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- W2098889444 abstract "Abstract Bis‐ and monoureas hybridized with the oligo( p ‐phenylene vinylene) (OPV) π‐electronic segment and 3,4,5‐tridodecyloxyphenyl wedge were synthesized and their supramolecular polymerization in diluted solution, gel formation in concentrated solution, and liquid crystallinity in bulk state were investigated. Bisurea 1 a featuring a hexamethylene linker showed the highest supramolecular polymerization ability and formed tapelike nanofibers that can gelate various organic solvents. On the other hand, bisurea 1 b featuring a dodecamethylene linker and monourea 2 showed a lower degree of supramolecular polymerization, resulting in gel formations in a smaller variety of solvents. These results clearly reflect a high level of cooperativity between the two urea sites and the two OPV segments of 1 a upon hydrogen‐bonding and π–π stacking interactions, respectively. When the gels of 1 a , 1 b , and 2 were dried, all the compounds self‐organized into multilamellar superstructures. Thermal treatment of these lamellae at high temperatures induces columnar liquid‐crystalline mesophases as a result of microsegregation between the rigid OPV parts and the molten aliphatic wedges. These results demonstrate that the present molecular constituent is very useful for fabricating dye‐based functional assemblies providing nanoscale π‐electronic fibers, and solvent‐incorporated and bulk soft materials." @default.
- W2098889444 created "2016-06-24" @default.
- W2098889444 creator A5008202506 @default.
- W2098889444 creator A5019460243 @default.
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- W2098889444 creator A5049928137 @default.
- W2098889444 creator A5063399844 @default.
- W2098889444 creator A5082673530 @default.
- W2098889444 date "2008-05-29" @default.
- W2098889444 modified "2023-10-18" @default.
- W2098889444 title "Supramolecular Polymerization and Polymorphs of Oligo(p-phenylene vinylene)-Functionalized Bis- and Monoureas" @default.
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