Heptasulfur imide

Heptasulfur imide
Names
	IUPAC name Heptathiazocane
	Other names Azacyclooctasulfane; Heptasulfur imide;
Identifiers
CAS Number	293-42-5;
3D model (JSmol)	Interactive image;
ChemSpider	2689062;
PubChem CID	3446506;
CompTox Dashboard (EPA)	DTXSID70392545 ;
	InChI InChI=1S/HNS7/c1-2-4-6-8-7-5-3-1/h1H Key: NLDXLSSPVWXKBF-UHFFFAOYSA-N;
	SMILES N1SSSSSSS1;
Properties
Chemical formula	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

Heptasulfur imide is the inorganic compound with the formula S₇N 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) S_x(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 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

^ 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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[1] ttps://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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