Heptasulfur imide

Heptasulfur imide is the inorganic compound with the formula S7NH. 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) S_{x}(NH)_{y}.

Synthesis and structure
It is prepared by reaction of disulfur dichloride with ammonia, although other methods have been developed. Together with S7NH, the reaction also produces three isomers of S6(NH)2 (diazacyclooctasulfanes) and two isomers of S5(NH)3 (triazacyclooctasulfanes).

Azacyclooctasulfane is an analogue of octasulfur (cyclooctasulfane) S8, with one \sS\s replaced by \sNH\s. The S\sNH\sS center is almost planar, suggesting that the amine is nonbasic.