Aggregation-induced red-shifted emission and fluorescent patterning of poly(aryleneethynylene) with a lateral AIEgen substituent
Aggregation-induced red-shifted emission and fluorescent patterning of poly(aryleneethynylene) with a lateral AIEgen substituent
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DOI：
10.1039/c9tc05854k
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发表时间：
2020-01
影响因子：
6.4
通讯作者：
Zhengong Meng;Kuo Fu;Yang Zhao;Yanfeng Zhang;Zhuoxun Wei;Yi Liu;Xiang-kui Ren;Zhenqiang Yu
中科院分区：
文献类型：
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作者：
Zhengong Meng;Kuo Fu;Yang Zhao;Yanfeng Zhang;Zhuoxun Wei;Yi Liu;Xiang-kui Ren;Zhenqiang Yu
聚苯乙烯基共轭聚合物因其对聚集行为、荧光发射和通过非共价堆叠相互作用的电子耦合的基本理解而引起了人们的极大兴趣。本文研究了最近合成的侧链上含有AIEgen取代基的共轭聚合物P1的聚集诱导发射红移，并制备了具有相同主链的类似聚合物P2，从光物理性质上研究了电子耦合过程和聚集行为。2D-WAXD结果表明，P1具有片状结构，近晶相沿近晶层呈交错排列的分子堆积。在THF溶液中，由于主链的旋转和侧链取代基的堆叠行为，在固体状态下，从454nm到564nm发生了明显的红移，红移约110 nm。聚苯乙烯衍生物的刚性共轭度高，易结晶；在侧链末端引入多烷基尾部，改善了其流变性能，使其适用于纳米印迹光刻技术制备高分辨率的高有序荧光图案，为拓展其未来的光电应用开辟了道路。
Poly(aryleneethynylene)-based conjugated polymers have attracted significant interest for the fundamental understanding of aggregation behavior, fluorescence emission and electronic coupling through noncovalent stacking interactions. Herein, we investigated the aggregation-induced red-shift in emission of a recently synthesized conjugated polymer P1 with AIEgen substituents on the side chain, and a similar counterpart P2 with the same backbone was also prepared to study the electronic coupling processes and aggregation behaviors from the photophysical properties. The result from 2D-WAXD indicated that P1 had a sheet-like structure and the smectic phase was observed to present interdigitated molecular packing along the smectic layer. The photoluminescence emission showed a distinct red shift of about 110 nm from 454 nm in THF solution to 564 nm in the solid state, which is due to the rotation of the main chain and the stacking behavior of the side-chain substituents. The poly(aryleneethynylene) derivatives were easy to crystallize because of their high degree of rigid conjugation; herein, the introduction of multi-alkyl tails into the terminal of the side chains improved the rheological properties and made them suitable for fabricating highly-ordered fluorescent patterns with high resolution by nanoimprinting lithography, which would open an avenue to extend the future optoelectronic applications.