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. Germanium sulfide is a red-brown powder or black crystals.
It 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. It also forms
chalcogenide glass
Chalcogenide glass (pronounced hard ''ch'' as in ''chemistry'') is a glass containing one or more heavy chalcogens (sulfur, selenium or tellurium; polonium is also a heavy chalcogen but too radioactive to use). Chalcogenide materials behave rather ...
es and is a
semiconductor
A semiconductor is a material with electrical conductivity between that of a conductor and an insulator. Its conductivity can be modified by adding impurities (" doping") to its crystal structure. When two regions with different doping level ...
.
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
{{Sulfides
Germanium(II) compounds
Monosulfides