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IJSTR >> Volume 3- Issue 7, July 2014 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Kinetic Approach To The Mechanism Of P-Bis(Dimethylamino)-Phenothiazin-5-Ium Chloride Sulphate Ion In Acidic Medium

[Full Text]



Babatunde OA, Umoru, Patricia Ese



Key words: kinetics, reaction mechanism, stoichiometry, sulphate ion and methylene blue.



ABSTRACT: The kinetics and mechanism of p-Bis(dimethylamino)-phenothiazin-5-ium chloride by sulphate ion has been investigated in perchloric acid. The progress of the reactions was monitored by observing the decrease in absorbance of the oxidant at λ max of 663 nm UV/Vis Spectrumlab 752s spectrophotometer. The results showed a stoichiometry of 1:2, first-order dependence in both oxidant and reductant. The second order rate equation at constant temperature is therefore given as: -d[MB]/dt= k2[MB][SO42-] where k2 = 4.86 dm3 mol-1 min-1 A positive primary salt effect was observed and an increase in the concentration of hydrogen ion as well dielectric constant increased the rate of reaction. Added ions did not show any effect on the rate of reaction. The result of spectroscopic and kinetic investigation did not indicate intermediate complex formation in the course of the reaction. A plausible mechanism for the reaction has been proposed in line with the outer-sphere reaction pathway.



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