Octasulfur monoxide

Octasulfur monoxide is an inorganic compound with a chemical formula S₈O, discovered in 1972. It is a type of sulfur oxide.^[1]

Octasulfur monoxide

Names
Other names Cyclooctasulfane oxide Octathiocane oxide
Identifiers
CAS Number	35788-51-3 Y
3D model (JSmol)	Interactive image
ChemSpider	30654016
PubChem CID	139186352
InChI InChI=1S/OS8/c1-9-7-5-3-2-4-6-8-9 Key: ZNJJQQGMZXVPNK-UHFFFAOYSA-N
SMILES O=S1SSSSSSS1
Properties
Chemical formula	S8O
Molar mass	272.48 g·mol−1
Appearance	Yellowish sharp crystal[1]
Density	2.13 g·cm−3
Solubility	0.8 g[clarification needed]（carbon disulfide)[1]
Structure[2]
Crystal structure	Orthorhombic
Space group	Pca21
Lattice constant	a = 13.197, b = 7.973, c = 8.096
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

A crystalline compound composed of cyclooctasulfur monoxide and antimony pentachloride in equimolar quantities can be made (S₈O·SbCl₅).^[3]