TTF-TCNE电荷转移复合物中近藤效应与受体分子构象的相关性
Correlation of Kondo effect and molecular conformation of the acceptor molecule in the TTF-TCNE charge transfer complex
摘要：
在金属表面上的电荷转移络合物的几种组合中，在纯有机分子上观察到了近藤共振。它被认为是一个电子从供体转移到受体LUMO的扩展$π$轨道的指纹。在这里，我们研究了四硫富瓦烯（TTF）和四氰基乙烯（TCNE）在Au（111）表面的化学计量棋盘结构，在4.8 K下使用扫描隧道和原子力显微镜。我们发现TCNE分子的一个双稳态具有不同的结构和电子性质。这两种状态代表TCNE在结构中的不同构象。其中一个表现出近藤共振，而另一个没有，尽管这两种TCNE类型是单电荷。
英文摘要：
A Kondo resonance has been observed on purely organic molecules in several combinations of charge transfer complexes on a metal surface. It has been regarded as a fingerprint of the transfer of one electron from the donor to the extended $π$ orbital of the acceptor's LUMO. Here, we investigate the stoichiometric checkerboard structure of tetrathiafulvalene (TTF) and tetracyanoethylene (TCNE) on a Au(111) surface using scanning tunneling and atomic force microscopy at 4.8 K. We find a bistable state of the TCNE molecules with distinct structural and electronic properties. The two states represent different conformations of the TCNE within the structure. One of them exhibits a Kondo resonance, whereas the other one does not, despite of both TCNE types being singly charged.
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