The effects of cyclodextrin inclusion of the ferrocenemonocarboxylate anion on the kinetics of its oxidation by bis(pyridine-2,6-dicarboxylato)cobaltate(III) in aqueous solution |
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Authors: | Jerome A Imonigie Donal H Macartney |
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Institution: | (1) Department of Chemistry, Queen's University, K7L 3N6 Kingston, Ontario, Canada |
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Abstract: | The effects of -, -, dm -(heptakis(2,6-di-O-methyl)- -) and -cyclodextrins (CD) on the kinetics of the electron-transfer reaction of the ferrocenemonocarboxylate anion (FCA–) with bis(pyridine-2,6-dicarboxylato)cobaltate(III) have been investigated in aqueous solution (0.20 M Na2HPO4, pH 9.2) at 25.0°C. Substantial decreases in the rate constants for the electron-transfer reactions were observed upon cyclodextrin inclusion of the reductant, due to an increase in the FCA0/– reduction potential and to the insulation of the reductant from oxidant. The inclusion stability constants for {FCA·CD}– were evaluated from the1H NMR and kinetic data, and the order of the stability constants was found to be -CD dm -CD![Gt](/content/l4q221n597307j17/xxlarge8811.gif) -CD> -CD. |
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Keywords: | Cyclodextrins ferrocenemonocarboxylate bis(pyridine-2 6-dicarboxylato)cobaltate(III) electron transfer kinetics inclusion stability constants |
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