Synthesis and characterization of polythiophene derivatives with nitrogen heterocycles on the side chain
作者:Koji Takagi、Eiki Kawagita、Ryo Kouchi
DOI:10.1002/pola.27228
日期:2014.8.1
metathesis reactions of 5,5′‐dibromo‐4‐(5″‐hexylpyridine‐2″‐yl)‐2,2′‐bithiophene (M2) and 5,5′‐dibromo‐4‐(5″‐hexylpyrimidine‐2″‐yl)‐2,2′‐bithiophene (M3) also occurred at the ortho‐position of the nitrogen heterocycle. The Kumada coupling polymerizations gave polyM2 and polyM3 having the head‐to‐tail content of 75% and 85%, respectively. The UV–vis spectra of polymers suggested that the polymer conformation
2,5-二溴-3-(5'-己基吡啶-2'-基)噻吩(M1)与i -PrMgCl的格利雅(Grignard)易位反应提供了5-溴-2-氯镁(3'(5'-己基吡啶-2) '-基)噻吩(GM1)的选择性为86%。通过Ni(dppp)Cl 2的Kumada偶联聚合得到的聚M1具有大致控制的分子量在6700和23,400之间。使用凝胶渗透色谱和基质辅助的激光解吸/电离飞行时间质谱进行表征,表明镍催化剂从扩散端扩散。基于GC和1 H NMR光谱,聚M1的头尾含量计算为89%。5,5'-二溴-4-(5''-己基吡啶-2''-基)-2,2'-联噻吩(M2)和5,5'-二溴-4-(5' '-)的区域选择性格利雅(Grignard)易位反应己基嘧啶-2″基)-2,2′-联噻吩(M3)也出现在氮杂环的邻位。熊田偶联聚合法得到的头对尾含量分别为75%和85%的聚M2和聚M3。聚合物的紫外-可见光谱表明,聚合物的构象按聚M1