Polymers synthesized from (3-alkylthio)thiophenes by the FeCl₃ oxidation method

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• 作者：Xu ; J.M. ; Chan ; H.S.O. ; Ng ; S.C. ; Chung ; T.S.
• 关键词：(3-Alkylthio)thiophenes ; Conducting polymers ; FeCl₃ oxidative polymerization ; Chlorination
• 刊名：Synthetic Metals
• 出版年：2002
• 出版时间：December 2, 2002
• 年：2002
• 卷：132
• 期：1
• 页码：63-69
• 全文大小：155 K

文摘

Thiophenes substituted by alkylthio (hexylthio and dodecylthio) pedant groups were polymerized using the FeCl₃ oxidation method. The polymers were characterized using microanalyses, conductivity measurements, thermogravimetry (TG) and ¹H NMR, UV-Vis, FTIR and XPS. The polymers are regiorandom in structure as expected and have a head-to-tail (HT) content of about 80 % based on the ¹H NMR spectrum. Poly[(3-hexylthio)thiophenes] (PHTT), which carries the shorter side chain, exhibits a higher solubility in common organic solvents and is more thermally stable than the polymers with the longer dodecylthio poly[(3-dodecylthio)thiophenes] (PDDTT) chains. The polymers are moderately conductive after being doped by FeCl₃ or I₂. The high concentration of covalently bonded chlorine found from XPS and microanalysis and supported by ¹H NMR spectra suggests chlorination of the backbone occurred during the polymerization process. The influence of chlorination on the absorption spectra and conductivity were noted and discussed.