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Contents Vol 65(11)

Role of H+ in Polypyrrole and Poly(3,4-ethylenedioxythiophene) Formation Using FeCl3·6H2O in the Room Temperature Ionic Liquid, C4mpyrTFSI

Graeme A. Snook A , Anand I. Bhatt B D , Muhammad E. Abdelhamid A C and Adam S. Best B
+ Author Affiliations
- Author Affiliations

A Commonwealth Scientific and Industrial Research Organisation (CSIRO), Process Science and Engineering, Box 312, Clayton, Vic. 3169, Australia.

B Commonwealth Scientific and Industrial Research Organisation (CSIRO), Energy Technology, Box 312, Clayton, Vic. 3169, Australia.

C RMIT University, School of Applied Sciences, Melbourne, Vic. 3001, Australia.

D Corresponding author. Email: Anand.Bhatt@csiro.au

Australian Journal of Chemistry 65(11) 1513-1522 https://doi.org/10.1071/CH12322
Submitted: 6 July 2012  Accepted: 10 August 2012   Published: 10 September 2012

Abstract

The polymerisation reaction of pyrrole and 3,4-ethylenedioxythiophene using the chemical oxidant FeCl3·6H2O in the room temperature ionic liquid butyl-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (C4mpyrTFSI) has been investigated using cyclic voltammetry, UV/vis and IR spectroscopy. The voltammetric data for the Fe2+/3+ reaction is complicated by the presence of H+ introduced upon dissolution of the iron salt by deprotonation of the coordinated waters. The voltammetric and chemical reaction studies show that H+ itself, introduced to solution as trifluoromethanesulfonic acid (HTFSI), can act as the chemical oxidant for the polymerisation reaction. Voltammetric data also implies that in this system the Fe2+/3+ redox couple may not actually be involved in the polymerisation reaction and that the H+ introduced upon dissolution of the FeCl3·6H2O may be the sole cause of the oxidation reaction.


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