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Creation of aromatic-type optically active conducting polymers by using liquid crystalline reaction field.

利用液晶反应场制备芳香族光学活性导电聚合物。

基本信息

批准号：
16550106
负责人：
GOTO Hiromasa
金额：
$ 2.43万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

We constructed liquid crystalline reaction field by using chiral nematic liquid crystals. And achiral thiophene monomer was polymerized in this reaction field. The polymer thus obtained showed chiral aggregation behavior, and the polymer exhibited optically active properties in spite of the polymer having no chiral substituent. Through this result, this polymerization technique can be concluded as new asymmetric polymerization method, and we developed "liquid crystal asymmetric polymerization method".Optically active polybithiophene was successfully prepared by electrochemical polymerization in a chiral nematic liquid crystal field. Polarizing and phase-contrast optical micrographs of the polymer revealed a well-resolved spiral morphology similar to the optical texture of the chiral nematic phase. Circular dichroism measurements indicated the Cotton effect for the film. The polymer exhibited optically active electrochromism and switching behavior.The polymer was demonstrated to replicate the spiral morphology of chiral nematic liquid crystal used as a solvent in electrochemical polymerization, affording an optically active conjugated polymer exhibiting optically active electrochromism. The proposed synthesis method provides new possibilities for chiral engineering, allowing for the synthesis of a range of conjugated polymers with chiroptical properties and extending the applications of such polymers in bioscience and engineering. This study also highlights the importance and versatility of chiral reaction fields for chemical synthesis.

利用手性双折射液晶构建了液晶反应场。并在此反应场中进行了非手性噻吩单体的聚合。由此获得的聚合物表现出手性聚集行为，并且尽管聚合物不具有手性取代基，但聚合物表现出光学活性。通过以上研究结果，我们认为该聚合技术是一种新的不对称聚合方法，并发展了“液晶不对称聚合法”，成功地在手性液晶场中通过电化学聚合制备了光学活性聚联噻吩。聚合物的偏振和相衬光学显微照片显示了一个很好的解决螺旋形态类似的光学纹理的手性双相。圆二色性测量表明膜的棉花效应。该聚合物具有光学活性电致变色和开关行为，在电化学聚合过程中，该聚合物复制了手性液晶的螺旋结构，得到了一种具有光学活性电致变色的光学活性共轭聚合物。所提出的合成方法为手性工程提供了新的可能性，允许合成一系列具有手性性质的共轭聚合物，并扩展此类聚合物在生物科学和工程中的应用。本研究也强调了手性反应场在化学合成中的重要性和通用性。