Insulated molecular wire with highly conductive pi-conjugated polymer core.
We have recently developed a new method for synthesizing polyrotaxanes with a high covering ratio, rigidity, photoluminescence efficiency, and solubility in a variety of organic solvents through the polymerization of structurally defined rotaxane monomers. The rigid rodlike structure of the pi-conjugated core polymers in these polyrotaxanes is thought to facilitate the effective transport of charge carriers. Here we applied this method to the synthesis of a polyrotaxane having a poly(phenylene ethynylene) backbone by the Sonogashira copolymerization of a structurally defined rotaxane with a linker molecule. According to time-resolved microwave conductivity and transient absorption spectroscopy measurements, the hole mobility along the pi-conjugated polymer chain of the polyrotaxane thus formed was extremely high and comparable to that in amorphous silicon.
Terao
Jun
J
Department 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
Tanaka
Yuji
Y
Tsuda
Susumu
S
Kambe
Nobuaki
N
Taniguchi
Masateru
M
Kawai
Tomoji
T
Saeki
Akinori
A
Seki
Shu
S