Jump to main content
Jump to site search


Adsorption differences between low coverage enantiomers of alanine on the chiral Cu{421}R surface

Author affiliations

Abstract

Chiral separation using heterogeneous methods has long been sought after. Chiral metal surfaces have the potential to make it possible to model these systems using small amino acids, the building blocks for proteins. A comparison of submonolayer concentrations of alanine enantiomers adsorbed onto Cu{421}R has revealed a large geometrical differences between the two molecules as compared to the saturated coverage. Large differences were observed in HR-XPS and NEXAFS and complemented by theoretical DFT calculations. At approximately one third of a monolayer a comparison of the C1s XPS signal showed a shift in the methyl group of more than 300 meV indicating that the two enantiomers are in different chemical environments. NEXAFS spectroscopy confirmed the XPS variations and showed large differences in the orientation of the adsorbed molecules. Our DFT results show that the L-enantiomer is energetically the most stable in the {311} microfacet configuration. In contrast to the full monolayer coverage, these lower coverages showed enhanced selectivity.

Graphical abstract: Adsorption differences between low coverage enantiomers of alanine on the chiral Cu{421}R surface

Back to tab navigation
Please wait while Download options loads

Publication details

The article was received on 22 Mar 2017, accepted on 09 May 2017 and first published on 11 May 2017


Article type: Paper
DOI: 10.1039/C7CP01844D
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
  •   Request permissions

    Adsorption differences between low coverage enantiomers of alanine on the chiral Cu{421}R surface

    M. J. Gladys, J. W. Han, T. S. Pedersen, A. Tadich, K. M. O’Donnell and L. Thomsen, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP01844D

Search articles by author