Germanium monosulfide or Germanium(II) sulfide is the
chemical compound
A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element ...
with the formula
Ge S. It is a
chalcogenide glass
Chalcogenide glass (pronounced hard ''ch'' as in ''chemistry'') is a glass containing one or more chalcogens ( sulfur, selenium and tellurium, but excluding oxygen). Such glasses are covalently bonded materials and may be classified as covalent ...
and a
semiconductor
A semiconductor is a material which has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals behave in the opposite way. ...
. Germanium sulfide is described as a red-brown powder or black crystals.
Germanium(II) sulfide when dry is stable in air, hydrolyzes slowly in moist air but rapidly reacts in water forming
Ge(OH)2 and then
GeO.
[E. G. Rochow, E. W. Abel ,1973, The Chemistry of Germanium Tin and Lead, Pergamon Press, ] It is one of a few sulfides that can be sublimed under vacuum without decomposition.
Preparation
First made by Winkler by reducing
GeS2 with Ge.
Other methods include reduction in a stream of
H2 gas,
or with an excess of
H3PO2 followed by vacuum sublimation.
Structure
It has a layer structure similar to that of black phosphorus.
The Ge-S distances range from 247 to 300 pm.
Molecular GeS in the gas phase has a
Ge-S bond length of 201.21 pm.
References
Germanium(II) compounds
Sulfides
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