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Title: Competition between Singlet Fission and Spin‐Orbit‐Induced Intersystem Crossing in Anthanthrene and Anthanthrone Derivatives

Abstract

Abstract Singlet and triplet excited‐state dynamics of anthanthrene and anthanthrone derivatives in solution are studied. Triisopropylsilyl‐ (TIPS) or H‐terminated ethynyl groups are used to tune the singlet and triplet energies to enable their potential applications in singlet fission and triplet fusion processes. Time‐resolved optical and electron paramagnetic resonance (EPR) spectroscopies are used to obtain a mechanistic understanding of triplet formation. The anthanthrene derivatives form triplet states efficiently at a rate (ca. 10 7  s −1 ) comparable to radiative singlet fluorescence processes with approximately 30 % triplet yields, despite their large S 1 ‐T 1 energy gap (>1 eV) and the lack of carbonyl groups. In contrast, anthanthrone has a higher triplet yield (50±10 %) with a faster intersystem crossing rate (2.7 10 8  s −1 ) because of the n‐π* character of the S 1 ←S 0 transition. Analysis of time‐resolved spin‐polarized EPR spectra of these compounds reveals that the triplet states are primarily generated by the spin‐orbit‐induced intersystem crossing mechanism. However, at high concentrations, the EPR spectrum of the 4,6,10,14‐tetrakis(TIPS‐ethynyl)anthanthrene triplet state shows a significant contribution from a non‐Boltzmann population of the m s =0 spin sublevel, which is characteristic of triplet formation by singlet fission.

Authors:
 [1];  [1];  [2];  [3];  [3];  [4]; ORCiD logo [1]
  1. Department of Chemistry and Institute for Sustainability and Energy at Northwestern Northwestern University Evanston IL 60208-3113 USA
  2. Department of Chemistry and Biochemistry and Centre for NanoScience Research Concordia University Montréal Québec H4B 1R6 Canada
  3. Department of Chemistry Université Laval Québec Québec G1 V 0 A6 Canada
  4. Department of Chemistry and Institute for Sustainability and Energy at Northwestern Northwestern University Evanston IL 60208-3113 USA, School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT United Kingdom
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1561361
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
ChemPlusChem
Additional Journal Information:
Journal Name: ChemPlusChem Journal Volume: 84 Journal Issue: 9; Journal ID: ISSN 2192-6506
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Jue Bae, Youn, Krzyaniak, Matthew D., Majewski, Marek B., Desroches, Maude, Morin, Jean‐François, Wu, Yi‐Lin, and Wasielewski, Michael R. Competition between Singlet Fission and Spin‐Orbit‐Induced Intersystem Crossing in Anthanthrene and Anthanthrone Derivatives. Germany: N. p., 2019. Web. doi:10.1002/cplu.201900410.
Jue Bae, Youn, Krzyaniak, Matthew D., Majewski, Marek B., Desroches, Maude, Morin, Jean‐François, Wu, Yi‐Lin, & Wasielewski, Michael R. Competition between Singlet Fission and Spin‐Orbit‐Induced Intersystem Crossing in Anthanthrene and Anthanthrone Derivatives. Germany. https://doi.org/10.1002/cplu.201900410
Jue Bae, Youn, Krzyaniak, Matthew D., Majewski, Marek B., Desroches, Maude, Morin, Jean‐François, Wu, Yi‐Lin, and Wasielewski, Michael R. Wed . "Competition between Singlet Fission and Spin‐Orbit‐Induced Intersystem Crossing in Anthanthrene and Anthanthrone Derivatives". Germany. https://doi.org/10.1002/cplu.201900410.
@article{osti_1561361,
title = {Competition between Singlet Fission and Spin‐Orbit‐Induced Intersystem Crossing in Anthanthrene and Anthanthrone Derivatives},
author = {Jue Bae, Youn and Krzyaniak, Matthew D. and Majewski, Marek B. and Desroches, Maude and Morin, Jean‐François and Wu, Yi‐Lin and Wasielewski, Michael R.},
abstractNote = {Abstract Singlet and triplet excited‐state dynamics of anthanthrene and anthanthrone derivatives in solution are studied. Triisopropylsilyl‐ (TIPS) or H‐terminated ethynyl groups are used to tune the singlet and triplet energies to enable their potential applications in singlet fission and triplet fusion processes. Time‐resolved optical and electron paramagnetic resonance (EPR) spectroscopies are used to obtain a mechanistic understanding of triplet formation. The anthanthrene derivatives form triplet states efficiently at a rate (ca. 10 7  s −1 ) comparable to radiative singlet fluorescence processes with approximately 30 % triplet yields, despite their large S 1 ‐T 1 energy gap (>1 eV) and the lack of carbonyl groups. In contrast, anthanthrone has a higher triplet yield (50±10 %) with a faster intersystem crossing rate (2.7 10 8  s −1 ) because of the n‐π* character of the S 1 ←S 0 transition. Analysis of time‐resolved spin‐polarized EPR spectra of these compounds reveals that the triplet states are primarily generated by the spin‐orbit‐induced intersystem crossing mechanism. However, at high concentrations, the EPR spectrum of the 4,6,10,14‐tetrakis(TIPS‐ethynyl)anthanthrene triplet state shows a significant contribution from a non‐Boltzmann population of the m s =0 spin sublevel, which is characteristic of triplet formation by singlet fission.},
doi = {10.1002/cplu.201900410},
journal = {ChemPlusChem},
number = 9,
volume = 84,
place = {Germany},
year = {Wed Aug 21 00:00:00 EDT 2019},
month = {Wed Aug 21 00:00:00 EDT 2019}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1002/cplu.201900410

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