Triplet Formation in a 9,10-Bis(phenylethynyl)anthracene Dimer and Trimer Occurs by Charge Recombination Rather than Singlet Fission
(2023) In Journal of Physical Chemistry Letters 14(35). p.7897-7902- Abstract
We present an experimental study investigating the solvent-dependent dynamics of a 9,10-bis(phenylethynyl)anthracene monomer, dimer, and trimer. Using transient absorption spectroscopy, we have discovered that triplet excited state formation in the dimer and trimer molecules in polar solvents is a consequence of charge recombination subsequent to symmetry-breaking charge separation rather than singlet fission. Total internal reflection emission measurements of the monomer demonstrate that excimer formation serves as the primary decay pathway at a high concentration. In the case of highly concentrated solutions of the trimer, we observe evidence of triplet formation without the prior formation of a charge-separated state. We postulate... (More)
We present an experimental study investigating the solvent-dependent dynamics of a 9,10-bis(phenylethynyl)anthracene monomer, dimer, and trimer. Using transient absorption spectroscopy, we have discovered that triplet excited state formation in the dimer and trimer molecules in polar solvents is a consequence of charge recombination subsequent to symmetry-breaking charge separation rather than singlet fission. Total internal reflection emission measurements of the monomer demonstrate that excimer formation serves as the primary decay pathway at a high concentration. In the case of highly concentrated solutions of the trimer, we observe evidence of triplet formation without the prior formation of a charge-separated state. We postulate that this is attributed to the formation of small aggregates, suggesting that oligomers mimicking the larger chromophore counts in crystals could potentially facilitate singlet fission. Our experimental study sheds light on the intricate dynamics of the 9,10-bis(phenylethynyl)anthracene system, elucidating the role of solvent- and concentration-dependent factors for triplet formation and charge separation.
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- author
- Ringström, Rasmus ; Schroeder, Zachary W. ; Mencaroni, Letizia ; Chabera, Pavel LU ; Tykwinski, Rik R. and Albinsson, Bo
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physical Chemistry Letters
- volume
- 14
- issue
- 35
- pages
- 6 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:37642563
- scopus:85170110799
- ISSN
- 1948-7185
- DOI
- 10.1021/acs.jpclett.3c02050
- language
- English
- LU publication?
- yes
- id
- 0ec4e346-cce5-429a-bce0-2fe07a94e133
- date added to LUP
- 2023-10-09 17:08:38
- date last changed
- 2024-04-19 02:11:32
@article{0ec4e346-cce5-429a-bce0-2fe07a94e133,
abstract = {{<p>We present an experimental study investigating the solvent-dependent dynamics of a 9,10-bis(phenylethynyl)anthracene monomer, dimer, and trimer. Using transient absorption spectroscopy, we have discovered that triplet excited state formation in the dimer and trimer molecules in polar solvents is a consequence of charge recombination subsequent to symmetry-breaking charge separation rather than singlet fission. Total internal reflection emission measurements of the monomer demonstrate that excimer formation serves as the primary decay pathway at a high concentration. In the case of highly concentrated solutions of the trimer, we observe evidence of triplet formation without the prior formation of a charge-separated state. We postulate that this is attributed to the formation of small aggregates, suggesting that oligomers mimicking the larger chromophore counts in crystals could potentially facilitate singlet fission. Our experimental study sheds light on the intricate dynamics of the 9,10-bis(phenylethynyl)anthracene system, elucidating the role of solvent- and concentration-dependent factors for triplet formation and charge separation.</p>}},
author = {{Ringström, Rasmus and Schroeder, Zachary W. and Mencaroni, Letizia and Chabera, Pavel and Tykwinski, Rik R. and Albinsson, Bo}},
issn = {{1948-7185}},
language = {{eng}},
number = {{35}},
pages = {{7897--7902}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Journal of Physical Chemistry Letters}},
title = {{Triplet Formation in a 9,10-Bis(phenylethynyl)anthracene Dimer and Trimer Occurs by Charge Recombination Rather than Singlet Fission}},
url = {{http://dx.doi.org/10.1021/acs.jpclett.3c02050}},
doi = {{10.1021/acs.jpclett.3c02050}},
volume = {{14}},
year = {{2023}},
}