13C NMR-Spektroskopische Untersuchungen über den Einfluß anorganischer Salze auf die Solvatation von N,N′-Dibenzoyl-m-phenylendiamin in N,N-Dimethylacetamid

Changes of the solvation sphere of N,N′-dibenzoyl-m-phenlyenediamine (as a model substance for aromatic polyamides) in N,N′-dimethylacetamide caused by electrolytes such as LiCl, LiBr or BeCl2 were studied by 13C NMR chemical shift measurements. The observed variations of the chemical shift data were interpreted by a stronger interaction of the solvent molecules with the carbonamide group. The relation of the carbonyl and the amide group interaction with the solvent or the solvated cations depends on the kind of electrolyte. It is not possible to correlate the obtained results with the influence of these electrolytes upon the molecular weight of the aromatic polyamides prepared in N,N′-dimethylacetamide. Therefore some possible explanations are discussed.