Heptasulfur imide is the

inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...

with the formula . It is a pale yellow solid that is, like elemental sulfur, highly soluble in

carbon disulfide Carbon disulfide (also spelled as carbon disulphide) is an inorganic compound with the chemical formula and structure . It is also considered as the anhydride of thiocarbonic acid. It is a colorless, flammable, neurotoxic liquid that is used as ...

. The compound, which is only of academic interest, is representative of a family of sulfur imides (or azacyclosulfanes or thiacycloazanes) .

Synthesis and structure

It is prepared by reaction of

disulfur dichloride Disulfur dichloride (or disulphur dichloride by the British English spelling) is the inorganic compound of sulfur and chlorine with the Chemical formula, formula . It is an amber oily liquid. Sometimes, this compound is incorrectly named ''sulfur ...

with

ammonia Ammonia is an inorganic chemical compound of nitrogen and hydrogen with the chemical formula, formula . A Binary compounds of hydrogen, stable binary hydride and the simplest pnictogen hydride, ammonia is a colourless gas with a distinctive pu ...

, 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 Octasulfur is an inorganic substance with the chemical formula . It is an odourless and tasteless yellow solid, and is a major industrial chemical. It is the most common allotrope of sulfur Sulfur ( American spelling and the preferred IUP ...

(cyclooctasulfane) , with one replaced by . The center is almost planar,Hecht, H. J.; Reinhardt, R.; Steudel, R.; Bradaczek, H. "Redetermination of the crystal and molecular structure of heptasulfur imide, S₇NH" Zeitschrift für Anorganische und Allgemeine Chemie 1976, vol. 426, pp. 43-8. suggesting that the amine is nonbasic.

References

Inorganic amines Sulfur–nitrogen compounds Eight-membered rings Heterocyclic compounds with 1 ring {{inorganic-compound-stub