Vibrational Spectra and Structure of Polyaniline

Y. Furukawa, F. Ueda, Y. Hyodo*, I. Harada, T. Nakajima, T. Kawagoe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

640 Citations (Scopus)


Vibrational spectra have been studied on polyaniline in various forms with different electrical properties: two conducting forms, as-polymerized (2S) and doped 1A polyanilines; and three insulating forms, reduced-alkali-treated (1A), acid-treated 1A (IS), and oxygen-treated 1A [1A(O2)] polyanilines. Polyaniline 1A is spectroscopically evidenced to be poly(imino-l,4-phenylene), -(NHC6H4)n-. Polyaniline 1S consists of imino-l,4-phenylene (IP) unit (-NHC6H4-) and its salt unit (-NH2 +A--C6H4-, (A-, anion)). Treatment of 1A with oxygen converts part of consecutive IP units (-NHC6H4NHC6H4-) to nitrilo-2,5-cyclo-hexadiene-l,4-diylidenenitrilo-l,4-phenylene (NP) unit (-N=C6H4=NC6H4-). Semiquinone radical cations of IP units exist only in the conducting forms of polyaniline, 2S and doped 1A, indicating that semiquinone radical cations play an important role in electrical conduction in polyaniline.

Original languageEnglish
Pages (from-to)1297-1305
Number of pages9
Issue number5
Publication statusPublished - 1988 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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