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Ryu, Ja-Hyoung
Supramolecular NanoMaterials Lab (SUN)
Research Interests
  • Supramolecular assembly, synthetic peptide assembly, cancer drug delivery

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Rigid-flexible block molecules based on a laterally extended aromatic segment: Hierarchical assembly into single fibers, flat ribbons, and twisted ribbons

Cited 33 times inthomson ciCited 32 times inthomson ci
Title
Rigid-flexible block molecules based on a laterally extended aromatic segment: Hierarchical assembly into single fibers, flat ribbons, and twisted ribbons
Author
Lee, EunjiHuang, ZhegangRyu, Ja-HyoungLee, Myongsoo
Issue Date
2008-08
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMISTRY-A EUROPEAN JOURNAL, v.14, no.23, pp.6957 - 6966
Abstract
Self-assembling rigid-flexible block molecules consisting of a laterally extended aromatic segment and different lengths of hydrophilic coils were synthesized and characterized. The block molecule based on a long polyethylene oxide) coil (1), in the melt state, shows an unidentified columnar structure, whereas the molecule with a shorter poly(ethylene oxide) coil (2) self-organizes into an oblique columnar structure. Further decrease in the poly(ethylene oxide) coil length as in the case of 3, on heating, induces a rectangular columnar structure in addition to an oblique columnar mesophase. In diethyl ether, 1 and 2 were observed to self-assemble into uniform nanofibers with bilayer packing. Remarkably, these elementary fibers were observed to further aggregate in a lateral way to form well-defined flat ribbons (1) and twisted ribbons (2) with solvent exchange of diethyl ether into methanol. Furthermore, the ribbons formed in methanol dissociated into elementary fibers in response to the addition of aromatic guest molecules. This transformation between ribbons and single fibers in response to the addition of guest molecules is attributed to the intercalation of aromatic substrates within the rigid segments and subsequent loosening of the aromatic stacking interactions. These results demonstrate that the introduction of a laterally extended aromatic segment into an amphiphilic molecular architecture can lead to the hierarchical formation from elementary fibers of nanoribbons with a tunable twist through controlled lateral interactions between aromatic segments.
URI
https://scholarworks.unist.ac.kr/handle/201301/8945
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=53849136609
DOI
10.1002/chem.200800664
ISSN
0947-6539
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CHM_Journal Papers
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