Positional Isomerism-Mediated Copolymerization Realizing the Continuous Luminescence Color-Tuning of Liquid-Crystalline Polymers,Macromolecules

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Positional Isomerism-Mediated Copolymerization Realizing the Continuous Luminescence Color-Tuning of Liquid-Crystalline Polymers
Macromolecules ( IF 5.1 ) Pub Date : 2022-06-23 , DOI: 10.1021/acs.macromol.2c00458
Bin Mu ₁ , Zhelin Zhang ₁ , Xiangnan Hao ₁ , Tianshu Ma ₁ , Wei Tian ₁

Affiliation

Liquid crystals with color-tunable light emission are important for a variety of applications; however, achieving multicolor light-emitting liquid crystals whose emission colors can be fine-tuned remains challenging because the limited derivatization of mesogenic fluorophores disfavors the diversity of the emission. Here, we present a positional isomerism-mediated copolymerization strategy to obtain liquid-crystalline polymers with continuous luminescence color-tuning ability. The introduced α–/β-cyanostilbene positional isomers possess very similar molecular structures, thus reducing the risk of assembly heterogeneity and facilitating the formation of a homogeneous and consistent liquid crystal mesophase. Meanwhile, a significant electronic effect was caused for fluorophores with positional isomerization, allowing the efficient tuning of emission colors via copolymerization. Especially with a gradual change in the composition of the copolymers, the emission color shift behaved in a continuous manner from blue to green. These cyanostilbene-based liquid-crystalline polymers also showed reversible photochromic fluorescence switching ability. This approach highlights the value of positional isomers to prepare color-tunable solid-state light-emitting materials, allowing control and fine-tuning of the emission property while maintaining the ordered assembly ability.

中文翻译：

位置异构介导的共聚实现液晶聚合物的连续发光颜色调谐

具有颜色可调光发射的液晶对于各种应用都很重要。然而，实现发射颜色可以微调的多色发光液晶仍然具有挑战性，因为介晶荧光团的有限衍生不利于发射的多样性。在这里，我们提出了一种位置异构介导的共聚策略，以获得具有连续发光颜色调节能力的液晶聚合物。引入的α-/β-氰芪位置异构体具有非常相似的分子结构，从而降低了组装异质性的风险，并促进了均匀一致的液晶中间相的形成。同时，位置异构化的荧光团产生了显着的电子效应，允许通过共聚有效调整发射颜色。特别是随着共聚物组成的逐渐变化，发射色移表现为从蓝色到绿色的连续方式。这些基于氰基芪的液晶聚合物也显示出可逆的光致变色荧光切换能力。这种方法突出了位置异构体在制备颜色可调固态发光材料方面的价值，允许在保持有序组装能力的同时控制和微调发射特性。这些基于氰基芪的液晶聚合物也显示出可逆的光致变色荧光切换能力。这种方法突出了位置异构体在制备颜色可调固态发光材料方面的价值，允许在保持有序组装能力的同时控制和微调发射特性。这些基于氰基芪的液晶聚合物也显示出可逆的光致变色荧光切换能力。这种方法突出了位置异构体在制备颜色可调固态发光材料方面的价值，允许在保持有序组装能力的同时控制和微调发射特性。

更新日期：2022-06-23

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