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Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes
As structure defined cutouts of the graphene lattice, nanographene molecules have gained plenty of attention because of their high potential for versatile applications in organic electronics and energy conversion devices and as ideal model systems for the better understanding of intrinsic structure–...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Royal Society of Chemistry
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6624990/ https://www.ncbi.nlm.nih.gov/pubmed/31367317 http://dx.doi.org/10.1039/c9sc01538h |
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author | Umeyama, Tomokazu Hanaoka, Takuma Yamada, Hiroki Namura, Yuki Mizuno, Satoshi Ohara, Tomoya Baek, Jinseok Park, JaeHong Takano, Yuta Stranius, Kati Tkachenko, Nikolai V. Imahori, Hiroshi |
author_facet | Umeyama, Tomokazu Hanaoka, Takuma Yamada, Hiroki Namura, Yuki Mizuno, Satoshi Ohara, Tomoya Baek, Jinseok Park, JaeHong Takano, Yuta Stranius, Kati Tkachenko, Nikolai V. Imahori, Hiroshi |
author_sort | Umeyama, Tomokazu |
collection | PubMed |
description | As structure defined cutouts of the graphene lattice, nanographene molecules have gained plenty of attention because of their high potential for versatile applications in organic electronics and energy conversion devices and as ideal model systems for the better understanding of intrinsic structure–property correlations of graphenes. In this study, well-defined nanographenes with sp(2) carbon networks of different sizes, hexa-peri-hexabenzocoronene (HBC) and its rectangularly π-extended version, a short graphene nanoribbon (GNR), have been covalently functionalized with photoactive porphyrin molecules. On the basis of their spectroscopic studies, the photodynamics of the porphyrin-linked nanographenes was found to be influenced substantially by the size of the nanographenes. Photoexcitation of the porphyrin–HBC linked system led to exclusive energy transfer (EnT) from the first singlet excited state (S(1)) of the nanographene to the porphyrin, whereas opposite selective EnT occurred from the first and second singlet excited states (S(1) and S(2)) of the porphyrin to the nanographene in the porphyrin–GNR linked system. In particular, ultrafast efficient EnTs from both the S(2) and S(1) states of the porphyrin to GNR mimic the corresponding ultrafast EnTs from the S(2) and S(1) states of carotenoids to chlorophylls in light-harvesting systems of natural photosynthesis. Such unique photophysical properties will be useful for the rational design of carbon-based photofunctional nanomaterials for optoelectronics and solar energy conversion devices. |
format | Online Article Text |
id | pubmed-6624990 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-66249902019-07-31 Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes Umeyama, Tomokazu Hanaoka, Takuma Yamada, Hiroki Namura, Yuki Mizuno, Satoshi Ohara, Tomoya Baek, Jinseok Park, JaeHong Takano, Yuta Stranius, Kati Tkachenko, Nikolai V. Imahori, Hiroshi Chem Sci Chemistry As structure defined cutouts of the graphene lattice, nanographene molecules have gained plenty of attention because of their high potential for versatile applications in organic electronics and energy conversion devices and as ideal model systems for the better understanding of intrinsic structure–property correlations of graphenes. In this study, well-defined nanographenes with sp(2) carbon networks of different sizes, hexa-peri-hexabenzocoronene (HBC) and its rectangularly π-extended version, a short graphene nanoribbon (GNR), have been covalently functionalized with photoactive porphyrin molecules. On the basis of their spectroscopic studies, the photodynamics of the porphyrin-linked nanographenes was found to be influenced substantially by the size of the nanographenes. Photoexcitation of the porphyrin–HBC linked system led to exclusive energy transfer (EnT) from the first singlet excited state (S(1)) of the nanographene to the porphyrin, whereas opposite selective EnT occurred from the first and second singlet excited states (S(1) and S(2)) of the porphyrin to the nanographene in the porphyrin–GNR linked system. In particular, ultrafast efficient EnTs from both the S(2) and S(1) states of the porphyrin to GNR mimic the corresponding ultrafast EnTs from the S(2) and S(1) states of carotenoids to chlorophylls in light-harvesting systems of natural photosynthesis. Such unique photophysical properties will be useful for the rational design of carbon-based photofunctional nanomaterials for optoelectronics and solar energy conversion devices. Royal Society of Chemistry 2019-06-05 /pmc/articles/PMC6624990/ /pubmed/31367317 http://dx.doi.org/10.1039/c9sc01538h Text en This journal is © The Royal Society of Chemistry 2019 http://creativecommons.org/licenses/by-nc/3.0/ This article is freely available. This article is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported Licence (CC BY-NC 3.0) |
spellingShingle | Chemistry Umeyama, Tomokazu Hanaoka, Takuma Yamada, Hiroki Namura, Yuki Mizuno, Satoshi Ohara, Tomoya Baek, Jinseok Park, JaeHong Takano, Yuta Stranius, Kati Tkachenko, Nikolai V. Imahori, Hiroshi Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes |
title | Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes
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title_full | Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes
|
title_fullStr | Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes
|
title_full_unstemmed | Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes
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title_short | Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes
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title_sort | exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6624990/ https://www.ncbi.nlm.nih.gov/pubmed/31367317 http://dx.doi.org/10.1039/c9sc01538h |
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