在二维的enantiomorphous网格中,奇拉性的放大
Roman Fasel1, Manfred Parschau, Karl-Heinz Ernst
1Empa, Swiss Federal Laboratories for Materials Testing and Research, Uberlandstrasse 129, CH-8600 Dübendorf, Switzerland.
Nature
|January 27, 2006
概括
像乙烯这样的基质分子在表面上形成racemic域,而不是分离成纯反体. 一个小的反体过量可以放大这种情况,导致整个表面均的奇拉域.
科学领域:
- 表面科学是一门学科.
- 奇拉性研究 奇拉性研究
- 分子组合分子组合.
背景情况:
- 奇拉性,非叠加镜像的属性,是化学和生物学的基础.
- 结晶是分离性分子 (反体) 的关键,但预测结果仍然具有挑战性.
- 二维结晶为研究性相互作用和组装提供了一个更简单的模型.
研究的目的:
- 在Cu111表面上研究奇拉碳化合物heptahelicene的2D结晶行为.
- 确定乙烯是否在2D中经历自发的enantioseparation.
- 了解性相互作用和反体过量如何影响表面结构的形成.
主要方法:
- 使用扫描道显微镜 (STM) 直接观察表面结构的分子分辨率.
- 研究了Heptahelicene在Cu111表面上的吸附和自我组装.
- 分析了在中视尺度上的域形成和晶格结构.
主要成果:
- 乙烯在Cu111.1.上没有达到完全的2D分离.
- 观察到具有非叠加的镜像格子的 Racemic heptahelicene 域.
- 一个小的海普他利的反体过量足以放大反形态,导致 homochiral 域的形成.
结论:
- 即使在简化系统中,也不总能实现自发的2D enantioseparation.
- 介镜式的enantiomorphism和扩大由奇拉修饰者是显著的现象在表面的奇拉组装.
- 表面封闭和性相互作用在指导分子组织方面发挥着至关重要的作用.
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