Sulphuryl amide

W. Traube and E. Reubke found that sulphuryl amide dissolves 1-4 mol. proportions of ammonia at 20° 3-0, at 0° and 5-4 at —20°. The product has an electrical conductivity 150 times that of ar 42V-aq. soln. of sulphuryl amide and the conductivity is 25 times that of a 42V-soln. of ammonia alone. It is therefore assumed that sulphuryl amide can exist in an oei-form ... 

The needle-like crystals have no colour or smell, but have a strong acidic taste. They are not readily dissolved by water, they are not hygroscopic, and are fairly stable. The compound is at once decomposed by water at 0° into amidosulphonie acid and sulphuryl amide HN(S02.NH2)2+H20=S02(NH2)2+NH2.HS03. The mol. wt. determinations of the salt in aq. soln., and the electrical conductivity confirm this reaction. The electrical conductivity of aq. soln. gives values corresponding with those for amidosulphonie acid, since the sulphuryl amide also produced is not an electrolyte. The compound is insoluble in benzene, and chloroform ... 

So, it seemed interesting to study the influence of substitutes in sulphuryl amides concerning light stabilizing effect intensity. For this purpose we modified cellulose diacetate (CDA) with the help of sulphuryl amide derivatives of carbazole and indan. 

These synthesized sulphuryl amide were used for cellulose diacetate (CDA) modification. The obtained samples were formed as films and radiated by mercmy vapour lamp in the air during the period of 24 hours at T 35°C. Change of viscosity of cellulose diacetate solution before and after irradiation was considered as the index of stabilizing effect of additions -modifiers[182]. 

Tables 19 and 20 display the experimental results of sulphuryl amide derivatives of carbazole and indan stabilizing effect.

Table 19. Viscosity maintenance in CDA- films containing carbazole sulphuryl amide additions in ultra-violet radiation...

As it is established in [183], aromatic sulphuryl amides can exist in solid state in the form of open or cyclic dimers owing to intermolecular hydrogen bonds. 

Studying ultra-violet spectrums of indan derivatives let us make a supposition about their "shield" mechanism, which causes light stabilizing effect, as indan sulphuryl amide additions (as carbazolsulphonamides) absorb radiation in the same wave length interval as cellulose diacetate. 

Figure 2.31. U-v spectrum of absorption in CDA - films, containing 2% ofXX indan sulphuryl amide to polymer mass 1- CDA - film before irradiation 2-after 24 hours u-v - irradiation.

It is important to notice, that sulphuryl amides derivatives of both indan and carbazole have a number of valuable properties of practical application they are resistant to thermical shock (T decomp =120-300°C) non-toxic (LD5o=lOOO mg/kg) well consistent with CDA in common solvents acquire small volatility. 

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