Guest-Induced Arylamide Polymer Helicity: Twist-Sense Bias and Solvent-Dependent Helicity Inversion
Guest-Induced Arylamide Polymer Helicity: Twist-Sense Bias and Solvent-Dependent Helicity Inversion
复制标题
客体诱导的芳酰胺聚合物螺旋度：扭转感应偏差和溶剂依赖性螺旋度反转
DOI：
10.1002/asia.201600289
复制
发表时间：
2016
影响因子：
4.1
通讯作者：
Li Zhan-Ting
中科院分区：
文献类型：
--
作者：
Zhang Peng;Zhang Liang;Wang Ze-Kun;Zhang Yun-Chang;Guo Rong;Wang Hui;Zhang Dan-Wei;Li Zhan-Ting
合成并表征了苯/萘交替掺入的酰胺聚合物。 1H NMR光谱、荧光和圆二色性（CD）实验表明，在氯仿中，该聚合物可以被手性天冬氨酸二价阴离子或其衍生物诱导形成具有扭转方向偏向的螺旋管状构象。 CD 滴定研究表明，l-天冬氨酸二价阴离子（8 当量）可以产生最大的 Cotton 效应。研究还表明，扭转方向服从多数规则，70％的对映体过量可以实现最大螺旋度偏差。将乙腈添加到氯仿溶液中导致聚合物的客体诱导螺旋性偏差反转。
A benzene/naphthalene alternately incorporated amide polymer was synthesized and characterized.1H NMR spectroscopy, fluorescence, and circular dichroism (CD) experiments indicated that, in chloroform, the polymer could be induced by the chirall‐aspartic acid dianion or one of its derivatives to form a helical tubular conformation with twist‐sense bias. CD titration studies showed that thel‐aspartic acid dianion (8 equiv.) could lead to a maximum Cotton effect. It was also revealed that the twist‐sense bias obeyed the majority rule, and 70 % enantiomeric excess could realize the maximum helicity bias. Adding acetonitrile to the solution of chloroform caused inversion of the guest‐induced helicity bias of the polymer.