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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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Tunable columnar organization by twisted stacking of end-capped aromatic rods

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Title
Tunable columnar organization by twisted stacking of end-capped aromatic rods
Other Titles
Tunable columnar organization by twisted stacking of end-capped aromatic rods
Author
Huang, ZhegangRyu, Ja-HyoungLee, EunjiLee, Myongsoo
Issue Date
2007-12
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v.19, no.26, pp.6569 - 6574
Abstract
The dumbbell-shaped aromatic amphiphilic molecules consisting of hexa-p-phenylene-conjugated carbazole moieties on both ends as a rigid rod segment and oligoether chains with different cross-sections (i.e., linear branch (1), dibranch (2), and tetrabranch (3)) attached to a carbazole as flexible chains were synthesized and their self-assembling behavior investigated using DSC, X-ray scatterings, and TEM. These dumbbell-shaped molecules based on an end-capped rod segment self-assemble into a tunable 21) supramolecular structure depending on cross-sectional area of the flexible dendritic chain. With increasing cross-sectional area of the flexible chains, the 21) structure changes from rectangular to oblique columnar structures with a successive increase in the lattice constant a relative to b. This structural change is also accompanied by increasing temperature as in the case of 2 and 3. The molecular rearrangements at the phase transitions were proposed to undergo a scissoring motion of the two adjacent rods along the column axis. Considering that all other self-assembling systems based on rigid rod segments have a strong tendency to be aligned parallel to each other, the remarkable feature of the end-capped rod segment investigated in this study is the ability to control 2D supramolecular structure through a unique scissoring motion between the two adjacent stacked rods
URI
https://scholarworks.unist.ac.kr/handle/201301/12128
URL
http://pubs.acs.org/doi/abs/10.1021/cm7028189
DOI
10.1021/cm7028189
ISSN
0897-4756
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CHM_Journal Papers
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