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Singlet fission in linear chains of molecules
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Ambrosio, Francesco and Troisi, Alessandro (2014) Singlet fission in linear chains of molecules. The Journal of Chemical Physics, 141 (20). 204703. doi:10.1063/1.4902135 ISSN 0021-9606.
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Official URL: http://dx.doi.org/10.1063/1.4902135
Abstract
We develop a model configuration interaction Hamiltonian to study the electronic structure of a chain of molecules undergoing singlet fission. We first consider models for dimer and trimer and then we use a matrix partitioning technique to build models of arbitrary size able to describe the relevant electronic structure for singlet fission in linear aggregates. We find that the multi-excitonic state (ME) is stabilized at short inter-monomer distance and the extent of this stabilization depends upon the size of orbital coupling between neighboring monomers. We also find that the coupling between ME states located on different molecules is extremely small leading to bandwidths in the order of ∼10 meV. This observation suggests that multi-exciton states are extremely localized by electron-phonon coupling and that singlet fission involves the transition between a relatively delocalized Frenkel exciton and a strongly localized multi-exciton state. We adopt the methodology commonly used to study non-radiative transitions to describe the singlet fission dynamics in these aggregates and we discuss the limit of validity of the approach. The results indicate that the phenomenology of singlet fission in molecular crystals is different in many important ways from what is observed in isolated dimers.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||
| Library of Congress Subject Headings (LCSH): | Dimers, Molecular crystals, Monomers | ||||||||
| Journal or Publication Title: | The Journal of Chemical Physics | ||||||||
| Publisher: | American Institute of Physics | ||||||||
| ISSN: | 0021-9606 | ||||||||
| Official Date: | 25 November 2014 | ||||||||
| Dates: |
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| Volume: | 141 | ||||||||
| Number: | 20 | ||||||||
| Article Number: | 204703 | ||||||||
| DOI: | 10.1063/1.4902135 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 15 November 2016 | ||||||||
| Date of first compliant Open Access: | 15 November 2016 | ||||||||
| Funder: | European Research Council (ERC) |
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