Band-Shape Analysis of the Electronic Spectra of the Schiff Bases of 5'-Deoxypyridoxal and n-Hexylamine in Cationic Micelles

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We analyzed the UV-visible absorption spectra of the Schiff bases formed between 5'-deoxypyridoxal (DPL) and n-hexylamine (HEX) in aqueous media of various ionic strengths containing different concentrations of the cationic surfactant hexadecyltrimethylammonium bromide (CTAB). According to the results obtained, the hydrophobic chains of the surfactant interact with the hydrocarbon chain of the imine, thereby displacing the tautomeric equilibrium to the enol form. An increase in the electrolyte concentration also lowers the polarity of the environment where the Schiff base lies, thus also increasing the proportion of the enol form. The results obtained in this micellar medium suggest that the system can be used as a model for hydrophobic media.

Keywords: CTAB; DPL; Schiff base

Document Type: Research Article


Affiliations: 1: Department of Physical Chemistry, Faculty of Sciences, University of Alcalá de Henares, E-28871 Alcalá de Henares, Spain 2: Department of Chemistry, Faculty of Sciences, University of the Balearic Islands, E-07080 Palma de Mallorca, Spain 3: Department of Physical Chemistry, Faculty of Pharmacy, Complutense University, E-28040 Madrid, Spain

Publication date: December 1, 1992

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