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Cooperative Switching in Nanofibers of Azobenzene Oligomers
Next-generation molecular devices and machines demand the integration of molecular switches into hierarchical assemblies to amplify the response of the system from the molecular level to the meso- or macro-scale. Here, we demonstrate that multi-azobenzene oligomers can assemble to form robust supram...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4861954/ https://www.ncbi.nlm.nih.gov/pubmed/27161608 http://dx.doi.org/10.1038/srep25605 |
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author | Weber, Christopher Liebig, Tobias Gensler, Manuel Zykov, Anton Pithan, Linus Rabe, Jürgen P. Hecht, Stefan Bléger, David Kowarik, Stefan |
author_facet | Weber, Christopher Liebig, Tobias Gensler, Manuel Zykov, Anton Pithan, Linus Rabe, Jürgen P. Hecht, Stefan Bléger, David Kowarik, Stefan |
author_sort | Weber, Christopher |
collection | PubMed |
description | Next-generation molecular devices and machines demand the integration of molecular switches into hierarchical assemblies to amplify the response of the system from the molecular level to the meso- or macro-scale. Here, we demonstrate that multi-azobenzene oligomers can assemble to form robust supramolecular nanofibers in which they can be switched repeatedly between the E- and Z-configuration. While in isolated oligomers the azobenzene units undergo reversible photoisomerization independently, in the nanofibers they are coupled via intermolecular interactions and switch cooperatively as evidenced by unusual thermal and kinetic behavior. We find that the photoisomerization rate from the Z-isomer to the E-isomer depends on the fraction of Z-azobenzene in the nanofibers, and is increased by more than a factor of 4 in Z-rich fibers when compared to E-rich fibers. This demonstrates the great potential of coupling individual photochromic units for increasing their quantum efficiency in the solid state with potential relevance for actuation and sensing. |
format | Online Article Text |
id | pubmed-4861954 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-48619542016-05-23 Cooperative Switching in Nanofibers of Azobenzene Oligomers Weber, Christopher Liebig, Tobias Gensler, Manuel Zykov, Anton Pithan, Linus Rabe, Jürgen P. Hecht, Stefan Bléger, David Kowarik, Stefan Sci Rep Article Next-generation molecular devices and machines demand the integration of molecular switches into hierarchical assemblies to amplify the response of the system from the molecular level to the meso- or macro-scale. Here, we demonstrate that multi-azobenzene oligomers can assemble to form robust supramolecular nanofibers in which they can be switched repeatedly between the E- and Z-configuration. While in isolated oligomers the azobenzene units undergo reversible photoisomerization independently, in the nanofibers they are coupled via intermolecular interactions and switch cooperatively as evidenced by unusual thermal and kinetic behavior. We find that the photoisomerization rate from the Z-isomer to the E-isomer depends on the fraction of Z-azobenzene in the nanofibers, and is increased by more than a factor of 4 in Z-rich fibers when compared to E-rich fibers. This demonstrates the great potential of coupling individual photochromic units for increasing their quantum efficiency in the solid state with potential relevance for actuation and sensing. Nature Publishing Group 2016-05-10 /pmc/articles/PMC4861954/ /pubmed/27161608 http://dx.doi.org/10.1038/srep25605 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Weber, Christopher Liebig, Tobias Gensler, Manuel Zykov, Anton Pithan, Linus Rabe, Jürgen P. Hecht, Stefan Bléger, David Kowarik, Stefan Cooperative Switching in Nanofibers of Azobenzene Oligomers |
title | Cooperative Switching in Nanofibers of Azobenzene Oligomers |
title_full | Cooperative Switching in Nanofibers of Azobenzene Oligomers |
title_fullStr | Cooperative Switching in Nanofibers of Azobenzene Oligomers |
title_full_unstemmed | Cooperative Switching in Nanofibers of Azobenzene Oligomers |
title_short | Cooperative Switching in Nanofibers of Azobenzene Oligomers |
title_sort | cooperative switching in nanofibers of azobenzene oligomers |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4861954/ https://www.ncbi.nlm.nih.gov/pubmed/27161608 http://dx.doi.org/10.1038/srep25605 |
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