Synthesis and optical properties of π-conjugated polymers and oligomers bearing hexaphenylbenzene and tetraphenyl ethene units,Journal of Polymer Science

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Synthesis and optical properties of π-conjugated polymers and oligomers bearing hexaphenylbenzene and tetraphenyl ethene units
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2021-10-09 , DOI: 10.1002/pol.20210659
Isao Yamaguchi ₁ , Daiki Fukumoto ₁ , Aohan Wang ₁

Affiliation

π-Conjugated polymers (CPs) and oligomers (COs) bearing hexaphenylbenzene (HPB) and tetraphenyl ethene (TPE) units were synthesized by Sonogashira and Suzuki–Miyaura coupling reactions. The optical properties of the CPs and COs were investigated by UV–vis, photoluminescence (PL), and fluorescence lifetime (τ) measurements. The PL intensities of the solutions of the CPs and COs synthesized by Sonogashira coupling were reduced upon addition of poor solvent like water, which is attributed to aggregation-caused quenching. In contrast, the CP and COs bearing the TPE unit synthesized by Suzuki–Miyaura coupling exhibited aggregation-induced emission enhancement in solution. This difference in fluorescence behavior is discussed herein in terms of the molecular sizes, conformations in solution, and τ values of the CPs and COs.

中文翻译：

带有六苯基苯和四苯基乙烯单元的π共轭聚合物和低聚物的合成和光学性质

通过 Sonogashira 和 Suzuki-Miyaura 偶联反应合成了带有六苯基苯 (HPB) 和四苯基乙烯 (TPE) 单元的 π 共轭聚合物 (CPs) 和低聚物 (COs)。通过紫外-可见光、光致发光 (PL) 和荧光寿命 ( τ ) 测量研究了 CPs 和 COs 的光学性质。加入水等不良溶剂后，通过 Sonogashira 偶联合成的 CPs 和 COs 溶液的 PL 强度降低，这归因于聚集引起的猝灭。相比之下，通过 Suzuki-Miyaura 耦合合成的带有 TPE 单元的 CP 和 COs 在溶液中表现出聚集诱导的发射增强。本文根据分子大小、溶液中的构象和τ讨论了这种荧光行为的差异 CP 和 CO 的值。

更新日期：2021-12-15

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