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首页> 外文期刊>Chemistry: A European journal >Chiral amplification in macromolecular helicity assisted by noncovalent interaction with achiral amines and memory of the helical chirality
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Chiral amplification in macromolecular helicity assisted by noncovalent interaction with achiral amines and memory of the helical chirality

机译：通过与非手性胺的非共价相互作用和螺旋手性的记忆辅助大分子螺旋中的手性扩增

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摘要

Poly [(4-carboxyphenyl) acetylene](poly-1) exhibits an intense induced circular dichroism (ICD) in the UV-visible region upon complexation with excess (R)-1-(1-naphthyl)ethylamine ((R)-2), owing to the formation of a predominantly single-handed helical conformation of the polymer backbone. In the presence of a small amount of (R)-2. poly-1 showed a very weak ICD due to the lack of a single-handed helical conformation. However, we have found that the co-addition of the excess bulky, achiral 1-naphthylmethylamine (5) with a small amount of (R)-2 caused a dramatic increase in the ICD magnitude, comparable to the full ICD induced by excess (R)-2. This indicates that an almost single-handed helix can be induced on poly-1 upon complexation with a small amount of (R)-2 assisted by achiral 5. Furthermore, the induced single-handed helical poly-1 could be successfully memorized by the replacement of (R)-2 and 5 with achiral 2-aminoethanol or n-butylamine.
机译：聚[（4-羧基苯基）乙炔]（poly-1）与过量的（R）-1-（1-萘基）乙胺（（R）-）络合后，在UV可见光区域表现出强烈的诱导二向色性（ICD）。 2），由于形成了聚合物骨架的主要单手螺旋构象。在少量（R）-2的存在下。由于缺乏单手螺旋构象，poly-1的ICD非常弱。但是，我们发现过量的笨重，非手性的1-萘甲胺（5）与少量的（R）-2的共同添加导致了ICD量的急剧增加，与过量（-）引起的完整ICD相当。 R）-2。这表明在与非手性5辅助的少量（R）-2络合后，poly-1上几乎可以诱导单手螺旋。此外，诱导的单手螺旋poly-1可以通过记忆成功地被记忆。用非手性2-氨基乙醇或正丁胺替代（R）-2和5。

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