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Silicon disulfide is the
inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...
with the formula Si S2. Like
silicon dioxide Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula , commonly found in nature as quartz. In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and abundan ...
, this material is
polymer A polymer () is a chemical substance, substance or material that consists of very large molecules, or macromolecules, that are constituted by many repeat unit, repeating subunits derived from one or more species of monomers. Due to their br ...
ic, but it adopts a 1-dimensional structure quite different from the usual forms of SiO2.


Synthesis, structure, and properties

The material is formed by heating silicon and sulfur or by the exchange reaction between SiO2 and Al2S3. The material consists of chains of edge-shared tetrahedra, -Si(μ-S)2Si(μ-S)2-. Like other silicon sulfur-compounds (e.g., bis(trimethylsilyl)sulfide) SiS2 hydrolyzes readily to release H2S. In liquid
ammonia Ammonia is an inorganic chemical compound of nitrogen and hydrogen with the chemical formula, formula . A Binary compounds of hydrogen, stable binary hydride and the simplest pnictogen hydride, ammonia is a colourless gas with a distinctive pu ...
it is reported to form the imide Si(NH)2 and NH4SH, but a recent report has identified crystalline (NH4)2 iS3(NH3)�2NH3 as a product which contains the tetrahedral thiosilicate anion, SiS3(NH3)2-. Reaction with ethanol gives the alkoxide tetraethyl orthosilicate and H2S. With bulky tert-butanol, alcoholysis gives tris(tert-butoxy)silanethiol: :3 (CH3)3COH + SiS2 → CH3)3COsub>3SiSH + H2S Reaction with sodium sulfide, magnesium sulfide and aluminum sulfide give thiosilicates. SiS2 is claimed to occur in certain interstellar objects.


References

Inorganic silicon compounds Sulfides Inorganic polymers Dichalcogenides {{Inorganic-compound-stub