Heptasulfur imide

Last updated
Heptasulfur imide
S7NHstructurePlanarN.png
Heptasulfur imide molecule ball.png
Names
IUPAC name
Heptathiazocane [1]
Other names
  • Azacyclooctasulfane
  • Heptasulfur imide
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • 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
AppearancePale 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).

Heptasulfur imide is the inorganic compound with the formula S 7 N H . 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, [2] although other methods have been developed. [3] Together with S7NH, the reaction also produces three isomers (1,3-S6(NH)2, 1,4-S6(NH)2 and 1,5-S6(NH)2) of S6(NH)2 (diazacyclooctasulfanes) and two isomers (1,3,5-S5(NH)3 and 1,3,6-S5(NH)3) of S5(NH)3 (triazacyclooctasulfanes). [4]

Azacyclooctasulfane is an analogue of octasulfur (cyclooctasulfane) S8, with one −S− replaced by −NH−. The S−NH−S center is almost planar, [5] 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. ↑ Greenwood, Norman Neill; Earnshaw, Alan (1997). Chemistry of the elements (2nd ed.). Oxford Auckland Boston [etc.]: Butterworth-Heinemann. ISBN   978-0-7506-3365-9.
  5. ↑ 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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