Nonracemic dopant-mediated hierarchical amplification of macromolecular helicity in a charged polyacetylene leading to a cholesteric liquid crystal in water.
Nonracemic dopant-mediated hierarchical amplification of macromolecular helicity in a charged polyacetylene leading to a cholesteric liquid crystal in water.
复制标题
DOI：
10.1021/ja044264n
复制
发表时间：
2004-11
影响因子：
15
通讯作者：
Katsuhiro Maeda;Yoshihisa Takeyama;Koichi Sakajiri;E. Yashima
中科院分区：
文献类型：
--
作者：
Katsuhiro Maeda;Yoshihisa Takeyama;Koichi Sakajiri;E. Yashima
在这里，我们展示了螺旋聚乙炔的第一个例子，它通过水中大分子螺旋过程的分级放大形成溶致液晶（LC）。带正电荷的聚乙炔通过水中的静电相互作用与极小的带相反电荷的非外消旋掺杂剂络合后，首先在带正电荷的聚乙炔中诱导出具有过量单螺旋方向的大分子螺旋性。随后，通过自组装成溶致胆甾状态的超分子螺旋阵列，聚合物主链中的螺旋度显着放大，成为几乎完美的单手螺旋。目前的结果将允许检测手性分子的微小不平衡，并为生物技术和材料科学等领域的新型水溶性螺旋结构的设计和新型手性材料的构建提供新方法。
Here we show the first example of a helical polyacetylene that forms a lyotropic liquid crystal (LC) through a hierarchical amplification of a macromolecular helicity process in water. The macromolecular helicity with an excess of one helical sense was first induced in the positively charged polyacetylene upon complexation with an extremely small oppositely charged nonracemic dopant through electrostatic interaction in water. Subsequently, the helicity was significantly amplified in the polymer backbone as an almost perfect single-handed helix through self-assembly into supramolecular helical arrays in a lyotropic cholesteric state. The present results will allow the detection of a tiny imbalance in chiral molecules and also provide new approaches for the design of novel water-soluble helical architectures and the construction of new chiral materials in areas such as biotechnology and materials science.