Germanium (IV) fluoride

Structural formula
General
Surname	Germanium (IV) fluoride
other names	Germanium tetrafluoride; Tetrafluorogerman;
Molecular formula	GeF 4
Brief description	colorless gas with a garlic-like odor
External identifiers / databases
EC number	232-011-3
ECHA InfoCard	100.029.101
PubChem	82215
ChemSpider	74195
Wikidata	Q424958
properties
Molar mass	148.58 g mol −1
Physical state	gaseous
density	2.16 g cm −3 (at 0 ° C)
Sublimation point	−36.5 ° C
Vapor pressure	404 k Pa (−16 ° C)
solubility	Decomposes in water
safety instructions
H and P phrases	H: 280-330-314-372
	P: 280-305 + 351 + 338-310
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Germanium (IV) fluoride is a chemical compound from the group of germanium compounds and fluorides .

Extraction and presentation

Germanium (IV) fluoride can be produced by reacting germanium with fluorine or hydrogen fluoride .

{\ displaystyle \ mathrm {Ge + 2 \ F_ {2} \ longrightarrow GeF_ {4}}}

It is also formed during thermal decomposition (700 ° C) of the complex salt Ba [GeF6], which can be obtained by precipitating a solution of germanium dioxide in hydrofluoric acid with barium chloride .

{\ displaystyle {\ ce {GeO2 + 6 HF -> H2GeF6 + 2 H2O}}}

{\ displaystyle {\ ce {H2GeF6 + BaCl2 -> BaGeF6 + 2 HCl}}}

{\ displaystyle {\ ce {BaGeF6 -> GeF4 + BaF2}}}

properties

Germanium (IV) fluoride is a non-flammable gas that smokes heavily in air and has a garlic-like odor. It forms corrosive acids with water (hydrolysis to GeO ₂ and H ₂ GeF ₆ ) and can react violently with these. Above 1000 ° C, it decomposes in moist air, producing hydrogen fluoride, fluorine and germanium dioxide . It crystallizes out as a trihydrate from aqueous solutions.

use

Germanium (IV) fluoride is used in combination with disilane to produce SiGe crystals.

Web links

RL Benoit, J. Place: Fluoride complexes of germanium (IV) in aqueous solution . In: Canadian Journal of Chemistry . 41 (5), 1963, pp. 1170-1180, doi : 10.1139 / v63-165 .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Entry on germanium tetrafluoride in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
↑ ^a ^b Germanium (IV) fluoride data sheet from Sigma-Aldrich , accessed on April 3, 2011 ( PDF ).

↑ ^a ^b ^c Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 230.

↑ Wolfgang Legrum: Fragrances, between stink and fragrance , Vieweg + Teubner Verlag (2011) pp. 68–69, ISBN 978-3-8348-1245-2 .

^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 91st – 100th, improved and greatly expanded edition. Walter de Gruyter, Berlin 1985, ISBN 3-11-007511-3 , p. 791.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g Entry on germanium tetrafluoride in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .

[Sigma-2] Germanium (IV) fluoride data sheet from Sigma-Aldrich , accessed on April 3, 2011 ( PDF ).

[Brauer-3] Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 230.

[Legrum-4] Wolfgang Legrum: Fragrances, between stink and fragrance , Vieweg + Teubner Verlag (2011) pp. 68–69, ISBN 978-3-8348-1245-2 .

[5] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 91st – 100th, improved and greatly expanded edition. Walter de Gruyter, Berlin 1985, ISBN 3-11-007511-3 , p. 791.