Dr. Karl-Heinz Ernst Profile

Dr. Karl-Heinz Ernst

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Proceedings Article | 24 June 2002 Paper

Supramolecular chiral films

Karl-Heinz Ernst, Roman Fasel, Y. Kuster

Proceedings Volume 4806, (2002) https://doi.org/10.1117/12.472991

KEYWORDS: Molecules, Diffraction, Scanning tunneling microscopy, X-rays, Adsorption, Telescopic pixel displays, Metals, Chemical species, X-ray diffraction, Molecular interactions

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The self-assembly of racemic and enantiopure Heptahelicene, a helically shaped polyaromatic hydrocarbon (C30H18), on single-crystal surfaces was studied at temperatures between 150 K and 1000 K by means of surface sensitive methods like scanning tunneling microscopy (STM), temperature programmed desorption (TPD), low-energy electron diffraction (LEED), time-of-flight secondary mass spectrometry (ToF-SIMS), X-ray photoelectron spectroscopy and diffraction (XPS, XPD), and Auger electron spectroscopy (AES). On Ni(111), Ni(100) and Cu(111), the molecule remains intact up to 450 K. Above that temperature it decomposes in several steps into carbon and hydrogen, the latter desorbing subsequently as H2. The adsorption of racemic Heptahelicene on Cu(111) leads to a two-dimensional enantiomeric separation into at least 20 nm wide homochiral domains. In the first monolayer, the adsorbate-substrate complex has a geometry in which the molecule is oriented with three terminal rings parallel to the surface. After adsorption of enantiopure Heptahelicene onto the stepped Cu(332) surface, an azimuthal alignment of the molecular spirals is observed, creating a single-phase orientational order. X-ray absorption studies (NEXAFS) using synchrotron radiation show for the molecule in the saturated monolayer on Ni(100) a tilted geometry.

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