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Related Experiment Videos

To what extent can aromaticity be defined uniquely?

Michal K Cyrañski1, Tadeusz M Krygowski, Alan R Katritzky

  • 1Department of Chemistry, University of Warsaw, Pasteura 1, 02 093 Warsaw, Poland. chamis@chem.uw.edu.pl

The Journal of Organic Chemistry
|February 16, 2002
PubMed
Summary

Statistical analysis reveals aromaticity is generally one-dimensional across diverse systems. However, specific compound groups show varied correlations, indicating aromaticity can be multidimensional in practice.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Organic Chemistry

Background:

  • Aromaticity is a fundamental concept in chemistry, crucial for understanding molecular stability and reactivity.
  • Numerous quantitative criteria exist to define and measure aromaticity, including energetic, geometric, and magnetic descriptors.
  • Understanding the interrelationships between these criteria is essential for a comprehensive view of aromaticity.

Purpose of the Study:

  • To statistically analyze correlations among various quantitative aromaticity criteria.
  • To determine if aromaticity can be considered a one-dimensional or multidimensional phenomenon.
  • To investigate how correlations change when analyzing specific subsets of chemical compounds.

Main Methods:

  • Statistical analysis of 75 five-membered pi-electron systems (heterocyclic derivatives) and 30 ring-monosubstituted compounds.

Related Experiment Videos

  • Evaluation of multiple aromaticity indices: aromatic stabilization energies (ASE), resonance energies (RE), magnetic susceptibility exaltation (Lambda), NICS, HOMA, I5, and A(J).
  • Comparative analysis of correlations across the entire dataset and within specific compound subgroups.

    • Main Results:

    • Statistically significant correlations were found among aromaticity criteria when considering the entire set of compounds, suggesting a one-dimensional nature.
    • Correlations deteriorated or vanished when analyzing restricted subsets, such as aromatic compounds with high ASE or polyheterocyclic systems.
    • Energetic, geometric, and magnetic descriptors of aromaticity do not always align, particularly in specific chemical contexts.

    Conclusions:

    • Broadly, aromaticity exhibits related manifestations and can be statistically viewed as a one-dimensional phenomenon.
    • In practical applications and for specific compound classes, aromaticity behaves as a multidimensional phenomenon due to varying descriptor correlations.
    • The choice of compound set significantly impacts the observed dimensionality of aromaticity.