Journal of Molecular Modeling

, Volume 9, Issue 5, pp 342–347 | Cite as

Local molecular properties and their use in predicting reactivity

  • Bernd Ehresmann
  • Bodo Martin
  • Anselm H. C. Horn
  • Timothy Clark
Original Paper


Expressions for the local electron affinity, electronegativity and hardness are derived in analogy to the local ionization energy introduced by Sjoberg, Murray and Politzer. The local polarizability is also defined based on an additive atomic orbital polarizability model that uses Rivail's variational technique. The characteristics of these local properties at molecular surfaces and their relevance to electrophilic aromatic substitution, to SN2 reactivity and to the nucleophilicity of enolate ions are discussed.

Figure The local ionization energy at the SES surfaces of methyl benzoate. The color scale ranges from 375 (blue) to 550 kcal mol−1 (red). The blue areas are those for which interaction with an acceptor is most favorable.


Surface properties AM1 Local ionization energy Local electron affinity Local hardness 



We especially thank Peter Politzer for stimulating discussions. We thank Pfizer Ltd and the Fonds der Chemischen Industrie for financial support.


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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Bernd Ehresmann
    • 1
  • Bodo Martin
    • 1
  • Anselm H. C. Horn
    • 1
  • Timothy Clark
    • 1
  1. 1.Computer-Chemie-Centrum der Universität Erlangen-NürnbergNägelsbachstrasse 25ErlangenGermany

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