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Contents

   



(Top)
  


1 Synthesis, structure, and properties  




2 References  













Silicon disulfide






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From Wikipedia, the free encyclopedia
  

Silicon disulfide
Names
IUPAC name

silicon(IV) sulfide

Other names

silicon disulfide

Identifiers

CAS Number

3D model (JSmol)
  • polymer: Interactive image
    • ChemSpider
    ECHA InfoCard 100.033.935 Edit this at Wikidata

    PubChem CID
    UNII

    CompTox Dashboard (EPA)

    • InChI=1S/S2Si/c1-3-2 checkY

      Key: KHDSWONFYIAAPE-UHFFFAOYSA-N checkY

    • InChI=1/S2Si/c1-3-2

      Key: KHDSWONFYIAAPE-UHFFFAOYAO

    • monomer: S=[Si]=S

    • polymer: S=[Si](S0)S[Si]0(S0)S[Si]0(S0)S[Si]0(S0)S[Si]0(S0)S[Si]0(S0)S[Si]0=S

    Properties

    Chemical formula

    		 SiS2
    Molar mass 92.218 g/mol
    Appearance White (samples are sometimes grey or brown) needles.
    Rotten egg smell in moist air.
    Density 1.853 g/cm3
    Melting point 1,090 °C (1,990 °F; 1,360 K) sublimes

    Solubility in water

    		 Decomposes
    Structure

    Crystal structure

    		 Orthorhombic, oI12

    Space group

    		 Ibam, No.72[1]

    Coordination geometry

    		 Tetrahedral
    Hazards
    NFPA 704 (fire diamond)
    NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g. hydrogen peroxideSpecial hazards (white): no code
    2
    2
    3
    Related compounds

    Other anions

    		 silicon dioxide

    Other cations

    		 carbon disulfide
    germanium disulfide
    tin(IV) sulfide
    lead(IV) sulfide

    Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

    ☒N verify (what is checkY☒N ?)

    Infobox references

    Silicon disulfide is the inorganic compound with the formula SiS2. Like silicon dioxide, this material is polymeric, but it adopts a 1-dimensional structure quite different from the usual forms of SiO2.

    Synthesis, structure, and properties

    [edit]

    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(μS)2, etc.[2]

    Like other silicon sulfur-compounds (e.g., bis(trimethylsilyl)sulfide) SiS2 hydrolyzes readily to release H2S. In liquid ammonia it is reported to form the imide Si(NH)2 and NH4SH,[3] but a recent report has identified crystalline (NH4)2[SiS3(NH3)]·2NH3 as a product which contains the tetrahedral thiosilicate anion, SiS3(NH3)2-.[4]

    Reaction with ethanol gives the alkoxide tetraethyl orthosilicate and H2S.[3] With bulky tert-butanol, alcoholysis gives tris(tert-butoxy)silanethiol:[5]

    3 (CH3)3COH + SiS2 → [(CH3)3CO]3SiSH + H2S

    Reaction with sodium sulfide, magnesium sulfide and aluminum sulfide give thiosilicates.[3]

    SiS2 is claimed to occur in certain interstellar objects.[6]

    References

    [edit]
    1. ^ Weiss, A.; Weiss, A. (1954). "Über Siliciumchalkogenide. VI. Zur Kenntnis der faserigen Siliciumdioxyd-Modifikation". Zeitschrift für Anorganische und Allgemeine Chemie. 276 (1–2): 95–112. doi:10.1002/zaac.19542760110.
  • ^ Holleman, A. F.; Wiberg, E. (2001). Inorganic Chemistry. San Diego: Academic Press. ISBN 0-12-352651-5. A printing error in this book states that rSiSi is 214 picometers, when in fact that distance describes rSiS.
  • ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. p. 359. ISBN 978-0-08-022057-4.
  • ^ Meier, Martin; Korber, Nikolaus (2009). "The first thiosilicate from solution: synthesis and crystal structure of (NH4)2[SiS3(NH3)]·2NH3". Dalton Transactions (9): 1506–1508. doi:10.1039/b818856d. ISSN 1477-9226. PMID 19421590.
  • ^ R. Piękoś, W. Wojnowski (1962). "Untersuchungen über die Alkoholyse des SiS2. II. Darstellung von Trialkoxysilanthiolen und Tetraalkoxycyclodisilthianen aus den tertiären Alkoholen". Z. Anorg. Allg. Chem. 318 (3–4): 212–216. doi:10.1002/zaac.19623180310.
  • ^ Goebel, J. H. (1993). "SiS2 in Circumstellar Shells" (PDF). Astronomy and Astrophysics. 278 (1): 226–230. Bibcode:1993A&A...278..226G.


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