Germanium disulfide
Chemical compound
From Wikipedia, the free encyclopedia
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]
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| Names | |
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| Systematic IUPAC name
Germanium(IV) sulfide[1] | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.537 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| 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) |
| 0.45 g/100 mL | |
| Solubility | soluble in liquid ammonia |
| −53.3·10−6 cm3/mol | |
| Structure | |
| monoclinic, mP36 | |
| Pc, No. 7 | |
| 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 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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]
