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Controlled Synthesis, Chiral Assembly, and Circularly Polarized Luminescence of Poly(Phenyl Isocyanide)-Block-Polyfluorene Copolymers
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2023-05-09 , DOI: 10.1002/marc.202300159
Hui Zou 1 , Shan-Shan Han 1 , Guo-Qiang Li 1 , Li Zhou 1 , Na Liu 2 , Zong-Quan Wu 3
Affiliation  

In this work, π-conjugated block copolymers consisting of poly(phenyl isocyanide) (PPI) and polyfluorene (PF) segments are facilely prepared by one-pot sequential polymerization of phenyl isocyanide (monomer 1) and 7-bromo-9,9-dioctylfluorene-2-boronic acid pinacol ester (monomer 2). The Pd(II)-terminated PPI is first prepared via polymerizing monomer 1 catalyzed with phenyl alkyne-Pd(II) complex and then utilized to initiate the controlled Suzuki cross-coupling polymerization of monomer 2, yielding various PPI-b-PF copolymers possessing controlled molar mass and narrow dispersity. Owing to the helical conformation of PPI segment and π-conjugated structure of PF segment, PPI-b-PF copolymers present distinctive optical property and fascinating chiral self-assembly behavior. During the self-assembly process, chirality transfer from helical PPI block to the supramolecular aggregates of helical nanofibers occurs to afford optically active helical nanofibers with high optical activity. Furthermore, the self-assembled helical nanofibers exhibit excellent circularly polarized luminescence performance.

中文翻译:

聚异氰苯基酯-嵌段聚芴共聚物的受控合成、手性组装和圆偏振发光

在这项工作中,通过苯基异氰化物(单体1)和7-溴-9,9-的一锅顺序聚合,轻松制备了由聚(苯基异氰化物)(PPI)和聚芴(PF)链段组成的π-共轭嵌段共聚物二辛基芴-2-硼酸频哪醇酯(单体2)。Pd(II)封端的PPI首先通过苯基炔-Pd(II)络合物催化聚合单体1制备,然后用于引发单体2的受控Suzuki交叉偶联聚合,产生具有以下性质的各种PPI-b-PF共聚物:控制摩尔质量和窄分散度。由于PPI链段的螺旋构象和PF链段的π共轭结构,PPI- b -PF共聚物呈现出独特的光学性质和令人着迷的手性自组装行为。在自组装过程中,发生从螺旋PPI块到螺旋纳米纤维的超分子聚集体的手性转移,从而提供具有高光学活性的光学活性螺旋纳米纤维。此外,自组装螺旋纳米纤维表现出优异的圆偏振发光性能。
更新日期:2023-05-09
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