In search of efficient solubilizing groups for liquid and luminescent oligo(phenylene-thiophene) chromophores
作者:Yuriy N. Luponosov、Dmitry O. Balakirev、Ivan V. Dyadishchev、Alexander N. Solodukhin、Marina A. Obrezkova、Evgeniya A. Svidchenko、Nikolay M. Surin、Sergey A. Ponomarenko
DOI:10.1039/d0tc04536e
日期:——
liquefaction for them. It was revealed that oligomers with long and branched alkyl SGs still retain high crystallinity, whereas oligomers with alkyl-oligodimethylsiloxane SGs combine very low glass transition temperatures (up to −111 °C) with a liquid-crystalline behaviour. The alkylsilyl SGs were found to be the most efficient, since the oligomers end-capped with trihexyl- and tri(2-butyloctyl)silyl
在这项工作中,具有刚性封端的,共轭的4,4'-双(2-噻吩基)联苯片段被各种类型的增溶基团(SGs)(例如烷基或烷基甲硅烷基或烷基-低聚二甲基硅氧烷)封端的低聚物的合成被报道。与具有简单的己基或三甲基甲硅烷基SG的模型高结晶性低聚物相比,对它们的热和光学性质以及流变学进行了全面研究,这使我们能够阐明结构-性质的相关性,并在液化方面找到了最强大的SG类型。结果表明,具有长链和支链烷基SG的低聚物仍保持较高的结晶度,而具有烷基-低聚二甲基硅氧烷SG的低聚物将极低的玻璃化转变温度(高达-111°C)与液晶性能结合在一起。已发现烷基甲硅烷基SG最有效,因为被三己基和三(2-丁基辛基)甲硅烷基SG封端的低聚物是液体,并且玻璃化转变温度(最高-60°C)和低粘度(最高1.94 Pa s)。所制备的所有低聚物均具有相似的光吸收/发光光谱,并且溶液中的光致发光量子产率较高(90-95%),而对SG类型没有