The delocalization index as an electronic aromaticity criterion: application to a series of planar polycyclic aromatic hydrocarbons |
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Authors: | Poater Jordi Fradera Xavier Duran Miquel Solà Miquel |
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Affiliation: | Institut de Química Computacional, Departament de Química Universitat de Girona 17071 Girona, Catalonia, Spain. |
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Abstract: | This work introduces a new local aromaticity measure, defined as the mean of Bader's electron delocalization index (DI) of para-related carbon atoms in six-membered rings. This new electronic criterion of aromaticity is based on the fact that aromaticity is related to the cyclic delocalized distribution of pi-electrons. We have found that this DI and the harmonic oscillator model of aromaticity (HOMA) index are strongly correlated for a series of six-membered rings in eleven planar polycyclic aromatic hydrocarbons. The correlation between the DI and the nucleus-independent chemical shift (NICS) values is less remarkable, although in general six-membered rings with larger DI values also have more negative NICS indices. We have shown that this index can also be applied, with some modifications, to study of the aromaticity in five-membered rings. |
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Keywords: | aromaticity atoms in molecules theory (AIM) para‐delocalization index (PDI) planar polycyclic aromatic hydrocarbons (PAH) |
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