Synthesis of polyether-bridged bithiophenes and their electrochemical polymerization to electrochromic property

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• 作者：Yongjing Hu^a ; Dufen Hu^a ; Shouli Ming^a ; Xuemin Duan^a ; Feng Zhao^a ; Jian Hou^b ; Jingkun Xu^a ; ^{xujingkun@tsinghua.org.cn" class="auth_mail" title="E-mail the corresponding author} ; Fengxing Jiang^a ; ^{jiangfx@jxstnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：polyether ; bithiophene ; electrochemical polymerization ; electrochromic property
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 January 2016
• 年：2016
• 卷：189
• 期：Complete
• 页码：64-73
• 全文大小：2744 K

文摘

The polyether-bridged 2,2′-bithiophenes were designed with a single methylene between the thiophene ring and the first oxygen atom in polyether, and synthesized by the Williamson reaction and the Suzuki coupling reaction. The electrochemical polymerization of as-synthesized monomers were investigated. The as-prepared polymers of polyether-bridged 2,2′-bithiophenes (P(BT-E-BT)) show a better electrochemical activity with a high-quality film on electrodes compared to the polymers of polyether-bridged thiophenes (T-E-T) in a neutral media. The P(BT-E-BT) exhibited broad absorption in near infrared region with the band gaps (2.03–2.05 eV) and the good thermal stability. The versatile coloration change for P(BT-E-BT) films on a ITO glass electrode were achieved from salmon pink (neutral state) to blue–green and transmissive rusty red (oxidized states). Further electrochromic investigation implied that the polymer P(BT-E-BT) films showed moderate to high contrast ratios, good coloration efficiencies, low switching voltages, fast response times, excellent stabilities and colour persistence as potential electrochromic materials.