Chiral binaphthyl derivatives having two photochromic diarylethene units were synthesized in an attempt to use them as dopants for photoresponsive liquid crystals. These compounds showed thermally irreversible photochromic reactions. The circular dichroism (CD) spectra and the optical rotation values of the derivatives reversibly changed in methanol upon alternate irradiation with ultraviolet and visible light. Large photostimulated pitch changes of chiral nematic K-15 liquid crystals were observed on addition of the derivatives as dopants. The relation between the optical rotation and the twisting power force was discussed.
为了将手性二
萘衍
生物用作光致变性液晶的掺杂剂,我们合成了具有两个光致变性二元
乙烯单元的手性二
萘衍
生物。这些化合物显示出热不可逆的光致变色反应。在
甲醇中,当紫外线和可见光交替照射时,衍
生物的圆二色性(CD)光谱和旋光度值会发生可逆变化。在加入这些衍
生物作为掺杂剂后,观察到手性向列 K-15 液晶在光刺激下发生了很大的螺距变化。讨论了光学旋转与扭转力之间的关系。