Synthesis and Characterization of New Linear <i>π</i>-Conjugated Molecules Containing Bis(ethynylpyridine) Units with a Benzothiadiazole Spacer
作者:Md. Akhtaruzzaman、Masaaki Tomura、Md. Badruz Zaman、Jun-ichi Nishida、Yoshiro Yamashita
DOI:10.1021/jo0202334
日期:2002.11.1
Three novel 4,7-bis(n-pyridylethynyl)-2,1,3-benzothiadiazoles (n = 2, 3, and 4) were synthesized by using the Sonogashira cross-coupling reaction of 4,7-dibromo-2,1,3-benzothiadiazole with the corresponding ethynylpyridines in the presence of a Pd(II) catalyst. The viologen analogues were also prepared by methylation of pyridyl nitrogen atoms. X-ray structure analysis of these compounds revealed the
利用4,7-dibromo-2,1的Sonogashira交叉偶联反应合成了三种新颖的4,7-双(n-吡啶基乙炔基)-2,1,3-苯并噻二唑(n = 2、3和4)。 Pd(II)催化剂存在下,3-3-苯并噻二唑与相应的乙炔基吡啶。紫精类似物也通过吡啶基氮原子的甲基化制备。这些化合物的X射线结构分析显示线性分子结构具有不寻常的柱状晶体结构。将苯并噻二唑部分插入乙炔-吡啶骨架中导致电子亲和力大大增加,并且在此获得的双吡啶基化合物显示出高的荧光量子产率。