Asymmetric Living Supramolecular Polymerization: Precise Fabrication of One-Handed Helical Supramolecular Polymers
Asymmetric Living Supramolecular Polymerization: Precise Fabrication of One-Handed Helical Supramolecular Polymers
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DOI：
10.1002/anie.202207028
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发表时间：
2022-07-08
影响因子：
16.6
通讯作者：
Wu, Zong-Quan
中科院分区：
文献类型：
--
作者：
Wang, Chao;Xu, Lei;Wu, Zong-Quan
对半导体聚合物的组织进行编程以形成定义明确的纳米结构对于制造功能材料是可取的。本工作制备了含螺旋PCA的聚(胆固醇烯)-b-聚(3-己基噻吩基)(PCA-b-P3HT)和含有非手性PAA链段的聚(烷氧基烯)-b-聚(3-己基噻吩基)(PAA-b-P3HT)半导体共聚物。P3HT的结晶和PCA的螺旋性促使PCA-b-P3HT自组装成球形纳米粒子，并逐渐转变为单手螺旋纳米纤维。PCA的手性转移到超分子结构，导致P3HT具有较高的光学活性。有趣的是，PCA-b-P3HT的手性种子胶束诱导了非手性PAA-b-P3HT的不对称共聚，从而得到了螺旋度和长度可控的螺旋超分子嵌段共聚物。值得注意的是，超分子共聚物表现出白光发射和圆偏振发光。
Programming the organization of semiconducting polymers to form well-defined nanoarchitectures is desirable for fabricating functional materials. In this work, semiconducting copolymers, poly(cholesterol allene)-b-poly(3-hexylthiophene) (PCA-b-P3HT) containing helical PCA and poly(alkoxy allene)-b-poly(3-hexylthiophene) (PAA-b-P3HT) containing achiral PAA segments, were prepared. Crystallization of P3HT and helicity of PCA drove PCA-b-P3HT self-assemble into spherical nanoparticles that gradually transformed into one-handed helical nanofibers. The chirality of PCA was transferred to the supramolecular architectures, induced high optical activity in P3HT. Interestingly, the chiral seed micelles of PCA-b-P3HT induced asymmetric copolymerization of achiral PAA-b-P3HT, which led to helical supramolecular block copolymers with defined helicity and controlled length. Remarkably, the supramolecular copolymers showed white-light emission and circularly polarized luminescence.