Chain helicity of a poly(phenylacetylene) with chiral centers between backbone and mesogenic groups on side chains

Chain helicity of a poly(phenylacetylene) with chiral centers between backbone and mesogenic groups on side chains
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主链和侧链介晶基团之间具有手性中心的聚苯乙炔的链螺旋度

DOI:
10.1016/j.polymer.2008.06.007
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发表时间:
2008-07
期刊:
影响因子:
4.6
通讯作者:
--
中科院分区:
化学2区
文献类型:
--
作者:

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采用[Rh(nbd)Cl]2催化剂,高产率合成了高产率、高分子量(1.3×106g/mol)的光学活性聚(苯乙炔)聚{2-(R)-甲基-2-[4'-(十四烷氧基)联苯-4-基氧基]丙基4-乙炔基苯甲酸酯}(P1)。通过IR和NMR光谱对聚合物的化学结构进行了表征,并得到了满意的分析数据。该聚合物可溶于许多常见的有机溶剂。它在聚乙炔主链的吸收区域显示圆二色性(CD)带,表明P1由于形成具有过量螺旋方向的螺旋构象而具有手性。结合圆二色实验和光散射实验的结果,我们发现不良溶剂的添加可以导致单条聚合物链内的相邻螺旋段变得更接近,从而在聚合物沉淀之前导致激子耦合。溶剂蒸发后,激子耦合可以保持固态。
An optically active poly(phenylacetylene), poly{2-(R)-methyl-2-[4′-(tetradecyloxy)biphenyl-4-yloxy]propyl 4-ethynylbenzoate} (P1) is synthesized in a high yield with a high molecular weight (1.3×106g/mol) by [Rh(nbd)Cl]2catalyst. The chemical structure of the polymer is characterized by IR and NMR spectroscopies with satisfactory analysis data. The polymer is soluble in many common organic solvents. It shows circular dichroism (CD) band in the absorption region of the polyacetylene backbone, indicating that P1 is chiroptical owing to the formation of helical conformation with an excess screw sense. Combining the results of CD and light scattering experiments, we find that addition of poor solvent can induce the neighboring helical segments within a single polymer strand to become closer, resulting in exciton coupling prior to polymer precipitation. The exciton coupling can be kept in the solid state after solvent evaporation.
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