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E-Journal of Chemistry
Volume 8, Issue 3, Pages 1086-1093

Methylene Blue Sensitized Photodechlorination of Isomeric Mono- and Dichloroanilines via Molecular Complex Formation Mechanism

U. C. Pande and A. H. Dwivedi

Department of Chemistry, University School of Science, Gujarat University, Navrangpura, Ahmedabad-380 009, Gujarat, India

Received 5 December 2010; Accepted 23 January 2011

Copyright © 2011 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The photosensitized dechlorination of isomeric mono- and dichloroanilines has been studied using methylene blue as photosensitizer in alkaline medium. The dechlorination products have been identified and formation of molecular complex between aniline and methylene blue has been observed. The effects of the pH, concentration of the sensitizer, concentration of the substrate, the intensity of the light and the temperature on the rate of the reaction have been studied. The quantum efficiency of the photodechlorination has been evaluated. The mechanism of the photodechlorination has been suggested.