Effect of the linkages on the self-assembly and photophysical properties of 4,7-diphenyl-2,1,3-benzothiadiazole-based luminescent polycatenars
Effect of the linkages on the self-assembly and photophysical properties of 4,7-diphenyl-2,1,3-benzothiadiazole-based luminescent polycatenars
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连接对4,7-二苯基1-2,1,3-苯并噻二唑基发光聚链烯自组装和光物理性质的影响
DOI：
10.1016/j.molliq.2019.04.121
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发表时间：
2019-07
影响因子：
6
通讯作者：
Xiaohong Cheng
中科院分区：
文献类型：
--
作者：
Jinliang Hu;Yulong Xiao;Qing Chang;Hongfei Gao;Xiaohong Cheng
三个系列的基于 4,7-二苯基-2,1,3-苯并噻二唑 (DBTD) 的聚链酯包含通过醚 (-OCH2-)、酯 (-OOC-) 或酰胺 (-HNCO-) 键连接到两端的 3,4,5-三烷氧基苯单元的中心 4,7-二苯基-2,1,3-苯并噻二唑部分 以Suzuki偶联反应为关键步骤合成。连接的极性对其自组装和光物理性质有很大影响。醚和酰胺化合物都是介晶，而酯化合物是非介晶。醚类化合物显示出Colhex/p6mm相，而酰胺类化合物则根据温度显示出两种柱状相，即具有p2mm晶格的柱状矩形相和具有p6mm晶格的柱状六方相。柱相可以在电场或机械剪切下对齐。醚和酰胺化合物的最大吸收和发射显示出显着的红移。在固体和凝胶状态下，醚类和酰胺类化合物均发出黄色发光，而酯类化合物则发出绿色发光。
Three series of 4,7-diphenyl-2,1,3-benzothiadiazole (DBTD) based polycatenars containing a central 4,7-diphenyl-2,1,3-benzothiadiazole moiety connected to 3,4,5-trialkoxyl benzene units at both ends through ether (-OCH2-), ester (-OOC-) or amide (-HNCO-) linkages were synthesizedviaSuzuki coupling reaction as key step. The polarities of the linkages had great effect on their self-assembly and photophycial properties. Both ether and amide compounds were mesogens, while the ester compounds were non-mesogens. The ether compounds displayed Colhex/p6mmphases, while the amide compound displayed two kinds of columnar phasesi.e.columnar rectangular phase withp2mmand columnar hexagonal phase withp6mmlattices depending on temperature. The column phases could be aligned in electric field or under mechanical shearing. The ether and amide compounds showed the significant red-shifted maximum absorption and emission. In the solid and gel states, both ether and amide compounds were yellow luminescence, while ester compounds were green luminescence.
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