Effect of microemulsion-like polysoap on the catalysed esterolysis of hydrophobic p-nitrophenyl esters |
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Authors: | Abdesselam Benjelloun Pierre Lochon Alain Brembilla |
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Institution: | Laboratoire de Chimie-Physique Macromoléculaire, UMR CNRS-INPL 7568, ENSIC, 1 Rue Grandville, BP 451, 54001 Nancy Cedex, France |
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Abstract: | The esterolytic activity of metal ion complexes of n-alkyl-2-hydroxymethylbenzimidazoles/Zn2+ towards p-nitrophenyl esters (picolinates and alkanoates) was investigated in the presence of an amphiphilic polymer, poly(1-hexadecyl-3-vinylpyridinium bromide), as a macromolecular matrix. The reaction rate constants obtained for the polymer hydrophobic microdomains were compared with those observed for the new conventional surfactant, 3-ethyl-1-hexadecylpyridinium bromide, chosen as the model of the repeat unit of the homopolymer. In both cases, the kinetic analysis indicated that the esterolysis reaction proceeds through the formation of an initial binary complex Ligand–Zn2+, the stoichiometry of which is 2/1 type. |
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Keywords: | Hydrophobic p-nitrophenyl esters Alkyl-chain benzimidazole ligands Esterolysis activity Amphiphilic polymer microdomains Microenvironment effects |
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