Precise synthesis and efficient self-assembly of semiconducting polymers are of great interest. Herein, we report the controlled synthesis of π-conjugated poly(phenyl isocyanide)-b-poly(phenyleneethylene) (PPI-b-PPE) copolymers via chain extension of ethynyl 4-iodobenzene initiated by Pd(II)-terminated helical poly(phenyl isocyanide) (PPI). The in-situ-generated block copolymers self-assembled into various supramolecular architectures depending on the PPE length. The helical PPI segment induced the block copolymers with an appropriate PPE length self-assemble into helical nanofibers with a controlled size and defined helicity. Interestingly, the chiral assemblies of the block copolymers exhibit intense optical activity and emit clear circularly polarized luminescence.

中文翻译：

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π-共轭嵌段共聚物的精确合成和聚合诱导的手性自组装制备具有圆偏振发光的螺旋纳米纤维

半导体聚合物的精确合成和高效自组装具有重要意义。在此，我们报道了通过以Pd ( II) 为末端的螺旋聚(苯基异氰化物）（PPI）。原位生成的嵌段共聚物根据 PPE 长度自组装成各种超分子结构。螺旋 PPI 链段诱导具有适当 PPE 长度的嵌段共聚物自组装成具有可控尺寸和确定螺旋度的螺旋纳米纤维。有趣的是，嵌段共聚物的手性组装体表现出强烈的光学活性并发出清晰的圆偏振光。