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A Kinetic Assessment of the Rapid Iodination of Pyrrole in Aqueous Medium by Molecular Iodine using Hydrodynamic Voltammetry

Author Affiliations

  • 1 Department of Chemistry, Nowrosjee Wadia College, Pune, INDIA

Res.J.chem.sci., Volume 4, Issue (6), Pages 77-81, June,18 (2014)


The quantitative study of the rapid of iodination of pyrrole in aqueous medium using molecular iodine at 7 pH has been carried out at five different temperatures. The reaction was found to be very rapid and of second order having a half-life of 40 seconds and velocity constant 5000 M-1 s-1 at 30C. The rapidity of the reaction necessitated the use of a special technique, hydrodynamic voltammetry, to follow the course of the reaction. The energy of activation , entropy of activation and pre-exponential factor A for the reaction are evaluated as 56.16 kJ mol-1 , -64.35 J K-1mol-1and 6.96 x 109 M-1s-1respectively at 30C and 7 pH. The kinetic and related thermodynamic data obtained elucidate the high reactivity of the heterocycle under study.


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