Electron-nuclear double-resonance observation of spatial extent of polarons in polythiophene and poly(3-alkylthiophene)

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• 作者：Shin-ichi Kuroda ; Kazuhiro Marumoto ; Toshinobu Sakanaka ; Norifumi Takeuchi ; Yukihiro Shimoi ; Shuji Abe ; Hisashi Kokubo ; Takakazu Yamamoto
• 刊名：Chemical Physics Letters
• 出版年：2007
• 出版时间：19 February 2007
• 年：2007
• 卷：435
• 期：4-6
• 页码：273-277
• 全文大小：312 K

文摘

Electron-nuclear double-resonance spectra of undoped polythiophene (PT) are reported in comparison with those of regioregular poly(3-alkylthiophene) (RR-P3AT). In PT, the maximum spin density reaches 0.06, corresponding to the polaron half-width of about 8 thiophene rings. This is contrasted with the half-width of about 10 thiophene rings in regioregular poly(3-hexylthiophene), RR-P3HT, and poly(3-octylthiophene), RR-P3OT. The observed spin densities of polarons in these polymers are compatible with theoretical values obtained for model oligomers. The different polaron extensions in PT and RR-P3AT are discussed in relation to the difference of local structures such as the planarity of the polymer backbones.