This paper describes the chemical and electrochemical synthesis of novel copolymers of thiophene and pyridine. Di-iodination of 3-hydroxypyridine 12 followed by O-substitution gave a series of ethers 14b–d and esters/carbamates 15a–d which were reacted with the stannylated bithiophene derivative 17 in a Stille cross-coupling reaction yielding poly (1b–d) and poly (2a–d) respectively. These chemical polymerisation reactions generally resulted in highly insoluble materials which were difficult to characterise. Ethers 14b–d and
esters/carbamates 15a–d gave O-substituted 3-hydroxy-2,6-di(2-thienyl)pyridines 1b–d and 2a–d respectively in Stille cross-coupling reactions with the stannylated thiophene 16. Ethers 1b–d underwent electrochemical polymerisation allowing the synthesis of O-alkylated polymers, poly (1b–d), with electrochemical band-gaps of 1.4 to 1.6 eV. In contrast, the esters/carbamates 2a–d could not be electropolymerised.
本文描述了
噻吩和
吡啶新型共聚物的
化学和电
化学合成。对3-
羟基吡啶12进行
双碘化后,通过O-取代反应得到了系列醚14b–d和酯/
氨基甲酸酯15a–d,这些化合物与
锡基双
噻吩衍
生物17在Stille交叉偶联反应中反应,分别生成聚合物poly (1b–d)和poly (2a–d)。这些
化学聚合反应通常导致高不溶性材料,难以表征。醚14b–d和酯/
氨基甲酸酯15a–d在与
锡基
噻吩16的Stille交叉偶联反应中分别生成O-取代的3-羟基-2,6-二(2-
噻吩基)
吡啶1b–d和2a–d。醚1b–d进行了电
化学聚合,从而合成了O-烷基化聚合物poly (1b–d),其电
化学带隙为1.4至1.6 eV。相比之下,酯/
氨基甲酸酯2a–d无法进行电聚合。