Selenium hexasulfide
Selenium hexasulfide is a chemical compound with the chemical formula. Its molecular structure is an 8-membered ring, consisting of two selenium and six sulfur atoms, analogous to the ring, an allotrope of sulfur, and other 8-membered rings of selenium sulfides with formula.
There are several isomers depending on the relative placement of the selenium atoms in the ring: 1,2-diselenacyclooctasulfane, 1,3-diselenacyclooctasulfane, 1,4-diselenacyclooctasulfane, and 1,5-diselenacyclooctasulfane. It is an oxidizing agent.
The 1,2 isomer can be prepared by reaction of chlorosulfanes and dichlorodiselane with potassium iodide in carbon disulfide. The reaction produces also cyclooctaselenium and all other eight-member cyclic selenium sulfides, except selenacyclooctasulfane, and several six- and seven-membered rings.