Synthesis, characterisation and complex forming ability towards ferric ions of oligo(ether-amide)s of Jeffamines ED and chelidamic acid |
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Authors: | Milena IgnatovaMaurice Sepulchre Nevena Manolova |
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Institution: | a Institute of Polymers, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria b Laboratoire de Chimie Macromoléculaire, UMR 7610, Université Pierre et Marie Curie, 4 pl. Jussieu, 75252 Paris Cedex 05, France |
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Abstract: | New chelating oligo(ether-amide)s (CA-PE)s containing chelidamic acid residues in the main chain were prepared by reacting chelidamic acid with Jeffamines ED® in the presence of N,N′-dicyclohexylcarbodiimide and 4-dimethylaminopyridine. A mixture of products having one or two polyether sequences with chelidamate end-groups was obtained. It was found spectrophotometrically that CA-PE polymers formed a complex with Fe3+ at pH 3-6 having a maximum absorbance in the 472-495 nm range. Fe3+ ion complexes of CA-PE were water soluble, except Fe3+-CA-PE600. The stoichiometric ratio between chelidamic acid residues of oligo(ether-amide)s CA-PE and Fe3+ ions was found to be 2 at pH 5 by the method of shift of equilibrium. A hydroxypyridine structure of the chelidamic acid residues in the complex was suggested. |
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Keywords: | Chelidamic acid Jeffamines ED® Metal ion complexation |
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