "Crystal structure of germanium tetrabromide, β-GeBr4, low temperature modification". Zeitschrift für Kristallographie - New Crystal Structures. Walter de Gruyter GmbH. 220 (1–4): 554. doi:10.1524/ncrs.2005.220.14.554. ISSN 2197-4578.
  3. Laubengayer, A. W.; Brandt, P. L. (1932). "The Preparation of Germanium Tetrabromide and Germanium Tetraiodide". Journal of the American Chemical Society. American Chemical Society (ACS). 54 (2): 621–623. doi:10.1021/ja01341a502. ISSN 0002-7863.
  4. Evans, D. F.; Richards, R. E. (1952). "233. The heats of formation of germanium tetrabromide and germanium tetraiodide". Journal of the Chemical Society (Resumed). Royal Society of Chemistry (RSC): 1292. doi:10.1039/jr9520001292. ISSN 0368-1769.
  5. Swamy, K. N.; Bhuiyan, L. B. (1980). "The Reference Interaction Site Model and the Structure of Liquid Germanium Tetrabromide". Physics and Chemistry of Liquids. Informa UK Limited. 9 (2): 169–174. doi:10.1080/00319108008084774. ISSN 0031-9104.
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