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J Am Chem Soc. 2006 Feb 1;128(4):1076-7.

Enantiospecific adsorption of cysteine at chiral kink sites on Au(110)-(1 x 2).

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  • 1Interdisciplinary Nanoscience Center (iNANO), and Department of Physics and Astronomy, University of Aarhus, Denmark.


Enantiospecific adsorption of cysteine molecules onto chiral kink sites on the Au(110)-(1x2) surface was observed by scanning tunneling microscopy. l- and d-cysteine dimers were found to adopt distinctly different adsorption geometries at S kinks, which can be understood from the need to reach specific, optimum molecule-substrate interaction points. Extended, homochiral domains of l/d-cysteine were furthermore observed to grow preferentially from R/S kinks. The results constitute the first direct, microscopic observation of enantiospecific molecular interaction with chiral sites on a metal single-crystal surface.

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