Abstract
Optical rotatory dispersion (o.r.d.) and circular dichroism (c.d.) of poly(−)1,2-diaminopropane sebacamide I and of its model compound, N- N′-didecanoyl(−)1,2-diaminopropane II, are investigated in trifluoroethanol-formic acid, -trifluoroacetic, -methanesulphonic and -sulphuric acid mixtures, with emphasis on the two latter solvent systems. It is shown that the optical activity of both compounds depends on the nature and the concentration of the acid. The stronger the acid, the larger the chiroptical changes observed for a given value of the acid/amide molar ratio τ. The drastic changes caused by small amounts of methanesulphonic and sulphuric acids are assigned to protonation of amide chromophores solely.
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