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-orderkinetics in permanganate and fractional-first-order dependence with respect to nicotine concentration. Theinfluence of hydrogen ion concentrations on the reaction rate showed inverse first-order kinetics in [H+] wherethe oxidation rates were increased with decreasing hydrogen ion concentration. A kinetic evidence for theformation of 1:1 complex has been revealed. The ionization constant of nicotine was calculated from the kineticdata 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 parametershave been evaluated and a tentative reaction mechanism consistent with the kinetic results is discussed.
Highlights
Nicotine is a highly lipid soluble alkaloid (Pailer M, 1964, p.15 & Smith L, 1971, p.174) which used effectively on a wide range against aphids, capsids, leaf miners and thrips
Reaction mixtures containing a slightly known excess of permanganate over that of nicotine substrate concentration at [H+] = 0.5 mol dm-3 were equilibrated at room temperature
Spectrophotometric estimation of the unreacted oxidant revealed that 1 mol of permanganate consumed 1.25±0.1 mol of nicotine
Summary
Nicotine is a highly lipid soluble alkaloid (Pailer M, 1964, p.15 & Smith L, 1971, p.174) which used effectively on a wide range against aphids, capsids, leaf miners and thrips. It is used for fumigation of green houses (Larson P, 1964, p.2). The kinetics of oxidation of many organic The oxidation of nicotine by this oxidant was investigated as a tool for spectrophotometric determination of nicotine concentration (Murthy V, 1986, p.78), but no attention was focused to either the kinetics or mechanistics of oxidation
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