Structural Chemistry

, Volume 8, Issue 2, pp 121–129 | Cite as

Theoretical analysis of counterfoil influence over the physicochemical properties of aniline tetramers in several oxidation states

  • M. E. Vaschetto
  • B. A. Retamal
  • M. L. Contreras
  • J. H. Zagal


We present semiempirical quantum chemical calculations of geometric structures, charge distributions, energy levels, ionization potentials, and enthalpies of formation for aniline tetramers in different oxidation states using the semiempirical AM1 method. For tetraaniline radical cation the effect of these three counterions on the above-mentioned physicochemical parameters was analyzed. The ions studied included Cl, HSQ4, and CH3COO. Chloride counterion showed a large charge transfer to the chain, as was shown in a preceding work [4]. HSO4 showed a strong charge stabilization without transfer. CH3COO exhibits hydrogen bond formation and also displays a strong charge stabilization in a fragment of the chain, but does not transfer any charge. Also, Cl was able to form a hydrogen bond, depending on the initial position that it occupies in relation to the tetrameric chain, which is then optimized. Charge transfer is present for the Cl cases. For dication structures the effect of SO 4 2− was analyzed. Our calculations showed that the distribution of the energy levels of tetraaniline radical cation can be comparable to the polyaniline ones by adding a counterion to the tetramer.

Key words

Oligoaniline polyaniline anions charge transfer 


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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • M. E. Vaschetto
    • 1
  • B. A. Retamal
    • 1
  • M. L. Contreras
    • 1
  • J. H. Zagal
    • 1
  1. 1.Facultad de Química y BiologíaUniversidad de Santiago de ChileSantiagoChile

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