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Heptasulfur imide

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Heptasulfur imide
Skeletal formula of heptasulfur imide
Ball-and-stick model of the heptasulfur imide molecule
Names
IUPAC name Heptathiazocane
Other names
  • Azacyclooctasulfane
  • Heptasulfur imide
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/HNS7/c1-2-4-6-8-7-5-3-1/h1HKey: NLDXLSSPVWXKBF-UHFFFAOYSA-N
SMILES
  • N1SSSSSSS1
Properties
Chemical formula S7NH
Molar mass 239.44 g·mol
Appearance Pale yellow solid
Density 2.01 g/cm
Melting point 113.5 °C (236.3 °F; 386.6 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

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) Sx(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 −S− replaced by −NH−. The S−NH−S center is almost planar, suggesting that the amine is nonbasic.

References

  1. https://pubchem.ncbi.nlm.nih.gov/compound/3446506#section=IUPAC-Name&fullscreen=true
  2. Becke-Goehring, Margot; Fluck, Ekkehard "Heptasulfur imide" Inorganic Syntheses 1966, vol. 8, 103-5. doi:10.1002/9780470132395.ch26
  3. Bojes, J.; Chivers, T.; Drummond, I. "Heptathiazocine(heptasulfurimide) and tetrabutylammonium tetrathionitrate" Inorganic Syntheses (1978), 18, 203-6. doi:10.1002/9780470132494.ch36
  4. 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. doi:10.1002/zaac.19764260106
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