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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.
==Synthesis and structure==
It is prepared by reaction of disulfur dichloride with ammonia,〔Becke-Goehring, Margot; Fluck, Ekkehard "Heptasulfur imide" Inorganic Syntheses 1966, vol. 8, 103-5. 〕 although other methods have been developed.〔Bojes, J.; Chivers, T.; Drummond, I. "Heptathiazocine(heptasulfurimide) and tetrabutylammonium tetrathionitrate" Inorganic Syntheses (1978), 18, 203-6. 〕 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,〔Hecht, H. J.; Reinhardt, R.; Steudel, R.; Bradaczek, H. "Redetermination of the crystal and molecular structure of heptasulfur imide, S7NH" Zeitschrift fuer Anorganische und Allgemeine Chemie 1976, vol. 426, pp. 43-8. 〕 suggesting that the amine is nonbasic.
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