Enantiospecific Adsorption and Decomposition of Cysteine Enantiomers on the Chiral Cu{421}ᴿ Surface
2019
Gladys, Michael J. | O’Donnell, Kane | Tadich, Anton | Yook, Hyunwoo | Han, Jeong Woo | Thomsen, Lars
A detailed understanding of the bonding and molecular geometry characteristics of amino acids on chiral surfaces is vital toward discovering new pathways in chiral chemistry. Saturated layers of d- and l-cysteine amino acids were chemisorbed onto a chiral Cu{421}ᴿ surface. Although very little difference was observed in the molecular orientation of the two enantiomers as observed with near-edge X-ray absorption fine structure, a large variation in the sulfur bond scission energy was measured using a high-resolution X-ray photoelectron spectroscopy thermal annealing sequence. As a result of this scission process, enantiomers of cysteine molecules completely dissociate into alaninate at temperatures separated by as much as 16 K or 0.06 eV which is one of the largest stereo effects observed on chiral metal surfaces.
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