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Controlling the conformational changes in donor-acceptor [4]-dendralenes through intramolecular charge-transfer processes
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Kanibolotsky, Alexander L., Forgie, John C., McEntee, Greg J., Talpur, M. Munsif A., Skabara, Peter J., Westgate, Thomas D. J., McDouall, Joseph J. W., Auinger, Michael, Coles, Simon J. and Hursthouse, Michael B. (2009) Controlling the conformational changes in donor-acceptor [4]-dendralenes through intramolecular charge-transfer processes. Chemistry - A European Journal, Volume 15 (Number 43). pp. 11581-11593. doi:10.1002/chem.200900656 ISSN 0947-6539.
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Official URL: http://dx.doi.org/10.1002/chem.200900656
Abstract
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 1H 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[RIGHTWARDS ARROW]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.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Journal or Publication Title: | Chemistry - A European Journal | ||||||||
| Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA | ||||||||
| ISSN: | 0947-6539 | ||||||||
| Official Date: | 23 October 2009 | ||||||||
| Dates: |
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| Volume: | Volume 15 | ||||||||
| Number: | Number 43 | ||||||||
| Page Range: | pp. 11581-11593 | ||||||||
| DOI: | 10.1002/chem.200900656 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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