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The adsorption geometry and chemical state of lysine on Cu{110}

Eralp, T., Shavorskiy, A. and Held, G. (2011) The adsorption geometry and chemical state of lysine on Cu{110}. Surface Science, 605 (3-4). pp. 468-472. ISSN 0039-6028

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To link to this item DOI: 10.1016/j.susc.2010.12.001


Chemisorbed layers of lysine adsorbed on Cu{110} have been studied using X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. XPS indicates that the majority (70%) of the molecules in the saturated layer at room temperature (coverage 0.27 ML) are in their zwitterionic state with no preferential molecular orientation. After annealing to 420 K a less densely packed layer is formed (0.14 ML), which shows a strong angular dependence in the characteristic π-resonance of oxygen K edge NEXAFS and no indication of zwitterions in XPS. These experimental results are best compatible with molecules bound to the substrate through the oxygen atoms of the (deprotonated) carboxylate group and the two amino groups involving Cu atoms in three different close packed rows. This μ4 bonding arrangement with an additional bond through the !-amino group is different from geometries previously suggested for lysine on Cu{110}.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:18110
Uncontrolled Keywords:Lysine (amino acids); Copper; NEXAFS; XPS; Racemic Alanine Adlayers; Chiral Cu(531) Surface; Local-Structure; Amino-Acid; Glycine; Cu(001); Enantiopure; Molecules; Cu(100); Rairs

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