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On the triplet nature of paramagnetic centers in conducting polymers

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Abstract

Temperature dependences of the magnetic susceptibility of solutions and powders of polyaniline synthesized by oxidative polymerization using two methods were measured by ESR in the temperature range from 123 to 423 K. The dependences observed can be described by the integral of susceptibility of the polymer fragments in the triplet state over the singlet—triplet splitting from E 1 to E 2 with constant weight. The susceptibility of the fragments was accepted to obey the Bleaney—Bowers equation. The most part of the experimental dependences can be presented as the sum of the temperature-independent susceptibility and the susceptibility obeying the Curie law. The both susceptibilities are described in a single manner at E 1 < 0. In some cases, the comparison of the calculated and experimental dependences makes it possible to determine the length of the fragments L. The conditions of polymer synthesis, heating, and water vapors affect the E 1 and E 2 values. A similar analysis can be applied to other conducting polymers.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 prosp. Akad. Semenova, 142432, Chernogolovka, Moscow Region, Russian Federation

    A. V. Kulikov, A. S. Komissarova, M. N. Shishlov & L. S. Fokeeva

Authors
  1. A. V. Kulikov
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  2. A. S. Komissarova
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  3. M. N. Shishlov
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  4. L. S. Fokeeva
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Corresponding author

Correspondence to A. V. Kulikov.

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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 316–321, February, 2008.

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Kulikov, A.V., Komissarova, A.S., Shishlov, M.N. et al. On the triplet nature of paramagnetic centers in conducting polymers. Russ Chem Bull 57, 324–329 (2008). https://doi.org/10.1007/s11172-008-0050-7

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  • DOI: https://doi.org/10.1007/s11172-008-0050-7

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