Tetrasulfur tetraimide

It explodes on heating in a flame. The structure may be the indicated linear polymer of tetrasulfur tetraimidate rings linked by pairs of dimercury bonds. 

A number of other sulfur-nitrogen compounds are known. Generally, they contain at least one other type of atom and are prepared from S4N4. For example, tetrasulfur tetraimide is obtained by the reduction of S4N4. In fact, a series of sulfur imides having the formula S (NH)8 are known, as are some halogen derivatives. 

Two Other molecules indicating the influence of fluorine substitution on d orbital participation are S4N4H, and N4S4F4 (see Chapter 16). Tetrasulfur tetraimide is isoeiectronic with the Sj molecule and so the structure... 

Double bonding in this molecule is clearly shown by the alternation in S—N bond lengths in the ring (see Fig. 16.30b). Now both the above electronic structure for S4N4F4 and that for S4N4H4 are reasonable but raise the que.stion Why doesn t tetrasulfur tetraimide isomerize from the N-substituted form to the S-substituted form isoeiectronic with the fluoride ... 

Reduction of tetrasulfur telranitride with tintII) chloride produces tetrasulfur tetraimide. S4(NH)4, isoetectronic with sulfur. S . Like sulfur, the tetraimide also exists in a crown configuration. As S and NH are isoelectronic. it has been possible to produce a scries of ring compounds. S,lNH)K t. that includes all possible isomers except those with N—N bonds. 

As has already been mentioned, it is possible formally to replace not only one or two sulfur atoms in its eight-membered ring [Formula (I)] by NH, but also four such atoms. In this way one obtains tetrasulfur tetraimide (XIII). 

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