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Insulated molecular wire with highly conductive pi-conjugated polymer core
Jun Terao1, Yuji Tanaka, Susumu Tsuda
1Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, and PRESTO, Japan Science and Technology Agency (JST), Nishikyo-ku, Kyoto 615-8510, Japan. terao@scl.kyoto-u.ac.jp
Journal of the American Chemical Society
|November 26, 2009
Summary
Researchers synthesized a novel polyrotaxane with a poly(phenylene ethynylene) backbone, achieving high charge carrier mobility comparable to amorphous silicon. This breakthrough advances organic electronics through improved polymer conductivity.
Area of Science:
- Materials Science
- Polymer Chemistry
- Organic Electronics
Background:
- Polyrotaxanes are supramolecular structures with potential applications in charge transport.
- Developing polyrotaxanes with enhanced properties like rigidity and solubility is crucial for advanced materials.
- Existing methods for synthesizing polyrotaxanes often face limitations in achieving desired structural control and performance.
Purpose of the Study:
- To synthesize a novel polyrotaxane with a poly(phenylene ethynylene) backbone using a new polymerization method.
- To evaluate the charge transport properties, specifically hole mobility, of the synthesized polyrotaxane.
- To demonstrate the effectiveness of structurally defined rotaxane monomers in creating high-performance polymers.
Main Methods:
- Synthesis of structurally defined rotaxane monomers.
- Sonogashira copolymerization of rotaxane monomers with linker molecules to form polyrotaxanes.
- Characterization using time-resolved microwave conductivity and transient absorption spectroscopy.
Main Results:
- Successful synthesis of a polyrotaxane with a poly(phenylene ethynylene) backbone.
- Achieved high hole mobility along the polymer chain, comparable to amorphous silicon.
- Demonstrated high covering ratio, rigidity, photoluminescence efficiency, and solubility of the synthesized polyrotaxane.
Conclusions:
- The developed method enables the synthesis of high-performance polyrotaxanes with excellent charge transport properties.
- Structurally defined rotaxane monomers are effective building blocks for creating advanced pi-conjugated polymers.
- These findings open new avenues for polyrotaxanes in organic electronics and charge carrier applications.
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