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.
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| Names | |
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| IUPAC name
Heptathiazocane[1]
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Other names
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| 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).
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Synthesis and structure
editIt 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 of S6(NH)2 (diazacyclooctasulfanes) and two isomers of S5(NH)3 (triazacyclooctasulfanes).[which?]
Azacyclooctasulfane is an analogue of octasulfur (cyclooctasulfane) S8, with one −S− replaced by −NH−. The S−NH−S center is almost planar,[4] suggesting that the amine is nonbasic.
References
edit- ^ https://pubchem.ncbi.nlm.nih.gov/compound/3446506#section=IUPAC-Name&fullscreen=true
- ^ 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
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