Germanium (IV) sulfide

Crystal structure
__ Ge 4+      __ S 2−
Crystal system	tetragonal
Space group	I 4 2 d (No. 122)
Lattice parameters	a = 5.48  Å , c = 9.143 Å
General
Surname	Germanium (IV) sulfide
other names	Germanium disulfide
Ratio formula	GeS 2
Brief description	colorless solid
External identifiers / databases
CAS number 12025-34-2 EC number 234-705-1 ECHA InfoCard 100,031,537 PubChem 82816 Wikidata Q2420582
properties
Molar mass	136.77 g mol −1
Physical state	firmly
density	2.94 g cm −3
Melting point	940 ° C
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Germanium (IV) sulfide is an inorganic chemical compound of germanium from the group of sulfides . It was the first germanium compound that Clemens Winkler found while analyzing argyrodite . The fact that the compound had a different solubility than other sulfides made it possible for him to isolate the new element.

Extraction and presentation

Germanium (IV) sulfide can be obtained by reacting germanium (IV) oxide dissolved in hydrochloric acid or sulfuric acid with hydrogen sulfide .

${\displaystyle {\ce {GeO2 + 2H2S -> GeS2 + 2H2O}}}$

It also arises from the elements at 1100 ° C under pressure.

properties

Germanium (IV) sulfide is a colorless solid that is difficult to wet with water. At around 800 ° C, it melts into a dark liquid that solidifies as an amber-yellow, transparent mass. It is soluble in alkalis as a thio salt. At 800 ° C it is volatile in an inert atmosphere. The compound is polymeric like silicon disulfide under normal conditions . It comes in several forms. So with orthorhombic crystal structure and space group Fdd 2 (space group no.43 ) , but also as a monoclinic form with space group P 2 ₁ / c ( no.14 ) or tetragonal in space group I 4 2 d (space group no.122) .

Individual evidence

1. ↑ ^{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. 736 .
2. ^ ^{A b c} Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 476 ( limited preview in Google Book search).
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
4. ↑ Clemens Winkler: Mittheilungen about the germanium. In: Journal for Practical Chemistry. 34, 1886, pp. 177-229, doi : 10.1002 / prac.18860340122 .
5. ^ ^{A b} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1922.
6. ^ M. Rubenstein, G. Roland: A monoclinic modification of germanium disulfide, GeS2. In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 27, pp. 505-506, doi : 10.1107 / S0567740871002450 .
7. ^ CT Prewitt, HS Young: Germaniun and Silicon Disulfides: Structure and Synthesis . In: Science . tape 149 , no. 3683 , July 30, 1965, p. 535-537 , doi : 10.1126 / science.149.3683.535 .