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Issue 19, 2018
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Aromaticity of acenes: the model of migrating π-circuits

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Abstract

In this work we extend the concept of migrating Clar's sextets to explain local aromaticity trends in linear acenes predicted by theoretical calculations and experimental data. To assess the link between resonance and reactivity and to rationalize the constant-height AFM image of pentacene we used the electron density of delocalized bonds and other functions of the one-electron density from conceptual density functional theory. The presented results provide evidence for migration of Clar's π-sextets and larger circuits in these systems, and clearly show that the link between the theoretical concept of aromaticity and the real electronic structure entails the separation of intra- and inter-ring resonance effects, which in the case of [n]acenes (n = 3, 4, 5) comes down to solving a system of simple linear equations.

Graphical abstract: Aromaticity of acenes: the model of migrating π-circuits

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Article information


Submitted
16 Feb 2018
Accepted
25 Apr 2018
First published
27 Apr 2018

Phys. Chem. Chem. Phys., 2018,20, 13430-13436
Article type
Paper

Aromaticity of acenes: the model of migrating π-circuits

D. W. Szczepanik, M. Solà, T. M. Krygowski, H. Szatylowicz, M. Andrzejak, B. Pawełek, J. Dominikowska, M. Kukułka and K. Dyduch, Phys. Chem. Chem. Phys., 2018, 20, 13430
DOI: 10.1039/C8CP01108G

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