Germanium disulfide

Germanium disulfide or Germanium(IV) sulfide is the inorganic compound with the formula GeS₂. It is a white high-melting crystalline solid.^[1][2] The compound is a 3-dimensional polymer,^[3][4] in contrast to silicon disulfide, which is a one-dimensional polymer. The Ge-S distance is 2.19 Å.^[3]

Germanium disulfide

Ball and stick model of crystalline germanium sulfide.
Names
Systematic IUPAC name Germanium(IV) sulfide[1]
Identifiers
CAS Number	12025-34-2 Y
3D model (JSmol)	Interactive image
ChemSpider	74732 Y
ECHA InfoCard	100.031.537
EC Number	234-705-1
PubChem CID	82816
CompTox Dashboard (EPA)	DTXSID2065177
InChI InChI=1S/GeS2/c2-1-3 Y Key: YIZVROFXIVWAAZ-UHFFFAOYSA-N Y InChI=1/GeS2/c2-1-3 Key: YIZVROFXIVWAAZ-UHFFFAOYAU
SMILES S=[Ge]=S
Properties
Chemical formula	GeS2
Molar mass	136.75 g·mol−1
Appearance	White, translucent crystals
Density	2.94 g cm−3
Melting point	840 °C (1,540 °F; 1,110 K)
Boiling point	1,530 °C (2,790 °F; 1,800 K)
Solubility in water	0.45 g/100 mL
Solubility	soluble in liquid ammonia
Magnetic susceptibility (χ)	−53.3·10−6 cm3/mol
Structure
Crystal structure	monoclinic, mP36
Space group	Pc, No. 7
Coordination geometry	tetrahedral at Ge, bent at S
Thermochemistry
Heat capacity (C)	50 J /(mol K)
Std enthalpy of formation (ΔfH⦵298)	−150.06 kJ/mol
Related compounds
Related compounds	Carbon disulfide Germanium dioxide Germanium diselenide Germanium monosulfide Lead disulfide Silicon sulfide Tin disulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Isolation, production, reactions

Germanium disulfide was first found in samples of argyrodite. The fact that germanium sulfide does not dissolve in aqueous acid facilitated its isolation.^[5]

Germanium disulfide is produced by treating a solution of germanium tetrachloride in a concentrated hydrochloric acid solution with hydrogen sulfide. It precipitates as a white solid.^[6]

It is insoluble in water, it dissolves in aqueous solutions of sodium sulfide owing to the formation of thiogermanates:

GeS₂ + Na₂S → Na₂GeS₃

Natural occurrence

Natural GeS₂ is restricted to fumaroles of some burning coal-mining waste heaps.^[7]