| Popis: |
In the present work, we studied the electrochemical behavior, in non-aqueous medium (DMF) of several p-alkoxyacetophenones (butoxy-, hexyloxy-, octyloxy- and decyloxyacetophenone). We observed that the intensity of the first polarographic reduction wave is not proportional to the concentration of ketone. This fact due to the adsorption of the reduction product is more marked when the alkyl chain lengthens. Additions of β-cyclodextrin (β-CD) affect the reduction process of alkoxycetophenones. On one hand, the intensity of the first polarographic wave increases with additions of β-CD and, for the shortest alkyl chains, becomes again proportional to the concentration of ketones, on other hand the potentials of both the first and second wave are shifted towards less negative values. We observed that β-CD acts in DMF as proton donnor rather than host molecule. 1H NMR spectra (DMF d7) showed that β-CD/alkoxyacetophenones inclusion complexes, synthesised in aqueous medium, are dissociated in DMF. |
