Theoretica chimica acta

, Volume 70, Issue 1, pp 25–34 | Cite as

Aromaticity of annulenes and annulene ions with 4v+2 electrons from the viewpoint of the theory of Hartree-Fock instabilities

  • Peter Karadakov
  • Obis Casta¯no


The connection between the aromaticity of annulenes and annulene ions with 4v+2 π-electrons and the stability of the closed-shell restricted Hartree-Fock (RHF) solutions for these systems is discussed in the framework of the PPP-approximation. It is shown that the tendency towards an uniform electron density distribution in aromatic cycles is paralleled by the stability properties of the corresponding closed-shell RHF solutions. The stability investigations are demonstrated to provide realistic estimates of the critical ring sizes at which Hückel's 4v+2 rule breaks down.

Key words

Aromaticity Annulenes Hartree-Fock instabilities 


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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • Peter Karadakov
    • 1
  • Obis Casta¯no
    • 2
  1. 1.Faculty of Chemistry of the Sofia State UniversitySofiaBulgaria
  2. 2.Institute of Organic ChemistryBulgarian Academy of SciencesSofiaBulgaria

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