Helix Magic. Thermo-Driven Chiroptical Switching and Screw-Sense Inversion of Flexible Rod Helical Polysilylenes
作者:Michiya Fujiki
DOI:10.1021/ja9938581
日期:2000.4.1
and screw-pitch, were to be characterized quantitatively by spectroscopically analyzing circular dichroism (CD) and UV absorption characteristics. This is based on the unique property of the rodlike polymer in which the CD band completely matches the corresponding UV band profile at all temperatures. Moreover, fine controlling the contents and chirality of an additional chiral silylene unit incorporated
一种理想的光学活性螺旋发色聚合物,包含柔性棒状硅主链和对映纯烷基侧链,聚(S)-3,7-二甲基辛基-3-甲基丁基亚硅烷},在-20°经历热驱动螺旋-螺旋转变C 在异辛烷中。通过光谱分析圆二色性 (CD) 和紫外吸收特性,可以定量表征转变特征,包括转变温度、转变宽度、右手和左手螺旋图案的数量、全局形状和螺距。这是基于棒状聚合物的独特性质,其中 CD 波段在所有温度下都与相应的 UV 波段轮廓完全匹配。而且,精细控制掺入共聚物中的额外手性亚硅烷单元的含量和手性允许在 -64 至 +79 °C 范围内自由控制转变温度。分子力学计算表明势能曲线存在显着差异...