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Updated: Aug 5, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
Bifacial ladder polymers enabled by chirality-assisted synthesis that exhibit self-assembly and chirality-induced
Fumitaka Ishiwari1,2,3,4, Kazuharu Murotani5, Akinori Saeki6,7
1Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Osaka, Japan. ishiwari@chem.eng.osaka-u.ac.jp.
Researchers developed bifacial ladder polymers using a novel chirality-assisted strategy. These polymers exhibit strong chiroptical behavior and high chirality-induced spin selectivity, paving the way for advanced organic materials.
Area of Science:
- Polymer Chemistry
- Organic Materials Science
- Supramolecular Chemistry
Background:
- Structural advancements in polymers drive molecular organization and emergent functions.
- Ladder polymers offer rigid backbones with potential for unique properties.
Purpose of the Study:
- Introduce bifacial ladder polymers with differentiated molecular faces.
- Develop a chirality-assisted synthetic strategy for controlled polymer architecture.
- Investigate emergent chiroptical and spin-selective properties.
Main Methods:
- Design and synthesis of a C2-chiral 2,8-dibromoindenofluorene monomer.
- Suzuki-Miyaura polymerization with a diboronate comonomer.
- Regioselective ladderization to form bifacial ladder polymers.
Main Results:
- Successfully synthesized well-defined bifacial ladder polymers with preserved facial differentiation.
- Observed strong circular dichroism in solid-state thin films, indicating one-handed supramolecular helices.
- Demonstrated high chirality-induced spin selectivity (>90%) in thin films, superior to precursor polymers.
Conclusions:
- Bifacial ladder polymers represent a versatile platform for advanced organic materials.
- Facial differentiation and chirality are key to emergent chiroptical and spin-selective functions.
- This approach enables novel self-assemblies and functionalities in polymeric systems.
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