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 ionic
strength 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.

 


Full Text: PDF DOI: 10.5539/ijc.v2n2p193

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International Journal of Chemistry   ISSN 1916-9698 (Print)   ISSN 1916-9701 (Online)

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