We analyze the dynamics of intramolecular singlet fission in a series of pentacene-based dimers consisting of two pentacene-like chromophores covalently bonded to a phenylene linker in ortho, meta, and para positions. The study uses a quantum dynamical approach that employs a model vibronic Hamiltonian whose parameters are obtained using multireference perturbation theory methods. The results highlight the different role of the direct and mediated mechanism in these systems, showing that the population of the multiexcitonic state, corresponding to the first step of the intramolecular singlet fission process, occurs mainly through a superexchange-like mechanism involving doubly excited or charge transfer states that participate in the process in a virtual way. In addition, the systems investigated provide insight into the roles that built-in geometrical constraints and the electronic structure of the spacer play in the intramolecular singlet fission process.
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28 July 2019
Research Article|
July 30 2019
Quantum dynamical simulation of intramolecular singlet fission in covalently coupled pentacene dimers
Special Collection:
Singlet Fission
S. Rajagopala Reddy
;
S. Rajagopala Reddy
1
Institute of Physics, Albert-Ludwigs University Freiburg
, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
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Pedro B. Coto
;
Pedro B. Coto
a)
2
Department of Physical and Analytical Chemistry, University of Oviedo
, Avda. Julián Clavería 8, 33006, Oviedo, Spain
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Michael Thoss
Michael Thoss
b)
1
Institute of Physics, Albert-Ludwigs University Freiburg
, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
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S. Rajagopala Reddy
1
Pedro B. Coto
2,a)
Michael Thoss
1,b)
1
Institute of Physics, Albert-Ludwigs University Freiburg
, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
2
Department of Physical and Analytical Chemistry, University of Oviedo
, Avda. Julián Clavería 8, 33006, Oviedo, Spain
a)
Electronic mail: [email protected]
b)
Electronic mail: [email protected]
Note: This paper is part of the JCP special collection on Singlet Fission.
J. Chem. Phys. 151, 044307 (2019)
Article history
Received:
May 13 2019
Accepted:
July 09 2019
Citation
S. Rajagopala Reddy, Pedro B. Coto, Michael Thoss; Quantum dynamical simulation of intramolecular singlet fission in covalently coupled pentacene dimers. J. Chem. Phys. 28 July 2019; 151 (4): 044307. https://doi.org/10.1063/1.5109897
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