Electronic structures of [n]-cyclacenes (n = 6-12) and short, hydrogen-capped, carbon nanotubes

Daniel Sadowsky, Kristopher McNeill, Christopher J. Cramer

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Density functional (M06-L and B3LYP) and multiconfigurational second-order perturbation (CASPT2) theories are applied to [n]-cyclacenes having n = 6-12 in order to assess their strain energies and the degree of di- or polyradical character inherent in their electronic structures. In the case of density functional theory, a broken symmetry approach must be employed and the sensitivity of the results to choice of functional and broken-symmetry protocol is explored. Viewing the [n]-cyclacenes as monomeric building blocks which may be joined to grow finite length (n,0) single-walled carbon nanotubes, density functional calculations are further employed to explore changes in electronic structure associated with increasing nanotube length. Spin-state energy gaps are predicted to decrease both with increasing cyclacene size and with increasing nanotube length; [n]-cyclacenes with odd values of n are predicted to develop polyradical character for smaller n than is the case for even values n.

Original languageEnglish (US)
Pages (from-to)507-521
Number of pages15
JournalFaraday Discussions
StatePublished - 2010

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Copyright 2010 Elsevier B.V., All rights reserved.


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