Trisilane is the silane with the formula H2Si(SiH3)2. A liquid at standard temperature and pressure, it is a silicon analogue of propane. In contrast with propane, however, trisilane ignites spontaneously in air.[2]
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Names | |||
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IUPAC name
Trisilane
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Identifiers | |||
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3D model (JSmol)
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ChemSpider |
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ECHA InfoCard | 100.132.113 | ||
EC Number |
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PubChem CID
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UNII |
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UN number | 3194 | ||
CompTox Dashboard (EPA)
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Properties | |||
H8Si3 | |||
Molar mass | 92.319 g·mol−1 | ||
Appearance | Colourless liquid | ||
Odor | Unpleasant | ||
Density | 0.743 g cm−3 | ||
Melting point | −117 °C (−179 °F; 156 K) | ||
Boiling point | 53 °C (127 °F; 326 K) | ||
Slowly decomposes[1] | |||
Vapor pressure | 12.7 kPa | ||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards
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Pyrophoric | ||
GHS labelling: | |||
Danger | |||
H250, H261, H315, H319, H335 | |||
P210, P222, P231+P232, P261, P264, P271, P280, P302+P334, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P402+P404, P403+P233, P405, P422, P501 | |||
Flash point | < −40 °C (−40 °F; 233 K) | ||
< 50 °C (122 °F; 323 K) | |||
Related compounds | |||
Related hydrosilicons
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Disilane Disilyne Silane Silylene | ||
Related compounds
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Propane | ||
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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Trisilane was characterized by Alfred Stock having prepared it by the reaction of hydrochloric acid and magnesium silicide.[3][4] This reaction had been explored as early as 1857 by Friedrich Woehler and Heinrich Buff, and further investigated by Henri Moissan and Samuel Smiles in 1902.[2]
The key property of trisilane is its thermal lability. It degrades to silicon films and SiH4 according to this idealized equation:
In terms of mechanism, this decomposition proceeds by a 1,2 hydrogen shift that produces disilanes, normal and isotetrasilanes, and normal and isopentasilanes.[5]
Because it readily decomposes to leave films of Si, trisilane has been explored a means to apply thin layers of silicon for semiconductors and similar applications.[6] Similarly, thermolysis of trisilane gives silicon nanowires.[7]