Chiral Conflict. The Effect of Temperature on the Helical Sense of a Polymer Controlled by the Competition between Structurally Different Enantiomers: From Dilute Solution to the Lyotropic Liquid Crystal State
作者:Kai Tang、Mark M. Green、Kap Soo Cheon、Jonathan V. Selinger、Bruce A. Garetz
DOI:10.1021/ja030065c
日期:2003.6.1
temperature, and also reveal unusual details of the nature of chiral interactions. Consistent with a statistical physical theory developed for these experiments, the proportion of the competing chiral groups, determined by synthesis, fixes the compensation temperature at which the helical senses are equally populated. The lyotropic liquid crystal state formed by these polymers yields therefore a nematic state
螺旋聚合物附加有成对的结构不同的对映异构体,它们具有相反的螺旋意义偏好,在光学活性和温度之间产生一种新的关系,并且还揭示了手性相互作用性质的不寻常细节。与为这些实验开发的统计物理理论一致,由合成确定的竞争手性基团的比例确定了螺旋感相等时的补偿温度。因此,由这些聚合物形成的溶致液晶态在非常宽的范围内的任何选定温度下产生向列态,随着温度偏离该点,胆甾醇态随着紧缩沥青而产生。远离向列温度,间距达到纳米级,因此可以反射可见光。