Silicon disulfide

Crystal structure
__ Si 4+      __ S 2−
Space group	Ibam (No. 72)
General
Surname	Silicon disulfide
other names	Silicon (IV) sulfide
Ratio formula	SiS 2
Brief description	white solid with a rotten egg smell
External identifiers / databases
CAS number 13759-10-9 EC number 237-344-8 ECHA InfoCard 100.033.935 PubChem 83705 Wikidata Q2232750
properties
Molar mass	92.21 g mol −1
Physical state	firmly
density	2.02 g cm −3
Melting point	1090 ° C (sublimation)
solubility	Decomposes in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 261-300-315-319-335 EUH: 031 P: 231 + 232-301 + 310-305 + 351 + 338-302 + 352-405-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Silicon disulfide is an inorganic chemical compound of silicon from the group of sulfides .

Occurrence

It is believed that silicon disulfide occurs in circumstellar shells.

Extraction and presentation

Silicon disulfide can be obtained by reacting silicon dioxide with aluminum sulfide at 1200 to 1300 ° C., silicon monosulfide also being formed.

${\displaystyle \mathrm {3\ SiO_{2}+2\ Al_{2}S_{3}\longrightarrow 3\ SiS_{2}+2\ Al_{2}O_{3}} }$

The preparation by reaction of dry hydrogen sulfide with silicon at 1200 to 1300 ° C or the thermal decomposition of tetraethyl mercaptosilane Si (SC ₂ H ₅ ) ₄ at 250 to 300 ° C is also possible. It is also formed when the elements melt together at 1000 ° C.

properties

Silicon disulfide is a white, fibrous mass that is very sensitive to moisture and decomposes in water, ethanol and ammonia.

${\displaystyle \mathrm {SiS_{2}+2\ H_{2}O\longrightarrow SiO_{2}+2\ H_{2}S} }$

${\displaystyle \mathrm {SiS_{2}+2\ NH_{3}\longrightarrow Si(NH)_{2}+2\ H_{2}S} }$

It burns slowly when heated in air. Unlike silicon dioxide, it does not have a spatial network, but a fiber structure with distorted tetrahedrally coordinated silicon atoms. It is a distorted cubic closest packing of spheres in which a quarter of the tetrahedral holes are occupied by silicon atoms. It is an orthorhombic crystal structure with the space group Ibam (space group no. 72) . When heated under pressure, this changes into a cristobalite- like modification.

Individual evidence

1. ↑ ^{a b c d e f g} Data sheet Silicon (IV) sulfide, 95% from AlfaAesar, accessed on January 6, 2014 ( PDF )(JavaScript required) .
2. ^ Goebel, JH (1993): SiS ₂ in Circumstellar Shells . Astronomy and Astrophysics 278 (1): 226-230. bibcode : 1993A & A ... 278..226G .
3. ↑ ^{a b c d} Georg Brauer , with the assistance of Marianne Baudler a . a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 699 .
4. ^ ^{A b c d} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 916.
5. ↑ by Will Kleber , Hans-Joachim Bautsch , Joachim Bohm : Introduction to crystallography - Will Kleber, Hans-Joachim Bautsch, Joachim Bohm . Oldenbourg Verlag, 2010, ISBN 3-486-59885-6 , p. 157 ( limited preview in Google Book search).
6. ^ Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 734 ( limited preview in Google Book search).