Disilane

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Structural formula
Structural formula of the disilane
General
Surname Disilane
other names

Disilicoethane

Molecular formula Si 2 H 6
Brief description

colorless gas with an unpleasant odor

External identifiers / databases
CAS number 1590-87-0
EC number 216-466-5
ECHA InfoCard 100.014.970
PubChem 74123
ChemSpider 66736
Wikidata Q116073
properties
Molar mass 62.22 g mol −1
Physical state

gaseous

density
  • 2.66 g l −1 (at 15 ° C)
  • 0.69 g cm −3 (at −25 ° C)
Melting point

−132.5 ° C

boiling point

−14.5 ° C

Vapor pressure

0.33 M Pa (21 ° C)

solubility

Decomposes with water

safety instructions
GHS labeling of hazardous substances
02 - Highly / extremely flammable 04 - gas bottle

danger

H and P phrases H: 220-280
P: 210-377-381-403
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Disilane ( n -Si 2 H 6 ) is a chemical compound that belongs to the group of silicon hydrides ( silanes ), where it forms the analogue of the hydrocarbon ethane .

Extraction and presentation

Disilane can be obtained by acid decomposition of magnesium silicide or by the action of electrical discharges on monosilane and subsequent fractional condensation of the resulting silane mixture. However , it is preferable to obtain it directly by reducing hexachlorodisilane with lithium aluminum hydride .

Properties and use

Disilane is a colorless, unpleasantly smelling gas that ignites by itself on contact with air, producing silicon dioxide and water . When brought into contact with water, disilane is hydrolyzed . An explosive reaction occurs on contact with halogens or halogenated hydrocarbons , oxygen , bases and oxidizing agents . From 300 ° C, disilane decomposes into silicon and hydrogen .

In industry, disilane is used to coat products with amorphous silicon layers ( CVD process ) as well as in the production and cleaning of silicon-containing wafers (for integrated circuits ).

Individual evidence

  1. a b c d e f g h i Entry on disilane in the GESTIS substance database of the IFA , accessed on November 8, 2016(JavaScript required) .
  2. 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. 657.
  3. Wolfgang Legrum: Fragrances, between stink and fragrance , Vieweg + Teubner Verlag (2011) pp. 68–69, ISBN 978-3-8348-1245-2 .