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Organic films with a twist

机译:有机薄膜

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摘要

Left- and right-handed helical molecules form mirror-image chiral crystals on a copper substrate. It seems that the substrate and the molecules work in concert to determine the handedness of the crystal domains. Chirality is central to the building blocks of life, and to commercial chemical enterprises. Most amino acids, sugars and pharmaceuticals contain chiral carbon centres ― a carbon atom bonded to four different substituents in a tetrahedral geometry. Such chiral molecules exist in two mirror-image forms, like left and right human hands, that are called enan-tiomers. Our understanding of this peculiar property can be traced back to Louis Pasteur, who discovered that 'racemic acid' (a crystalline deposit formed on wine casks during fermentation) consisted of equal amounts of left- and right-handed crystals of sodium ammonium tartrate, which were easily distinguished as mirror images under an optical microscope. As they report in Angewandte Chemie International Edition, Fasel et al. have exploited the atomic-level imaging capabilities of the scanning tunnelling microscope (STM) to observe chirality directly at the molecular level, in enan-tiomorphic two-dimensional crystals of chiral molecules on a copper surface.
机译:左旋和右旋螺旋分子在铜基板上形成镜像手性晶体。似乎底物和分子协同工作以确定晶体域的旋向性。手性对于生活的组成部分以及商业化学企业至关重要。大多数氨基酸,糖和药物都含有手性碳中心,即一个碳原子与一个四面体几何形状的四个不同的取代基键合。这样的手性分子以两种镜像形式存在,就像左右手一样,被称为对映异构体。我们对这种特殊性质的理解可以追溯到路易斯·巴斯德(Louis Pasteur),他发现“外消旋酸”(发酵过程中在酒桶上形成的结晶沉积物)由等量的酒石酸铵铵左旋和右旋晶体组成,在光学显微镜下很容易区分为镜像。正如他们在Angewandte Chemie国际版中的报道一样,Fasel等人。已利用扫描隧道显微镜(STM)的原子级成像功能直接在分子水平上观察铜表面上手性分子对映体的二维晶体中的手性。

著录项

  • 来源
    《Nature》 |2003年第6967期|p.615-616|共2页
  • 作者

    Michael D. Ward;

  • 作者单位

    Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue, Minneapolis, Minnesota 55455-0132, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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