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Controlling the Conformational Changes in Donor–Acceptor [4]-Dendralenes through Intramolecular Charge-Transfer Processes
The synthesis of two [4]-dendralene compounds incorporating thiophene-(p-nitrophenyl) donor–acceptor units is presented. The dendralenes adopt two different conformers in solution and solid state and the transformation between the structures can be controlled by light and heat. The electron-donating...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
WILEY-VCH Verlag
2009
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3784042/ https://www.ncbi.nlm.nih.gov/pubmed/19760710 http://dx.doi.org/10.1002/chem.200900656 |
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author | Kanibolotsky, Alexander L Forgie, John C McEntee, Greg J Talpur, M Munsif A Skabara, Peter J Westgate, Thomas DJ McDouall, Joseph JW Auinger, Michael Coles, Simon J Hursthouse, Michael B |
author_facet | Kanibolotsky, Alexander L Forgie, John C McEntee, Greg J Talpur, M Munsif A Skabara, Peter J Westgate, Thomas DJ McDouall, Joseph JW Auinger, Michael Coles, Simon J Hursthouse, Michael B |
author_sort | Kanibolotsky, Alexander L |
collection | PubMed |
description | The synthesis of two [4]-dendralene compounds incorporating thiophene-(p-nitrophenyl) donor–acceptor units is presented. The dendralenes adopt two different conformers in solution and solid state and the transformation between the structures can be controlled by light and heat. The electron-donating components of the dendralenes are represented by bromothienyl (in 13) and ethylenedioxythiophene(EDOT)-thienyl (in 15) end-groups. The most facile transformation involves the isomerisation of donor–acceptor conjugated systems (a conformers) into structures in which only the thiophenes are conjugated (b conformers), and this process is driven by ambient light. The structures of the two conformers of compound 13 are confirmed by single-crystal X-ray diffraction studies and the structural changes in both compounds have been monitored by (1)H NMR spectroscopy and absorption studies. The transformations were found to be first-order processes with rate constants of k = 0.0027 s(−1) and k = 0.00022 s(−1) for 13 and 15, respectively. Density functional theory calculations at the B3LYP/6-31G∗ level give credence to the proposed mechanism for the a→b conversion, which involves photoinduced intramolecular charge transfer (ICT) as the key step. The EDOT derivative (15) can be polymerised by electrochemical oxidation and a combination of cyclic voltammetry and UV/Vis spectroelectrochemical experiments indicate that the a conformer can be trapped and stabilised in the solid state. |
format | Online Article Text |
id | pubmed-3784042 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2009 |
publisher | WILEY-VCH Verlag |
record_format | MEDLINE/PubMed |
spelling | pubmed-37840422013-10-01 Controlling the Conformational Changes in Donor–Acceptor [4]-Dendralenes through Intramolecular Charge-Transfer Processes Kanibolotsky, Alexander L Forgie, John C McEntee, Greg J Talpur, M Munsif A Skabara, Peter J Westgate, Thomas DJ McDouall, Joseph JW Auinger, Michael Coles, Simon J Hursthouse, Michael B Chemistry Full Paper The synthesis of two [4]-dendralene compounds incorporating thiophene-(p-nitrophenyl) donor–acceptor units is presented. The dendralenes adopt two different conformers in solution and solid state and the transformation between the structures can be controlled by light and heat. The electron-donating components of the dendralenes are represented by bromothienyl (in 13) and ethylenedioxythiophene(EDOT)-thienyl (in 15) end-groups. The most facile transformation involves the isomerisation of donor–acceptor conjugated systems (a conformers) into structures in which only the thiophenes are conjugated (b conformers), and this process is driven by ambient light. The structures of the two conformers of compound 13 are confirmed by single-crystal X-ray diffraction studies and the structural changes in both compounds have been monitored by (1)H NMR spectroscopy and absorption studies. The transformations were found to be first-order processes with rate constants of k = 0.0027 s(−1) and k = 0.00022 s(−1) for 13 and 15, respectively. Density functional theory calculations at the B3LYP/6-31G∗ level give credence to the proposed mechanism for the a→b conversion, which involves photoinduced intramolecular charge transfer (ICT) as the key step. The EDOT derivative (15) can be polymerised by electrochemical oxidation and a combination of cyclic voltammetry and UV/Vis spectroelectrochemical experiments indicate that the a conformer can be trapped and stabilised in the solid state. WILEY-VCH Verlag 2009-11-02 2009-09-16 /pmc/articles/PMC3784042/ /pubmed/19760710 http://dx.doi.org/10.1002/chem.200900656 Text en Copyright © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim http://creativecommons.org/licenses/by/2.5/ Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation. |
spellingShingle | Full Paper Kanibolotsky, Alexander L Forgie, John C McEntee, Greg J Talpur, M Munsif A Skabara, Peter J Westgate, Thomas DJ McDouall, Joseph JW Auinger, Michael Coles, Simon J Hursthouse, Michael B Controlling the Conformational Changes in Donor–Acceptor [4]-Dendralenes through Intramolecular Charge-Transfer Processes |
title | Controlling the Conformational Changes in Donor–Acceptor [4]-Dendralenes through Intramolecular Charge-Transfer Processes |
title_full | Controlling the Conformational Changes in Donor–Acceptor [4]-Dendralenes through Intramolecular Charge-Transfer Processes |
title_fullStr | Controlling the Conformational Changes in Donor–Acceptor [4]-Dendralenes through Intramolecular Charge-Transfer Processes |
title_full_unstemmed | Controlling the Conformational Changes in Donor–Acceptor [4]-Dendralenes through Intramolecular Charge-Transfer Processes |
title_short | Controlling the Conformational Changes in Donor–Acceptor [4]-Dendralenes through Intramolecular Charge-Transfer Processes |
title_sort | controlling the conformational changes in donor–acceptor [4]-dendralenes through intramolecular charge-transfer processes |
topic | Full Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3784042/ https://www.ncbi.nlm.nih.gov/pubmed/19760710 http://dx.doi.org/10.1002/chem.200900656 |
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