Multi‐state photoluminescent properties of an overcrowded alkene‐based molecular motor in aggregates
Yahan Shan,
Jinyu Sheng,
Qi Zhang,
Marc C. A. Stuart,
Da‐Hui Qu,
Ben L. Feringa
Affiliations
Yahan Shan
Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai China
Jinyu Sheng
Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials University of Groningen Groningen Netherlands
Qi Zhang
Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai China
Marc C. A. Stuart
Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials University of Groningen Groningen Netherlands
Da‐Hui Qu
Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai China
Ben L. Feringa
Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai China
Abstract Photoisomerization and photoluminescence are two distinct energy dissipation pathways in light‐driven molecular motors. The photoisomerization properties of discrete molecular motors have been well established in solution, but their photoluminescent properties have been rarely reported—especially in aggregates. Here, it is shown that an overcrowded alkene‐based molecular motor exhibits distinct dynamic properties in solution and aggregate states, for example, gel and solid states. Despite the poor emissive properties of molecular motors in solution, a bright emission is observed in the aggregate states, including in gel and the crystalline solid. The emission wavelength is highly dependent on the nature of the supramolecular packing and order in the aggregates. As a result, the fluorescent color can be readily tuned reversibly via mechanical grinding and vapor fuming, which provides a new platform for developing multi‐stimuli functional materials.
