The reaction of polyaniline with iodine |
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Authors: | Jaroslav Stejskal Miroslava Trchová Elena N Konyushenko Jan Prokeš |
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Affiliation: | a Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic b IPREM-EPCP, UM 5254, 64053 Pau Cedex 9, France c Charles University Prague, Faculty of Mathematics and Physics, 182 00 Prague 8, Czech Republic |
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Abstract: | Polyaniline (PANI) (emeraldine) base has been exposed to iodine in an ethanol-water suspension. The conductivity of PANI increased from 10−9 S cm−1 to 10−4 S cm−1 already at the molar ratio I2]/PANI] = 1, and a higher content of iodine had only a marginal effect. This is the result of the protonation of PANI base with hydriodic acid, which is a by-product of the oxidation of the emeraldine form of PANI to pernigraniline constitutional units. The reaction is discussed on the basis of FTIR spectra. An alternative reaction, a ring-iodination of PANI, is marginal. Only one iodine atom substitutes a hydrogen atom in about 12 aniline units, even at high iodine concentration, I2]/PANI] = 8. The film of polyaniline base can be used in sensing iodine; after exposure to the iodine vapor, the conductivity of the polyaniline film increased. |
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Keywords: | Conducting polymer Polyaniline Iodine |
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