کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
595628 | 1454018 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chirality transfer by epitaxial mismatch in multi-layered homochiral molecular films
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
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(1Â 1Â 1) 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 354, Issues 1â3, 5 February 2010, Pages 240-245
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 354, Issues 1â3, 5 February 2010, Pages 240-245
نویسندگان
Manfred Parschau, Ursula Ellerbeck, Karl-Heinz Ernst,