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Published on: March 27, 2019
Chiral molecules adsorbed on a solid surface: Tartaric acid diastereomers and their surface explosion on Cu(111)
Alexandra Rieger1, Cédric Sax1, Tobias Bauert1
1Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland.
Abstract:
The adsorption of diastereoisomers of tartaric acid, namely, meso (R,S)-tartaric acid, (R,R)-tartaric acid, and the racemic mixture of (R,R) and (S,S) tartaric acid on the (111) surface of a copper single crystal has been studied by means of reflection-absorption IR Spectroscopy, X-ray photoelectron spectroscopy, low-energy electron diffraction, and thermal desorption spectroscopy. Two distinct adsorption modes are identified for all three adsorbate systems. All molecules undergo an identical thermally induced autocatalytic decomposition reaction above 510 K. The pure enantiomers show 2D chiral long-range ordered structures of opposite handedness.
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