Heptasulfur imide is the inorganic compound with the formula . It is a pale yellow solid that is, like elemental sulfur, highly soluble in carbon disulfide. The compound, which is only of academic interest, is representative of a family of sulfur imides (or azacyclosulfanes or thiacycloazanes) .
It is prepared by reaction of disulfur dichloride with ammonia,[1] although other methods have been developed.[2] Together with, the reaction also produces three isomers of (diazacyclooctasulfanes) and two isomers of (triazacyclooctasulfanes).
Azacyclooctasulfane is an analogue of octasulfur (cyclooctasulfane), with one replaced by . The center is almost planar,[3] suggesting that the amine is nonbasic.