Silicon disulfide is the
inorganic compound with the formula
Si S2. Like
silicon dioxide
Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula , most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand. Silica is one ...
, this material is
polymer
A polymer (; Greek '' poly-'', "many" + ''-mer'', "part")
is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Due to their broad spectrum of properties, both synthetic a ...
ic, but it adopts a 1-dimensional structure quite different from the usual
forms
Form is the shape, visual appearance, or configuration of an object. In a wider sense, the form is the way something happens.
Form also refers to:
*Form (document), a document (printed or electronic) with spaces in which to write or enter data
* ...
of SiO
2.
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
In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the o ...
, Si(μ-S)
2Si(μS)
2, etc.
Like other silicon sulfur-compounds (e.g.,
bis(trimethylsilyl)sulfide) SiS
2 hydrolyzes readily to release H
2S.
In liquid
ammonia
Ammonia is an inorganic compound of nitrogen and hydrogen with the formula . A stable binary hydride, and the simplest pnictogen hydride, ammonia is a colourless gas with a distinct pungent smell. Biologically, it is a common nitrogenous wa ...
it is reported to form the imide Si(NH)
2 and NH
4SH,
but a recent report has identified crystalline (NH
4)
2 iS3(NH3)�2NH
3 as a product which contains the tetrahedral thiosilicate anion, SiS
3(NH
3).
Reaction with ethanol gives the
alkoxide tetraethyl orthosilicate
Tetraethyl orthosilicate, formally named tetraethoxysilane (TEOS), ethyl silicate is the organic chemical compound with the formula Si(OC2H5)4. TEOS is a colorless liquid. It degrades in water. TEOS is the of orthosilicic acid, Si(OH)4. It i ...
and H
2S.
With bulky tert-butanol, alcoholysis gives
tris(tert-butoxy)silanethiol:
:3 (CH
3)
3COH + SiS
2 →
CH3)3COsub>3SiSH + H
2S
Reaction with
sodium sulfide,
magnesium sulfide
Magnesium sulfide is an inorganic compound with the formula Mg S. It is a white crystalline material but often is encountered in an impure form that is brown and non-crystalline powder. It is generated industrially in the production of metallic ...
and
aluminum sulfide give
thiosilicates.
SiS
2 is claimed to occur in certain interstellar objects.
References
Inorganic silicon compounds
Sulfides
Inorganic polymers
Dichalcogenides
{{Inorganic-compound-stub