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A crystalline radical cation derived from Thiele’s hydrocarbon with redox range beyond 1 V

Thiele’s hydrocarbon occupies a central role as an open-shell platform for new organic materials, however little is known about its redox behaviour. While recent synthetic approaches involving symmetrical carbene substitution of the CPh(2) termini yield isolable neutral/dicationic analogues, the int...

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Autores principales: Loh, Ying Kai, Vasko, Petra, McManus, Caitilín, Heilmann, Andreas, Myers, William K., Aldridge, Simon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8642399/
https://www.ncbi.nlm.nih.gov/pubmed/34862371
http://dx.doi.org/10.1038/s41467-021-27104-y
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author Loh, Ying Kai
Vasko, Petra
McManus, Caitilín
Heilmann, Andreas
Myers, William K.
Aldridge, Simon
author_facet Loh, Ying Kai
Vasko, Petra
McManus, Caitilín
Heilmann, Andreas
Myers, William K.
Aldridge, Simon
author_sort Loh, Ying Kai
collection PubMed
description Thiele’s hydrocarbon occupies a central role as an open-shell platform for new organic materials, however little is known about its redox behaviour. While recent synthetic approaches involving symmetrical carbene substitution of the CPh(2) termini yield isolable neutral/dicationic analogues, the intervening radical cations are much more difficult to isolate, due to narrow compatible redox ranges (typically < 0.25 V). Here we show that a hybrid BN/carbene approach allows access to an unsymmetrical analogue of Thiele’s hydrocarbon 1, and that this strategy confers markedly enhanced stability on the radical cation. 1(•+) is stable across an exceptionally wide redox range (> 1 V), permitting its isolation in crystalline form. Further single-electron oxidation affords borenium dication 1(2+), thereby establishing an organoboron redox system fully characterized in all three redox states. We perceive that this strategy can be extended to other transient organic radicals to widen their redox stability window and facilitate their isolation.
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spelling pubmed-86423992021-12-15 A crystalline radical cation derived from Thiele’s hydrocarbon with redox range beyond 1 V Loh, Ying Kai Vasko, Petra McManus, Caitilín Heilmann, Andreas Myers, William K. Aldridge, Simon Nat Commun Article Thiele’s hydrocarbon occupies a central role as an open-shell platform for new organic materials, however little is known about its redox behaviour. While recent synthetic approaches involving symmetrical carbene substitution of the CPh(2) termini yield isolable neutral/dicationic analogues, the intervening radical cations are much more difficult to isolate, due to narrow compatible redox ranges (typically < 0.25 V). Here we show that a hybrid BN/carbene approach allows access to an unsymmetrical analogue of Thiele’s hydrocarbon 1, and that this strategy confers markedly enhanced stability on the radical cation. 1(•+) is stable across an exceptionally wide redox range (> 1 V), permitting its isolation in crystalline form. Further single-electron oxidation affords borenium dication 1(2+), thereby establishing an organoboron redox system fully characterized in all three redox states. We perceive that this strategy can be extended to other transient organic radicals to widen their redox stability window and facilitate their isolation. Nature Publishing Group UK 2021-12-03 /pmc/articles/PMC8642399/ /pubmed/34862371 http://dx.doi.org/10.1038/s41467-021-27104-y Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Loh, Ying Kai
Vasko, Petra
McManus, Caitilín
Heilmann, Andreas
Myers, William K.
Aldridge, Simon
A crystalline radical cation derived from Thiele’s hydrocarbon with redox range beyond 1 V
title A crystalline radical cation derived from Thiele’s hydrocarbon with redox range beyond 1 V
title_full A crystalline radical cation derived from Thiele’s hydrocarbon with redox range beyond 1 V
title_fullStr A crystalline radical cation derived from Thiele’s hydrocarbon with redox range beyond 1 V
title_full_unstemmed A crystalline radical cation derived from Thiele’s hydrocarbon with redox range beyond 1 V
title_short A crystalline radical cation derived from Thiele’s hydrocarbon with redox range beyond 1 V
title_sort crystalline radical cation derived from thiele’s hydrocarbon with redox range beyond 1 v
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8642399/
https://www.ncbi.nlm.nih.gov/pubmed/34862371
http://dx.doi.org/10.1038/s41467-021-27104-y
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