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首页> 外文期刊>Chemistry: A European journal >Self-assembled ultralong chiral nanotubes and tuning of their chirality through the mixing of enantiomeric components
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Self-assembled ultralong chiral nanotubes and tuning of their chirality through the mixing of enantiomeric components

机译：自组装超长手性纳米管并通过对映体组分的混合对其手性进行调节

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摘要

Enantiomeric L- or D-glutamic acid based lipids were designed and their self-assembly was investigated. It was found that at a certain concentration, either L- or D-enantiomeric derivatives could self-assemble in absolute alcohol to form a white organogel, which was composed of ultralong nanotubes with an aspect ratio higher than 1000. Further investigations revealed that these nanotubes were in chiral forms. The chirality of the nanotubes was determined by that of the enantiomers employed. In addition, when D and L enantiomers were mixed in different ratios, the nanotube could be tuned consecutively from nanotubes with a helical seam to nanotwists, the chirality of which being determined by the excess enantiomer in the mixed systems. In the case of an equimolar mixture of the enantiomers, flat nanoplates instead of helical nanotubes or nanotwists were obtained. The FTIR vibrational data and XRD layer-distance values showed a consecutive change as a function of the enantiomeric excess. It was further revealed that the slightly stronger interaction between D-L enantiomeric pairs than that between D-D or L-L pairs was responsible for the formation of the diverse self-assembled nanostructures.
机译：设计了基于L-或D-谷氨酸的对映体脂质，并研究了它们的自组装。发现在一定浓度下，L-或D-对映体衍生物都可以在无水乙醇中自组装形成白色有机凝胶，该有机凝胶由纵横比大于1000的超长纳米管组成。进一步的研究表明，这些纳米管呈手性形式。纳米管的手性取决于所用对映异构体的手性。另外，当D和L对映异构体以不同比例混合时，纳米管可以连续地从具有螺旋接缝的纳米管调谐到纳米扭曲，其手性由混合体系中过量的对映异构体决定。在对映体的等摩尔混合物的情况下，获得了平坦的纳米板而不是螺旋纳米管或纳米扭曲。 FTIR振动数据和XRD层距值显示出连续变化，是对映体过量的函数。进一步揭示，D-L对映体对之间的相互作用比D-D或L-L对之间的相互作用稍强，这是形成各种自组装纳米结构的原因。

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