Disilyne
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IUPAC name
Disilyne
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| Other names
Disilyn
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3D model (Jmol)
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| ChemSpider | |
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| Properties | |
| H2Si2 | |
| Molar mass | 58.19 g·mol−1 |
| Related compounds | |
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Related silyls
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Alkyne Silylene |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Disilyne, Si
2H
2, is a metalloid hydride composed of silicon and hydrogen. Disilyne is not well-characterised, and it is kinetically unstable with respect to isomerisation. The most stable isomer is a dibridged singlet, named di-μH-disilyne, followed by a monobridged μH-disilyne. A third, unbridged singlet ismomer is predicted to exist before disilyne - disilenylidene.
Substituted disilynes contain a formal silicon–silicon triple bond and as such are sometimes written R2Si2 (where R is a substituent group). They are the the silicon analogues of alkynes.
The term silyne has two different meanings. Some chemists use it refer to compounds containing a silicon–silicon triple bond, whereas others use the term to refer to compounds containing a silicon–carbon triple bond by analogy to silene, which often refers to compounds containing silicon–carbon double bonds. The term polysilyne can refer to the layer polymer (SiH)n or substituted derivatives.
The first example isolated and characterised by X-ray crystallography is an emerald green crystalline compound reported in 2004. This molecule has the structure:
where = HC(SiMe3)2 and = HCMe2
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