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Polyfluorene-block-poly(phenyl isocyanide) Copolymers: One-Pot Synthesis, Helical Assembly, and Circularly Polarized Luminescence
Macromolecules ( IF 5.1 ) Pub Date : 2023-02-28 , DOI: 10.1021/acs.macromol.2c01943 Hui Zou 1 , Wei Liu 1 , Chao Wang 1 , Li Zhou 1 , Na Liu 2 , Zong-Quan Wu 3
Macromolecules ( IF 5.1 ) Pub Date : 2023-02-28 , DOI: 10.1021/acs.macromol.2c01943 Hui Zou 1 , Wei Liu 1 , Chao Wang 1 , Li Zhou 1 , Na Liu 2 , Zong-Quan Wu 3
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Optically active π-conjugated block copolymers are of considerable significance and interest, but their controlled synthesis and helical self-assembly remain challenging. In this study, π-conjugated block copolymers consisting of polyfluorene (PF) and poly(phenyl isocyanide) (PPI) segments were facilely prepared in one pot through two sequential polymerizations. First, a Pd(II)-terminated PF precursor was synthesized via the Suzuki cross-coupling polymerization of 7-bromo-9,9-dihexylfluorene-2-boronic acid pinacol ester, which was catalyzed using a Pd(0)/t-Bu3P system. Then, PF-b-PPI copolymers with controlled molar mass and narrow dispersities were fabricated via controlled polymerization of phenyl isocyanide monomers utilizing Pd(II)-terminated PF as the catalyst. Benefiting from the π-conjugated structure of the PF block and the helicity of the PPI block, the resulting PF-b-PPI copolymers could self-assemble into single-handed helical nanofibers. In the self-assembly process, chirality was transferred from the helical PPI block to the self-assembled helical nanofibers, thereby endowing them with optical activity and excellent circularly polarized luminescence properties.
中文翻译：
聚芴嵌段聚（苯基异氰化物）共聚物：一锅法合成、螺旋组装和圆偏振发光
光学活性 π 共轭嵌段共聚物具有相当大的意义和兴趣，但它们的可控合成和螺旋自组装仍然具有挑战性。在这项研究中，通过两次顺序聚合，在一个锅中轻松制备了由聚芴 (PF) 和聚（苯基异氰化物）(PPI) 链段组成的 π 共轭嵌段共聚物。首先，通过使用 Pd(0)/ t - Bu 3P系统。那么，PF- b- 具有受控摩尔质量和窄分散性的 PPI 共聚物是通过使用 Pd(II)-封端 PF 作为催化剂的苯基异氰化物单体的受控聚合制备的。得益于 PF 嵌段的 π 共轭结构和 PPI 嵌段的螺旋性，所得 PF- b -PPI 共聚物可以自组装成单手螺旋纳米纤维。在自组装过程中，手性从螺旋PPI块转移到自组装的螺旋纳米纤维上，从而赋予它们光学活性和优异的圆偏振发光性能。
更新日期：2023-02-28
中文翻译：
聚芴嵌段聚（苯基异氰化物）共聚物：一锅法合成、螺旋组装和圆偏振发光
光学活性 π 共轭嵌段共聚物具有相当大的意义和兴趣，但它们的可控合成和螺旋自组装仍然具有挑战性。在这项研究中，通过两次顺序聚合，在一个锅中轻松制备了由聚芴 (PF) 和聚（苯基异氰化物）(PPI) 链段组成的 π 共轭嵌段共聚物。首先，通过使用 Pd(0)/ t - Bu 3P系统。那么，PF- b- 具有受控摩尔质量和窄分散性的 PPI 共聚物是通过使用 Pd(II)-封端 PF 作为催化剂的苯基异氰化物单体的受控聚合制备的。得益于 PF 嵌段的 π 共轭结构和 PPI 嵌段的螺旋性，所得 PF- b -PPI 共聚物可以自组装成单手螺旋纳米纤维。在自组装过程中，手性从螺旋PPI块转移到自组装的螺旋纳米纤维上，从而赋予它们光学活性和优异的圆偏振发光性能。
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