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Hexachlorodisiloxane

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Hexachlorodisiloxane
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.035.504 Edit this at Wikidata
EC Number
  • 239-070-4
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Cl6OSi2/c1-8(2,3)7-9(4,5)6Key: QHAHOIWVGZZELU-UHFFFAOYSA-N
SMILES
  • O((Cl)(Cl)Cl)(Cl)(Cl)Cl
Properties
Chemical formula Cl6OSi2
Molar mass 284.87 g·mol
Density 1.575 g/cm
Melting point −33 °C (−27 °F; 240 K)
Boiling point 137 °C (279 °F; 410 K)
Hazards
GHS labelling:
Pictograms GHS02: FlammableGHS05: Corrosive
Signal word Danger
Hazard statements H223, H314, H335
Related compounds
Other anions Hexafluorodisiloxane
Other cations Perchloromethylether
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Hexachlorodisiloxane is a chemical compound composed of chlorine, silicon, and oxygen. Structurally, it is the symmetrical ether of two trichlorosilyl groups, and can be synthesized via high-temperature oxidation of silicon tetrachloride: 2 SiCl 4 + O 2 → 950 − 970 ∘ C 2 ( SiCl 3 ) 2 O + Cl 2 {\displaystyle {\ce {2SiCl4{}+O2->2(SiCl3)2O{}+Cl2}}}

At room temperature, it is a colorless liquid that hydrolyzes upon exposure to water to give silicon dioxide and hydrochloric acid: ( SiCl 3 ) 2 O + 3 H 2 O ⟶ 2 SiO 2 + 6 HCl {\displaystyle {\ce {(SiCl3)2O + 3H2O -> 2SiO2 + 6HCl}}} Intense heat evinces a similar decomposition: 2 ( SiCl 3 ) 2 O → Δ SiO 2 + 3 SiCl 4 {\displaystyle {\ce {2(SiCl3)2O->SiO2{}+3SiCl4}}}

Reaction with antimony trifluoride gives the analogous hexafluorodisiloxane.

Sources

  • Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
  • G. Brauer , ed. (1985). Руководство по неорганическому синтезу [Guide to Inorganic Synthesis] (in Russian). Vol. 3. Moscow: Mir. p. 392.
  • K. A. Adrianov (1955). Кремнийорганические соединения [Organosilicon Compounds] (in Russian). Moscow: State scientific and technical publishing house of chemical literature. p. 521.
  • Booth, Harold Simmons; Osten, Reuben Alexander (July 1945). "The Fluorination of Chlorodisiloxane / Silicon Oxyfluoride". Journal of the American Chemical Society. 67 (7): 1092–1096. doi:10.1021/ja01223a021.

References

  1. "C&L Inventory". echa.europa.eu.


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