Light-Controlled Supramolecular Helicity of a Liquid Crystalline Phase Using a Helical Polymer Functionalized with a Single Chiroptical Molecular Switch
作者:Dirk Pijper、Mahthild G. M. Jongejan、Auke Meetsma、Ben L. Feringa
DOI:10.1021/ja711283c
日期:2008.4.1
attached at the polymer's terminus, has been accomplished in solution via a combination of photochemical and thermal isomerizations. Here, we report that after redesigning the photochromic unit to a chiroptical molecular switch, of which the two states are thermally stable but photochemically bistable, the chiral induction to the polymer's backbone is significantly improved and the handedness of the helical
通过使用共价连接在聚合物末端的单个光驱动分子马达,已通过光化学和热异构化的组合在溶液中实现了对聚(正己基异氰酸酯)(PHIC)的优选螺旋方向的控制。在这里,我们报告说,在将光致变色单元重新设计为手性分子开关后,其中两种状态是热稳定但光化学双稳态的,对聚合物主链的手性诱导显着改善,螺旋聚合物的旋向性可通过辐照来解决两种不同波长的光。此外,我们表明手性信息通过多异氰酸酯的大分子水平传递到由这些硬质、棒状聚合物。这使得液晶膜的超分子螺距的大小和符号完全由光控制。