Differences in two-dimensional crystal structures: Racemic and enantiopure heptahelicene on Cu(111)
Differences in two-dimensional crystal structures: Racemic and enantiopure heptahelicene on Cu(111)
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二维晶体结构的差异：Cu(111) 上的外消旋和对映体纯七螺旋烯
DOI：
10.1380/ejssnt.2004.136
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发表时间：
2004
影响因子：
0.7
通讯作者：
R. Fasel
中科院分区：
文献类型：
--
作者：
K. Ernst;M. Parschau;R. Fasel
用低能电子衍射(LEED)和扫描隧道显微镜(STM)研究了低温下手性烃七螺烯在铜(111)面上的吸附。纯对映体形成扩展的手性结构，它们是彼此的镜像，在外消旋混合物吸附后观察到镜像域。虽然吸附晶格相对于底物晶格的周期和取向几乎相同，但从LEED的结论来看，STM对外消旋混合物和纯对映体显示了不同的局域结构。这可以用吸附晶格内分子的不同相对方位取向以外的所有结构中的准六方二维堆积来解释。[doi：10.1380/ejssnt.2004.136]
Adsorption of the chiral hydrocarbon heptahelicene on Cu(111) has been investigated by means of low energy electron diffraction (LEED) and scanning tunneling microscopy (STM) at cryogenic temperatures. The pure enantiomers form extended chiral structures which are mirror images of each other and mirror domains are observed after adsorption of the racemic mixture. Although periodicity and orientation of the adsorbate lattices with respect to the substrate lattice are almost identical, as concluded from LEED, STM reveals different local structures for racemic mixture and pure enantiomers. This is explained by quasi-hexagonal two-dimensional packing in all structures but different relative azimuthal orientations of the molecules within the adsorbate lattice. [DOI: 10.1380/ejssnt.2004.136]