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Multiphilic descriptor for chemical reactivity and selectivity.

J Padmanabhan1, R Parthasarathi, M Elango

  • 1Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India.

The Journal of Physical Chemistry. A
|August 25, 2007
PubMed
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We introduce a multiphilic descriptor to explain atomic site nucleophilicity and electrophilicity simultaneously. This new descriptor shows predictive ability in chemical reactions and reactivity studies.

Area of Science:

  • Quantum Chemistry
  • Chemical Reactivity Theory

Background:

  • The local philicity concept and dual descriptor are established methods for analyzing chemical reactivity.
  • Understanding nucleophilicity and electrophilicity at atomic sites is crucial for predicting reaction pathways.

Purpose of the Study:

  • To propose a novel multiphilic descriptor that integrates nucleophilic and electrophilic properties.
  • To analyze the variation of these properties along reaction paths.
  • To evaluate the descriptor's predictive power for chemical reactions and intra/intermolecular reactivities.

Main Methods:

  • Definition of the multiphilic descriptor as the difference between nucleophilic (ω(k)+) and electrophilic (ω(k)-) condensed philicity functions.
  • Analysis of descriptor variations along soft reaction paths.

Related Experiment Videos

  • Testing the descriptor's predictive ability on selected systems and reactions.
  • Definition and testing of the nucleophilicity excess descriptor (Δω(g)-/+) for intra- and intermolecular reactivities.

    • Main Results:

    • The multiphilic descriptor successfully explains simultaneous nucleophilicity and electrophilicity of atomic sites.
    • Descriptor variations correlate with reaction path dynamics.
    • The descriptor demonstrates predictive accuracy in tested chemical systems.
    • The nucleophilicity excess descriptor is effective for analyzing all-metal aromatic compounds.

    Conclusions:

    • The proposed multiphilic descriptor offers a unified approach to understanding atomic site reactivity.
    • This descriptor enhances the prediction of chemical reaction outcomes.
    • The nucleophilicity excess descriptor provides insights into complex reactivity patterns in novel chemical structures.