Chirality transfer by epitaxial mismatch in multi-layered homochiral molecular films
Chirality transfer by epitaxial mismatch in multi-layered homochiral molecular films
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多层同手性分子薄膜中外延失配的手性转移
DOI：
10.1016/j.colsurfa.2009.06.008
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
K. Ernst
中科院分区：
文献类型：
--
作者：
M. Parschau;U. Ellerbeck;K. Ernst
我们报道了手性从对映纯单层向薄膜的转移。七螺旋烯的纯对映体是一种螺旋形芳香分子，通过与金属模板的Cu（111）晶格具有相反的倾斜角度，形成有序的第一层结构，表现出对映性。下一层生长在上面的准外延，但有一个小的晶格失配。这导致通过扫描隧道显微镜观察到的波纹结构。这种失配沿两个吸附质晶格矢量不同，从而导致第一层的斜倾角转变为莫尔维尔图的表观倾斜角。从详细的结构模型讨论了这种手性转移的机理。
We report the transfer of chirality from enantiomorphous monolayer into thin films. The pure enantiomers of heptahelicene, a helically shaped aromatic molecule, form ordered first layer structures that exhibit enantiomorphism by having opposite tilt angles of the adsorbate lattice with respect to the Cu(111) lattice of the metal template. The next layers grow on top quasi-epitaxially, but with a small lattice mismatch. This leads to Moiré structures observed via scanning tunneling microscopy. The mismatch differs along the two adsorbate lattice vectors, thus causing a transfer of the oblique tilt angle in the first layer into an apparent tilt angle of the Moiré pattern. The mechanism of this chirality transfer in terms of a detailed structure model is discussed.