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Photoefficient 2nd generation molecular motors responsive to visible light

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Abstract

Molecular motors that operate with high efficiency using visible light are attractive for numerous applications. Here the synthesis and characterisation of three novel visible light switchable 2nd generation molecular motors is presented. Two of them are based on push–pull systems with the third one possessing an extended π-system. With a maximum effective excitation wavelength of 530 nm we designed the most red-shifted artificial rotary motor known to date. All three motors benefit from efficient switching to the metastable isomer, high quantum yields and excellent photostability setting them apart from visible light switchable motors reported previously. The activation barriers of the rate-determining thermal helix inversion could be accurately predicted using DFT calculations and differences between the motors can be explained by distinct transition state structures. Enantiomers of push–pull motors were successfully separated and their helical twisting power in E7 liquid crystals was determined.

Graphical abstract: Photoefficient 2nd generation molecular motors responsive to visible light

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Publication details

The article was received on 02 May 2019, accepted on 31 Jul 2019 and first published on 09 Aug 2019


Article type: Edge Article
DOI: 10.1039/C9SC02150G
Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Photoefficient 2nd generation molecular motors responsive to visible light

    L. Pfeifer, M. Scherübl, M. Fellert, W. Danowski, J. Cheng, J. Pol and B. L. Feringa, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C9SC02150G

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