Hexachlorodisiloxane
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CAS Number
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3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.035.504 |
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PubChem CID
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CompTox Dashboard (EPA)
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InChI
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SMILES
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| Properties | |
Chemical formula
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Cl6OSi2 |
| Molar mass | 284.87 g·mol−1 |
| Density | 1.575 g/cm3 |
| Melting point | −33 °C (−27 °F; 240 K) |
| Boiling point | 137 °C (279 °F; 410 K) |
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Pictograms
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Signal word
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Hazard statements
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H223, H314, H335 |
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Other anions
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Hexafluorodisiloxane |
Other cations
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Perchloromethylether |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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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:
![{\displaystyle {2\,\mathrm {SiCl} {\vphantom {A}}_{\smash[{t}]{4}}{}+{}\mathrm {O} {\vphantom {A}}_{\smash[{t}]{2}}{}\mathrel {\xrightarrow {950{}-{}970{\vphantom {A}}^{\circ }{\text{C}}} } {}2\,(\mathrm {SiCl} {\vphantom {A}}_{\smash[{t}]{3}}){\vphantom {A}}_{\smash[{t}]{2}}\mathrm {O} {}+{}\mathrm {Cl} {\vphantom {A}}_{\smash[{t}]{2}}}}](./_assets_/eb734a37dd21ce173a46342d1cc64c92/2dc2913c5efcb8cf17dc44d7907e1f2d7dc7f67a.svg)
At room temperature, it is a colorless liquid that hydrolyzes upon exposure to water to give silicon dioxide and hydrochloric acid: Intense heat evinces a similar decomposition:
![{\displaystyle {(\mathrm {SiCl} {\vphantom {A}}_{\smash[{t}]{3}}){\vphantom {A}}_{\smash[{t}]{2}}\mathrm {O} {}+{}3\,\mathrm {H} {\vphantom {A}}_{\smash[{t}]{2}}\mathrm {O} {}\mathrel {\longrightarrow } {}2\,\mathrm {SiO} {\vphantom {A}}_{\smash[{t}]{2}}{}+{}6\,\mathrm {HCl} }}](./_assets_/eb734a37dd21ce173a46342d1cc64c92/26913ab2da0770038718db4d075e98a4a4e1bb6b.svg)
![{\displaystyle {2\,(\mathrm {SiCl} {\vphantom {A}}_{\smash[{t}]{3}}){\vphantom {A}}_{\smash[{t}]{2}}\mathrm {O} {}\mathrel {\xrightarrow {\mathrm {\Delta } } } {}\mathrm {SiO} {\vphantom {A}}_{\smash[{t}]{2}}{}+{}3\,\mathrm {SiCl} {\vphantom {A}}_{\smash[{t}]{4}}}}](./_assets_/eb734a37dd21ce173a46342d1cc64c92/f3b079700d479df25172496feaa5ac5499813cb8.svg)
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 [Брауэр Г.], ed. (1985). Руководство по неорганическому синтезу [Guide to Inorganic Synthesis] (in Russian). Vol. 3. Moscow: Mir. p. 392.
- K. A. Adrianov [Адрианов К. А.] (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. Bibcode:1945JAChS..67.1092B. doi:10.1021/ja01223a021.
References
- ^ "C&L Inventory". echa.europa.eu.