期刊
CHEMICAL SCIENCE
卷 12, 期 21, 页码 7486-7497出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc01105g
关键词
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资金
- Horizon 2020 Framework Programme (ERC Advanced Investigator Grant) [694345]
- Netherlands Ministry of Education, Culture and Science [024.001.035]
- Marie Skodowska-Curie Action [838280, 793082]
- Centre for Information Technology of the University of Groningen
- Fondazione Banca d'Italia
- MIUR (Department of Excellence 2018 grant)
- NSF [CHE-CLP-1710191]
- Interdisciplinary Thematic Institute QMat, as part of the ITI 2021-2028 program of the University of Strasbourg
- CNRS
- Inserm, via the IdEx Unistra project of the French Investments for the Future Program [ANR 10 IDEX 0002]
- Inserm, via the SFRI STRAT'US project of the French Investments for the Future Program [ANR 20 SFRI 0012]
- Inserm, via the EUR QMAT project of the French Investments for the Future Program [ANR-17-EURE-0024]
- Inserm, via the Labex NIE project of the French Investments for the Future Program [ANR-11-LABX-0058_NIE]
- Marie Curie Actions (MSCA) [838280, 793082] Funding Source: Marie Curie Actions (MSCA)
The study presents a novel oxindole-based molecular motor with significant electronic push-pull character and a four-fold increase in photoisomerization quantum yield compared to previous motors in its class. Through a multidisciplinary approach involving synthesis, spectroscopies, and electronic structure modeling, the researchers elucidated the excited state dynamics and rotary mechanism of the motor, concluding that its rotational properties lie between fluorene-based molecular motors and biomimetic photoswitches.
Harvesting energy and converting it into mechanical motion forms the basis for both natural and artificial molecular motors. Overcrowded alkene-based light-driven rotary motors are powered through sequential photochemical and thermal steps. The thermal helix inversion steps are well characterised and can be manipulated through adjustment of the chemical structure, however, the insights into the photochemical isomerisation steps still remain elusive. Here we report a novel oxindole-based molecular motor featuring pronounced electronic push-pull character and a four-fold increase of the photoisomerization quantum yield in comparison to previous motors of its class. A multidisciplinary approach including synthesis, steady-state and transient absorption spectroscopies, and electronic structure modelling was implemented to elucidate the excited state dynamics and rotary mechanism. We conclude that the charge-transfer character of the excited state diminishes the degree of pyramidalisation at the alkene bond during isomerisation, such that the rotational properties of this oxindole-based motor stand in between the precessional motion of fluorene-based molecular motors and the axial motion of biomimetic photoswitches.
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