ISSN:
1573-1111
Schlagwort(e):
Cyclodextrin
;
viologens
;
surfactant
;
voltammetry
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract N-ethyl-N′-hexadecyl-4,4′-bipyridinium bromide (C16VBr2) andN-ethyl-N′-octadecyl-4,4′-bipyridinium bromide (C18VBr2) were used as electroactive probes to assess the interactions between surfactants and cyclodextrins. Cyclic voltammetry, visible spectroscopy, fluorescence spectroscopy and surface tension techniques were used to detect the formation of complexes between the surfactant viologen probes andα- andβ-cyclodextrins. The voltammetric results suggest the formation of inclusion compounds in which the hydrophobic tail of the surfactant viologens penetrate the cyclodextrin cavity. The dimerization of the viologen cation radicals is essentially suppressed by the presence ofα-cyclodextrin (ACD) while no effects are observed in the presence ofβ-cyclodextrin (BCD). The observed results are best explained by the relative solubility in aqueous media of each of the inclusion complexes in the several accessible viologen oxidation states.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01112788
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