Registration Dossier
Registration Dossier
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EC number: 237-041-0 | CAS number: 13596-23-1
Endpoint summary
Administrative data
Description of key information
- Colourless inorganic liquid
- Melting point of -67°C
- Boiling point of 216°C
Octachlorotrisilane is a liquid at standard temperature and pressure. Literature Values are as follows (Haynes 2010):
Octachlorotrisilane reacts violently with water initially giving trisilan-octol (octahydroxytrisilane) and hydrochloric acid. Further hydrolysis of the Si-Si bonds in octahydroxytrisilane is expected to happen rapidly and produces monosilicic acid. This condenses at concentrations above 100-150 mg/L to give insoluble amorphous polysilicic acid type structures. Therefore, the water based properties have been waived on the basis of instability in water. The properties of the initial and final hydrolysis products, octahydroxytrisilane and (poly)silicic acid, are assessed instead. Both have high predicted water solubilities, but in reality the solubility is limited by the condensation reactions as discussed above. Their volatility is expected to be low. They are not surface active and do not undergo significant dissociation within the environmentally relevant pH range; the first dissociation constant is approximately 10.
Additional information
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