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]
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]
