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Title: Aromaticity of giant polycyclic aromatic hydrocarbons with hollow sites: Super ring currents in super-rings.
Authors: HAJGATO, Balazs 
DELEUZE, Michael 
Ohno, K.
Issue Date: 2006
Publisher: Wiley
Source: CHEMISTRY-A EUROPEAN JOURNAL, 12(22). p. 5757-5769
Abstract: We present a systematic theoretical study based on semi-empirical, Hartree–Fock (HF), and density functional theory (DFT) models of a series of polycyclic aromatic hydrocarbons (PAHs) that exhibit hollow sites. In this study we focus particularly on the magnetic criteria of aromaticity, namely 1H NMR and nucleus-independent chemical shifts (NICS), and on their relationships with other electronic properties. The computed shifts and NICS indices indicate that an external magnetic field induces exceptionally strong ring currents in even-layered PAH doughnuts, in particular in the layer directly adjacent to the central hole of double-layered compounds. These exceptionally strong ring currents also correlate with particularly small HOMO–LUMO gaps and electronic excitation energies and to abnormally high polarizabilities, indicating in turn that these compounds have a more pronounced metallic character. Comparison is made with further depictions of aromaticity in these systems and in [18]–[66]annulene rings by employing topological, structural, and energetic criteria.
Keywords: ab initio calculations, aromaticity · polarizabilities · polycyclic aromatic hydrocarbons · ring currents
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ISSN: 0947-6539
e-ISSN: 1521-3765
DOI: 10.1002/chem.200501321
ISI #: 000239481600009
Category: A1
Type: Journal Contribution
Validations: ecoom 2007
Appears in Collections:Research publications

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