Kinetics and Mechanism of Oxidation of Nicotine by Permanganate Ion in Acid Perchlorate Solutions
- Ishaq A. Zaafarany
Abstract
The kinetics of permanganate oxidation of nicotine alkaloid in aqueous perchlorate solutions at a constant ionicstrength of 1.0 mol dm-3 have been investigated spectrophotometrically. The kinetic results showed first-order
kinetics in permanganate and fractional-first-order dependence with respect to nicotine concentration. The
influence of hydrogen ion concentrations on the reaction rate showed inverse first-order kinetics in [H+] where
the oxidation rates were increased with decreasing hydrogen ion concentration. A kinetic evidence for the
formation of 1:1 complex has been revealed. The ionization constant of nicotine was calculated from the kinetic
data and was found to be 9.69x10-4 mol dm-3 at ionic strength of 1.0 mol dm-3 and 25o C. The kinetic parameters
have been evaluated and a tentative reaction mechanism consistent with the kinetic results is discussed.
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- DOI:10.5539/ijc.v2n2p193
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