Germanium tetrafluoride

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Germanium tetrafluoride
Germanium tetrafluoride.svg
Identifiers
CAS number 7783-58-6 YesY
PubChem 82215
ChemSpider 11282354 YesY
EC number 232-011-3
Jmol-3D images Image 1
Properties[2]
Molecular formula GeF4
Molar mass 148.634 g/mol
Appearance colourless gas
Density 6.074 g/L (gas), 2.46 g/mL (liquid)[1]
Melting point −15 °C (5 °F; 258 K) at 4 bar
Boiling point −36.5 °C (−33.7 °F; 236.7 K) sublimates
Structure
Molecular shape tetrahedral
Thermochemistry
-8.008 kJ/g
Hazards
R-phrases R26 R35
S-phrases S9 S26 S28 S36 S45
Main hazards Reacts with water to form HF, corrosive
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g., phosphorus Special hazard W: Reacts with water in an unusual or dangerous manner. E.g., cesium, sodiumNFPA 704 four-colored diamond
Flash point Non-flammable
Related compounds
Other anions Germanium tetrachloride
Germanium tetrabromide
Germanium tetraiodide
Other cations Carbon tetrafluoride
Silicon tetrafluoride
Tin tetrafluoride
Lead tetrafluoride
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Germanium tetrafluoride (GeF4) is a chemical compound of germanium and fluorine. This colorless gas is formed by reacting germanium with fluorine or germanium dioxide (GeO2) with hydrofluoric acid (HF). Germanium difluoride can be synthesized by reacting germanium tetrafluoride with powdered germanium at 150–300 °C.[3]

Synthesis[edit]

Germanium tetrafluoride can be prepared by reaction of germanium with fluorine or hydrogen fluoride:

Ge + 2 F2 → GeF4

It is also formed during the thermal decomposition of a complex salt, Ba[GeF6]:[4]

Ba(GeF6) → GeF4 + BaF2

Properties[edit]

Germanium tetrafluoride is a noncombustible, strongly fuming gas with a garlic odor. It reacts with water to form hydrofluoric acid and germanium dioxide. Molecular decomposition occurs at temperatures above 1000 °C.[5]

Uses[edit]

In combination with disilane, germanium tetrafluoride is used for in the synthesis of SiGe.[1]

References[edit]

  1. ^ a b Germanium(IV) fluoride. sigmaaldrich.com
  2. ^ Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. p. 4.64. ISBN 0-8493-0486-5. 
  3. ^ Greenwood, N. N.; Earnshaw, A. (1998). Chemistry of the Elements (second edition). Butterworth Heinemann. pp. 376–377. ISBN 0-7506-3365-4. 
  4. ^ Georg Brauer: Handbuch der Präparativen Anorganischen Chemie
  5. ^ Germaniumtetrafluorid. IFA Database