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Chiral polyfluorene derivatives: Synthesis, chiroptical properties, and investigation of the structure-property relationships

机译：手性聚芴衍生物：合成，手性和结构性质关系的研究

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摘要

Four polyfluorene derivatives with chiral center in the backbone or at the side chain, PLPheF ( P1), PLPhGlyF ( P2), PDPheF ( P3), and PSPF ( P4), have been designed and synthesized through the Pd-catalyzed Suzuki polymerization. The structures of these polymers are characterized by H-1 and C-13 NMR, UV-vis, photoluminescence ( PL), and CD spectroscopic methods as well as elemental analysis. These four polymers exhibit the linearly polarized photoluminescence in dilute solutions. The investigation of the absorption and emission behaviors indicates that the aggregates and/or the excited states excimers might be formed in THF solution at higher concentrations. We also observe the emission dichroic ratio R-PL of these polymers in films is increased in comparison with that in solutions. After film annealing, polymers P1, P2, and P3 also show obvious linearly polarized photoluminescence at 500-650 nm. Moreover, the films of polymer P4 exhibit good thermal spectral stability after annealing in comparison with other three polymers P1, P2, and P3. We also report the circular dichroism ( CD) spectroscopic properties of these four polymers in THF solutions.
机译：通过Pd催化的Suzuki聚合反应设计并合成了四种在主链或侧链上具有手性中心的聚芴衍生物PLPheF（P1），PLPhGlyF（P2），PDPheF（P3）和PSPF（P4）。这些聚合物的结构通过H-1和C-13 NMR，UV-vis，光致发光（PL）和CD光谱法以及元素分析来表征。这四种聚合物在稀溶液中显示出线性偏振光致发光。对吸收和发射行为的研究表明，聚集体和/或激发态准分子可能在更高浓度的THF溶液中形成。我们还观察到，与溶液相比，这些聚合物在薄膜中的发射二向色比R-PL有所增加。薄膜退火后，聚合物P1，P2和P3在500-650 nm处也显示出明显的线性偏振光致发光。此外，与其他三种聚合物P1，P2和P3相比，聚合物P4的膜在退火之后表现出良好的热光谱稳定性。我们还报告了这四种聚合物在THF溶液中的圆二色性（CD）光谱特性。

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