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DFT simulation of the heteroannelated octatetraenes vibronic spectra with the Franck-Condon and Herzberg-Teller approaches including Duschinsky effect
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology. Tomsk State Univ.
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2015 (English)In: Chemical Physics, ISSN 0301-0104, E-ISSN 1873-4421, Vol. 459, 65-71 p.Article in journal (Refereed) Published
Abstract [en]

Calculations of vibronic structure in the electronic absorption spectra are carried out for the series of heteroannelated octatetraenes on the basis of density functional theory method. Both Franck-Condon and Herzberg-Teller approaches have been used for estimation of frequency and intensity of vibronic bands in the simulated absorption spectra with respect to the S-0 -> S-1 electronic transition. The key result discussed in this work is that the electronic transition into the first singlet excited states is vibronicallyactive in the absorption spectra for all studied circulenes in a good agreement with experimental observations. We have confirmed our previous assumption that the first (low-lying) weak absorption maximum in the spectra of tetra-tert-butyltetraoxa[8] circulene and dithieno[3,4-b: 3',4'-d]thiophene-annelated cyclooctatetraene can be assigned just for the S-0 -> S-1 transition which produce the next more intense vibronic satellite. In the case of aza[8] circulenes the S-0 -> S-1 transition is symmetry allowed and the corresponding vibronic bands are less intense relative to 0-0 band. (C) 2015 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 459, 65-71 p.
Keyword [en]
Circulene, Vibronic effects, Heteroannelated octatetraenes, Franck-Condon factor, Herzberg-Teller approximation, Shpolsky spectra
National Category
Theoretical Chemistry Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-174919DOI: 10.1016/j.chemphys.2015.08.003ISI: 000361453500010Scopus ID: 2-s2.0-84939811410OAI: oai:DiVA.org:kth-174919DiVA: diva2:865407
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QC 20151028

Available from: 2015-10-28 Created: 2015-10-09 Last updated: 2017-12-01Bibliographically approved

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Ågren, Hans

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