Phenylalanine‐based polyarylacetylenes as enantiomer‐differentiating alignment media
Phenylalanine‐based polyarylacetylenes as enantiomer‐differentiating alignment media
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DOI：
10.1002/mrc.3894
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发表时间：
2012-12
影响因子：
2
通讯作者：
Alexis Krupp;M. Reggelin
中科院分区：
文献类型：
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作者：
Alexis Krupp;M. Reggelin
介绍了苯丙氨酸基聚乙炔的溶致液晶相作为新的对映异构取向介质。基于溶剂（CDCl 3）的2 H-信号的四极分裂的不寻常的温度依赖性，可以识别具有不同取向性质的相的三种不同状态。这提供了在不改变样品的情况下测量多个比对数据集的机会。出乎意料的是，异松安非他明的对映异构体的取向的最大差异被发现在高温域的相。这甚至更令人惊讶，因为聚合物主链的螺旋结构似乎在高于约10°C的温度下分解，留下重复单元中氨基酸部分的立体中心作为对映体分化的唯一原因。版权所有© 2012约翰威利父子有限公司.
Lyotropic liquid crystalline phases of a phenylalanine‐based polyacetylene are introduced as new enantiodifferentiating alignment media. Based on the unusual temperature dependence of the quadrupolar splitting of the 2H‐signal of the solvent (CDCl3), three distinct states of the phase with different orientational properties can be identified. This offers the opportunity to measure multiple alignment data sets without changing the sample. Unexpectedly, the largest difference in the orientation of the enantiomers of isopinocampheol was found in the high temperature domain of the phase. This is even more astonishing because the helical structure of the polymer backbone seems to break down at temperatures above approximately 10°C, leaving the stereogenic centers of the amino acid moieties in the repeating units as the only reason for the enantiodifferentiation. Copyright © 2012 John Wiley & Sons, Ltd.