Polysulfide
![Two parallel monatomic sulfur chains grown inside a single-wall carbon nanotube (CNT, a). Zig-zag (b) and straight (c) S chains inside double-wall CNTs.[1]](/uploads/202502/15/S@CNT4429.jpg)
![Fragment of the solid-state structure of Na2S5. The S2−5 chain is evident.[3]](/uploads/202502/15/lossless-page1-220px-Na2S5Packing.tif4429.png)


Polysulfides are a class of chemical compounds containing chains of sulfur atoms. There are two main classes of polysulfides: anions and organic polysulfides. Anions have the general formula S2−
n. These anions are the conjugate bases of the hydrogen polysulfides H2Sn. Organic polysulfides generally have the formulae RSnR, where R = alkyl or aryl.