Authors
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Dudkina, M.M. ; Tenkovtsev, A.V. ; Komber, H. ; Häußler, L. ; Böhme, F.
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Title
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Competitive Influence of Carboxylic Groups in Ionic Complex Formation of 4-Hydroxybenzylidene Alkanones with Polyamidines
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Date
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16.11.2004
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Number
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12182
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Abstract
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Interactions of phenolic and carboxylic group containing chromophores (hydroxyarylidenealkanones) with polyamidines were investigated by UV/vis and <SUP>1</SUP>H NMR spectroscopy. Because of thestrong basicity of the polyamidines, deprotonation of the chromophores was observed. Deprotonation ofthe phenolic group is accompanied by a change of the electronic structure of the chromophore resultingin a strong bathochromic shift of the longest wavelength absorption band. Increased interactions areobserved after introduction of a carboxylic group into the chromophore. It could be shown thatdeprotonation of the carboxylic group is favored so that the deprotonation of the phenolic group onlystarts after a major part of the carboxylic groups is deprotonated. In highly diluted solutions, theinteraction of the carboxylic group with the polyamidine also increase the extent of deprotonation of thephenolic groups. A physical network formation is assumed that also increases the glass transitiontemperatures of the mixtures strongly.
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Publisher
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Macromolecules
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Wikidata
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Q108123795
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Citation
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Macromolecules 37 (2004) 8389-8393
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DOI
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https://doi.org/10.1021/MA049466I
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Tags
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polyelectrolyte-surfactant complexes
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