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, although other methods have been developed. Together with , the reaction also produces three isomers (1,3-, 1,4- and 1,5-) of (diazacyclooctasulfanes) and two isomers (1,3,5- and 1,3,6-) of (triazacyclooctasulfanes).
Azacyclooctasulfane is an analogue of octasulfur (cyclooctasulfane) , with one replaced by . The center is almost planar, suggesting that the amine is nonbasic.