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説明:

Most mechanochromic luminescent compounds are crystalline and highly hydrophobic; however, mechanochromic luminescent molecular assemblies comprising amphiphilic molecules have rarely been explored. This study investigated mechanochromic luminescent supramolecular fibers composed of dumbbell-shaped 9,10-bis(phenylethynyl)anthracene-based amphiphiles without any tetraethylene glycol (TEG) substituents or with two TEG substituents. Both amphiphiles formed water-insoluble supramolecular fibers via linear hydrogen bond formation. Both compounds acquired water solubility when solid samples composed of supramolecular fibers were ground. Grinding induces the conversion of one-dimensional supramolecular fibers into micellar assemblies where fluorophores can form excimers, thereby resulting in a large redshift in the fluorescence spectra. Excimer emission from the ground amphiphile without TEG chains was retained after dissolution in water. The micelles were stable in water because hydrophilic dendrons surrounded the hydrophobic luminophores. By contrast, when water was added to a ground amphiphile having TEG substituents, fragmented supramolecular fibers with the same molecular arrangement as the initial supramolecular fibers were observed, because fragmented fibers are thermodynamically preferable to micelles as the hydrophobic arrays of fluorophores are covered with hydrophilic TEG chains. This leads to the recovery of the initial fluorescent properties for the latter amphiphile. These supramolecular fibers can be used as practical mechanosensors to detect forces at the mesoscale.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: supramolecular polymers, mechanochromic luminescence, grind-induced water solubility, atomic force microscopy, transmission electron microscopy

刊行年月日: 2024-03-10

出版者: Wiley

掲載誌:

• Small (ISSN: 16136810) p. 1613-1613 2400063

研究助成金:

• Core Research for Evolutional Science and Technology JPMJCR20B2
• Japan Society for the Promotion of Science JP23H04878
• Japan Society for the Promotion of Science JP23H04874
• Japan Society for the Promotion of Science JP23H04879
• Japan Society for the Promotion of Science JP16K17885

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/smll.202400063

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更新時刻: 2024-08-19 16:30:14 +0900

MDRでの公開時刻: 2024-08-19 16:30:14 +0900