Cyclooctasulfur

Octasulfur is an inorganic chemical with the chemical formula S8. It is a yellow solid, and is odourless and tasteless. It is the most common allotrope of sulfur. It is a major industrial chemical that occurs widely in nature. Octasulfur is an inorganic chemical with the chemical formula S8. It is a yellow solid, and is odourless and tasteless. It is the most common allotrope of sulfur. It is a major industrial chemical that occurs widely in nature. The name octasulfur is the most commonly used; the preferred IUPAC name is cyclo-octasulfur. The substance is systematically named octathiocane, and cyclo-octasulfur. It is also the final member of the thiocane heterocylic series, where every carbon is substituted with a sulfur atom. The substance adopts a crown conformation with D4d point group symmetry. The S–S bond lengths are equal, at about 2.05 Å. Octasulfur crystallizes in three distinct polymorphs: rhombohedral, and two monoclinic forms, of which only two are stable at standard conditions. The rhombohedral crystal form is the accepted standard. The remaining polymorph is only stable between 96 and 115 °C at 100 kPa. Octasulfur forms several allotropes: α-Sulfur, β-sulfur, γ-sulfur, λ-sulfur.