3D model (JSmol)
|Molar mass||78.22 g·mol−1|
|Melting point||−144 °C (−227 °F; 129 K)|
|Boiling point||−15.2 °C (4.6 °F; 257.9 K)|
|Safety data sheet||See: data page|
|Supplementary data page|
|Refractive index (n),
Dielectric constant (εr), etc.
|UV, IR, NMR, MS|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Properties and bonding
Disiloxane is a molecule with six equivalent Si-H bonds and two equivalent Si-O bonds.
Today, DSO is primarily produced by converting silane or silicon via gasification to a mixture of silicon monoxide, and hydrogen. This mixture is then converted into DSO in the presence of a catalyst. As described, this is a one-step (direct synthesis) process that permits both silanol synthesis and dehydration in the same process unit, with no silanol isolation and purification. Disiloxane reacts at low temperatures with aluminium halides to give the corresponding silyl and silylene halides and monosilane. Disiloxane is generally considered to be stable in water. It is more soluble than dimethyl ether. It hydrolyses very slowly:
- H3SiOSiH3 + 3 H2O → 2 SiO2 + 6 H2
Alternatively disiloxane can be prepared in the lab according to the following reactions:
- H3SiX + H2O → H3SiOH + HX
- 2 H3SiOH → H3SiOSiH3 + H2O
Unlike dimethyl ether, it can be produced via autocondensation without a catalyst, as silanol is relatively unstable.
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