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 Sx(NH)y.

Heptasulfur imide
Skeletal formula of heptasulfur imide
Ball-and-stick model of the heptasulfur imide molecule
Names
IUPAC name
Azacyclooctasulfane
Other names
Heptasulfur imide
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/HNS7/c1-2-4-6-8-7-5-3-1/h1H
    Key: NLDXLSSPVWXKBF-UHFFFAOYSA-N
  • N1SSSSSSS1
Properties
S7NH
Molar mass 239.44 g·mol−1
Appearance Pale yellow solid
Density 2.01 g/cm3
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 [77 °F], 100 kPa).
Infobox references

Synthesis and structure

It is prepared by reaction of disulfur dichloride with ammonia,[1] although other methods have been developed.[2] Together with S7NH, the reaction also produces three isomers of S6(NH)2 and two isomers of S5(NH)3.

It is an analogue of octasulfur (cyclooctasulfane) S8, with one –S– replaced by –N(–H)–. The S2NH center is almost planar,[3] suggesting that the amine is nonbasic.

References
  1. Becke-Goehring, Margot; Fluck, Ekkehard "Heptasulfur imide" Inorganic Syntheses 1966, vol. 8, 103-5. doi:10.1002/9780470132395.ch26
  2. Bojes, J.; Chivers, T.; Drummond, I. "Heptathiazocine(heptasulfurimide) and tetrabutylammonium tetrathionitrate" Inorganic Syntheses (1978), 18, 203-6. doi:10.1002/9780470132494.ch36
  3. 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
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.