Enantiospecific Adsorption and Decomposition of Cysteine Enantiomers on the Chiral Cu{421}R Surface
Enantiospecific Adsorption and Decomposition of Cysteine Enantiomers on the Chiral Cu{421}R Surface
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DOI：
10.1021/acs.jpcc.9b03373
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发表时间：
2019-08-29
影响因子：
3.7
通讯作者：
Thomsen, Lars
中科院分区：
文献类型：
--
作者：
Gladys, Michael J.;O'Donnell, Kane;Thomsen, Lars
深入了解氨基酸在手性表面上的成键和分子几何特征对于发现手性化学的新途径至关重要。将D-和L-半胱氨酸氨基酸的饱和层化学吸附到手性Cu{421}（R）表面上。虽然非常小的差异，观察到的两种对映异构体的分子取向与近边X-射线吸收精细结构，一个大的变化，在硫键断裂能测量使用高分辨率X-射线光电子能谱热退火序列。作为这种断裂过程的结果，半胱氨酸分子的对映异构体在分离多达16 K或0.06 eV的温度下完全解离成丙氨酸，这是在手性金属表面上观察到的最大立体效应之一。
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.