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Effect of Stereochemistry on Chirality and Gelation Properties of Supramolecular Self‐Assemblies
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-11-22 , DOI: 10.1002/chem.202004533 Minggao Qin 1 , Yaqian Zhang 1 , Chao Xing 1 , Li Yang 1 , Changli Zhao 1 , Xiaoqiu Dou 1 , Chuanliang Feng 1
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-11-22 , DOI: 10.1002/chem.202004533 Minggao Qin 1 , Yaqian Zhang 1 , Chao Xing 1 , Li Yang 1 , Changli Zhao 1 , Xiaoqiu Dou 1 , Chuanliang Feng 1
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Although chiral nanostructures have been fabricated at various structural levels, the transfer and amplification of chirality from molecules to supramolecular self‐assemblies are still puzzling, especially for heterochiral molecules. Herein, four series of C2‐symmetrical dipeptide‐based derivatives bearing various amino acid sequences and different chiralities are designed and synthesized. The transcription and amplification of molecular chirality to supramolecular assemblies are achieved. The results show that supramolecular chirality is only determined by the amino acid adjacent to the benzene core, irrespective of the absolute configuration of the C‐terminal amino acid. In addition, molecular chirality also has a significant influence on the gelation behavior. For the diphenylalanine‐based gelators, the homochiral gelators can be gelled through a conventional heating–cooling process, whereas heterochiral gelators form translucent stable gels under sonication. The racemic gels possess higher mechanical properties than those of the pure enantiomers. All of these results contribute to an increasing knowledge over control of the generation of specific chiral supramolecular structures and the development of new optimized strategies to achieve functional supramolecular organogels through heterochiral and racemic systems.
中文翻译：
立体化学对超分子自组装的手性和凝胶化性质的影响
尽管已经在各种结构水平上制备了手性纳米结构，但是手性从分子到超分子自组装的转移和扩增仍然令人费解，特别是对于杂手性分子而言。在此，C 2的四个系列设计并合成了具有各种氨基酸序列和不同手性的基于对称二肽的衍生物。实现了分子手性向超分子组装体的转录和扩增。结果表明，超分子手性仅由与苯核心相邻的氨基酸决定，而与C端氨基酸的绝对构型无关。另外，分子手性也对胶凝行为具有重要影响。对于基于二苯丙氨酸的胶凝剂，同手性胶凝剂可以通过常规的加热-冷却过程进行胶凝，而异手性胶凝剂在超声处理下形成半透明的稳定凝胶。外消旋凝胶比纯对映异构体具有更高的机械性能。
更新日期：2020-11-22
中文翻译：
立体化学对超分子自组装的手性和凝胶化性质的影响
尽管已经在各种结构水平上制备了手性纳米结构，但是手性从分子到超分子自组装的转移和扩增仍然令人费解，特别是对于杂手性分子而言。在此，C 2的四个系列设计并合成了具有各种氨基酸序列和不同手性的基于对称二肽的衍生物。实现了分子手性向超分子组装体的转录和扩增。结果表明，超分子手性仅由与苯核心相邻的氨基酸决定，而与C端氨基酸的绝对构型无关。另外，分子手性也对胶凝行为具有重要影响。对于基于二苯丙氨酸的胶凝剂，同手性胶凝剂可以通过常规的加热-冷却过程进行胶凝，而异手性胶凝剂在超声处理下形成半透明的稳定凝胶。外消旋凝胶比纯对映异构体具有更高的机械性能。
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