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.
3D model (JSmol)
CompTox Dashboard (EPA)
|Appearance||pale yellow solid|
|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).
Synthesis and structureEdit
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 and two isomers of S5(NH)3.
It is an analogue of S8, with one S replaced by NH. The S2NH center is almost planar, suggesting that the amine is nonbasic.
- Becke-Goehring, Margot; Fluck, Ekkehard "Heptasulfur imide" Inorganic Syntheses 1966, vol. 8, 103-5. doi:10.1002/9780470132395.ch26
- Bojes, J.; Chivers, T.; Drummond, I. "Heptathiazocine(heptasulfurimide) and tetrabutylammonium tetrathionitrate" Inorganic Syntheses (1978), 18, 203-6. doi:10.1002/9780470132494.ch36
- 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