Temperature Dependence of Helical Structures of Poly(phenylacetylene) Derivatives Bearing an Optically Active Substituent
作者:Kazuhide Morino、Katsuhiro Maeda、Yoshio Okamoto、Eiji Yashima、Takahiro Sato
DOI:10.1002/1521-3765(20021115)8:22<5112::aid-chem5112>3.0.co;2-s
日期:2002.11.15
phenylacetylene derivatives bearing an optically active substituent, such as the (R)-((1-phenylethyl)carbamoyl)oxy and (R)-((1-(1-naphthyl)ethyl)carbamoyl)oxy groups at the phenyl group, and their copolymers with achiral phenylacetylenes were investigated in solution using circular dichroism (CD) and absorption spectroscopies. The magnitude of the induced CD (ICD) of the optically active homopolymers increased
带有光学活性取代基的苯基乙炔衍生物的均聚物,如(R)-((1-苯基乙基)氨基甲酰基)氧基和(R)-((1-(1-(萘基))乙基)螺旋结构的温度依赖性溶液中使用圆二色性(CD)和吸收光谱研究了苯基上的)(氨基甲酰基)氧基及其与非手性苯基乙炔的共聚物。旋光均聚物的诱导CD(ICD)的大小随温度降低而增加,并伴随其最大吸收量的蓝移。另一方面,取决于非手性共聚单体的体积,具有非手性苯基乙炔的共聚物显示出有趣的ICD随温度的变化。具有较小体积的苯乙炔的共聚物在低温下具有非常强的ICD,ICD图谱几乎与手性均聚物相反,而在对位上带有最大体积的苯基乙炔的叔丁基二苯基甲硅烷氧基的共聚物则显示出与旋光均聚物相似的ICD变化。然而,具有在对位上具有中间膨松度的带有叔丁基二甲基甲硅烷氧基的苯基乙炔的共聚物没有显示出ICD随温度的变化。这些结果表明,苯乙炔的手性-非手性无规共聚物的主要螺旋感是由手性和非手性侧链之