Germanium monosulfide

Germanium monosulfide or Germanium(II) sulfide is the chemical compound with the formula GeS. Germanium sulfide is a red-brown powder or black crystals.^[1] It hydrolyzes slowly in moist air but rapidly reacts in water forming Ge(OH)₂ and then GeO.^[2] It is one of a few sulfides that can be sublimed under vacuum without decomposition.^[3] It also forms chalcogenide glasses and is a semiconductor.^[4]

Germanium monosulfide

Names
Systematic IUPAC name Germanium(II) sulfide
Identifiers
CAS Number	12025-32-0
3D model (JSmol)	Interactive image
ChemSpider	4897590
ECHA InfoCard	100.031.536
PubChem CID	6367215
CompTox Dashboard (EPA)	DTXSID20923282
InChI InChI=1S/GeS/c1-2 Key: VDNSGQQAZRMTCI-UHFFFAOYSA-N
SMILES S=[Ge]
Properties
Chemical formula	GeS
Molar mass	104.69 g·mol−1
Related compounds
Related compounds	Carbon monosulfide Germanium monoxide Germanium disulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

First made by Winkler by reducing GeS₂ with Ge.^[2] Other methods include reduction in a stream of H₂ gas,^[2] or with an excess of H₃PO₂ followed by vacuum sublimation.^[1]

Structure

It has a layer structure similar to that of black phosphorus.^[1] The Ge-S distances range from 247 to 300 pm.^[2] Molecular GeS in the gas phase has a Ge-S bond length of 201.21 pm.^[5]