题目：Nonplanar aromatic molecules at surfaces: self-assembly, spin filtering and molecular motors

　　报告人：Prof. Dr. Karl-Heinz Ernst（Empa, Swiss Federal Laboratories for Materials Science and Technology, Switzerland）

　　时  间：2017年7月10日(周一)上午10:00

　　地  点：best365注册 中心教学楼610

　　Abstract:

　　Molecular recognition among chiral molecules on surfaces is of paramount importance in biomineralization, enantioselective heterogeneous catalysis, and for the separation of chiral molecules into their two mirror-image isomers (enantiomers) via crystallization or chromatography. Understanding the principles of molecular recognition in general, however, is a difficult task and calls for investigation of appropriate model systems. One popular approach is thereby studying intermolecular interactions on well-defined solid surfaces, which allows in particular the use of scanning tunneling microscopy (STM). Examples of chiral amplification via the so-called ‘sergeant-and-soldiers’ effect as well as manipulation of chiral adsorbates via inelastic electron tunneling will be presented. In a Pasteur-type experiment at the nanoscale, molecules that constitute a dimer are spatially separated with a molecular STM tip and their absolute handedness is determined with submolecular resolution STM. Moreover, we report spin-dependent filtering of electrons by monolayers of these helical molecules. Finally the first successful electrical current- driven, unidirectional motion of a synthetic molecule will be presented.

　　简历：

　　Karl-Heinz Ernst，瑞士联邦材料科学与技术实验室高级科学家，苏黎世大学教授。1990年德国柏林自由大学获博士学位，1992年加入瑞士联邦材料科学与技术实验室。曾为美国华盛顿大学、德国柏林自由大学、美国IBM实验室（Almaden
）访问学者。 长期从事有机功能分子在固体表面的自组装结构和物性调控研究，在手性识别和分离、有机纳米机器等方面取得了一系列创造性成果，其有机纳米马达相关成果曾被2016年诺贝尔化学奖评审委员会在公布获奖人名单时提及。在Nature、Nature chemistry、PRL、JACS、Angew. Chem.、NanoLett.等期刊发表论文130多篇，他引3500多次，h-index为35。在国际学术会议上作邀请报告200多次。先后担任CHIMIA 
、Surface Science 
、Helvetica Chimica Acta 等学术期刊编委，并曾多次组织和主持国际学术会议。

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　　邀请人：肖文德 副教授

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