Abstract
Electron transport in immobilized liquid membranes using a microporous polypropylene film as the support was studied in the reagent concentration independent regime and was kinetically controlled under the conditions employed in this study. The velocities depended on the concentration of the carrier (Vitamin K 3) in the membrane and varied exponentially with the reciprocal of the absolute temperature. Neither the membrane thickness, concentration of the oxidant (Fe( ophen) 3 3+) nor the concentration of reductant (S 2O 4 2- or MV + generated photochemically) affect the electron transport rate. Maximum velocities at 25°C (7.8 μmol-cm -2-hr -1 and 2.5 μmol-cm -2-hr - for the S 2O 4 2- and MV + driven reactions, respectively) were obtained in the pH range of 6-7 for the reductant compartment and in the 0 to - 1 pH range in the oxidant compartment. The respective turnover rates were 2.1 hr -1 and 0.65 hr -1 based on 2e -/Vitamin K 3 for the S 2O 4 2- and MV + driven reactions, respectively. The mechanism of electron transport is best interpreted to involve formation of the hydroquinone in the membrane which then reacts with Fe( o-phen) 3 3+ in the rate-limiting electron transfer step.
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