A highly soluble coumarin monomer, 3,7-dibromo-4-octyloxycoumarin, was developed as the novel building block for π−conjugated polymers. Sonogashira coupling reaction, dehalogenation reaction, and Suzuki-Miyaura coupling reaction were carried out by using this new monomer as the main chain unit of π−conjugated polymer for polymerization. Introduction of a long alkoxy chain into coumarin monomer unit significantly improved the solubility of thus obtained polymers. The absorption and emission spectra of polymers showed red-shift compared to those of monomer, indicating the expansion of the π−conjugated system in the polymer main chain. Especially the polymers synthesized via Sonogashira coupling formed excimer in film state. The polymers showed acid-base responsibility with the addition of KOHaq and HClaq.

中文翻译：

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主链含高溶性香豆素单元的新型π共轭聚合物的交叉偶联、脱卤反应及其酸碱响应荧光

一种高度可溶的香豆素单体，3,7-二溴-4-辛氧基香豆素，被开发为 π-共轭聚合物的新型结构单元。以这种新单体作为π-共轭聚合物的主链单元进行聚合，进行了Sonogashira偶联反应、脱卤反应和Suzuki-Miyaura偶联反应。将长烷氧基链引入香豆素单体单元中显着改善了由此获得的聚合物的溶解度。与单体相比，聚合物的吸收和发射光谱出现红移，表明聚合物主链中π-共轭体系的扩展。特别是通过Sonogashira偶联合成的聚合物形成薄膜状态的准分子。添加 KOHaq 和 HClaq 后，聚合物表现出酸碱响应性。