Germanium tetrafluoride

Germanium tetrafluoride

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Names
IUPAC names Germanium tetrafluoride Tetrafluorogermane Tetrafluoridogermanium
Other names Germanium(IV) fluoride Germanium fluoride
Identifiers
CAS Number	7783-58-6 Y
ChemSpider	11282354 Y
EC Number	232-011-3
Jmol 3D model	Interactive image
PubChem	82215
InChI InChI=1S/4FH.Ge/h4*1H;/q;;;;+4/p-4 Y Key: HJTZHRBGNWZTKK-UHFFFAOYSA-J Y
SMILES [Ge+4].[F-].[F-].[F-].[F-]
Properties
Chemical formula	GeF4
Molar mass	148.634 g/mol
Appearance	colourless gas
Density	6.074 g/L (gas), 2.46 g/mL (liquid)
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
Std enthalpy of formation (ΔfHo298)	-8.008 kJ/g
Vapor pressure	{{{value}}}
Related compounds
Other anions	Germanium tetrachloride Germanium tetrabromide Germanium tetraiodide
Other cations	Carbon tetrafluoride Silicon tetrafluoride Tin tetrafluoride Lead tetrafluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.

Synthesis

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]:

Ba(GeF₆) → GeF₄ + BaF₂

Properties

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.

Uses

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