On the stabilization of conducting pernigraniline salt by the synthesis and oxidation of polyaniline in hydrophobic ionic liquids

• Published in: Physical chemistry chemical physics : PCCP Vol. 10; no. 10; pp. 1457 - 1462
• Main Authors: BAZITO, Fernanda F. C, SILVEIRA, Leonardo T, TORRESI, Roberto M, DE TORRESI, Susana I. Cordoba
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 14.03.2008
• Subjects: Aniline Compounds - chemical synthesis; Aniline Compounds - chemistry; Chemistry; Electric Conductivity; Electrochemistry; Exact sciences and technology; General and physical chemistry; Hydrophobic and Hydrophilic Interactions; Imidazoles - chemistry; Ionic Liquids - chemistry; Membranes, Artificial; Molecular Structure; Oxidation-Reduction; Salts - chemistry; Time Factors; Film; Stabilization; In situ; Conductivity; Polymerization; Hydrophobicity; Potential; Ionic liquid; Characterization; Degradation; Resistance; Imide; Synthesis; Acids; Electrochemistry; Oxidation; Raman spectrometry; Room temperature; Aniline polymer
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/b714458j

The electrochemical polymerization of aniline in a hydrophobic room-temperature ionic liquid and the spectroelectrochemical characterization of the formed film are presented. The polymerization occurs without the presence of acid in 1-butyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide (BMMITFSI), leading to a very stable electroactive material where no degradation was observed even at high applied potentials. Both in situ UV-Vis and Raman spectroscopic studies provided evidence for the stabilization of pernigraniline salt at high oxidation potentials and that this polyaniline state is the conducting form, as was corroborated by in situ resistance measurements. These data are indicative that low conductivity is not an intrinsic property of pernigraniline salt and this point must be reconsidered.