Conformational Adaptation and Selective Adatom Capturing of Tetrapyridyl-porphyrin Molecules on a Copper (111) Surface
详细信息 查看全文
- 作者：Willi Auwä ; rter ; Florian Klappenberger ; Alexander Weber-Bargioni ; Agustin Schiffrin ; Thomas Strunskus ; Christof Wö ; ll ; Yan Pennec ; Andreas Riemann ; Johannes V. Barth
- 刊名：Journal of the American Chemical Society
- 出版年：2007
- 出版时间：September 12, 2007
- 年：2007
- 卷：129
- 期：36
- 页码：11279 - 11285
- 全文大小：560K
- 年卷期：v.129,no.36(September 12, 2007)
- ISSN：1520-5126
文摘
We present a combined low-temperature scanning tunneling microscopy and near-edge X-rayadsorption fine structure study on the interaction of tetrapyridyl-porphyrin (TPyP) molecules with a Cu(111) surface. A novel approach using data from complementary experimental techniques and charge densitycalculations allows us to determine the adsorption geometry of TPyP on Cu(111). The molecules arecentered on "bridge" sites of the substrate lattice and exhibit a strong deformation involving a saddle-shaped macrocycle distortion as well as considerable rotation and tilting of the meso-substituents. Wepropose a bonding mechanism based on the pyridyl-surface interaction, which mediates the moleculardeformation upon adsorption. Accordingly, a functionalization by pyridyl groups opens up pathways to controlthe anchoring of large organic molecules on metal surfaces and tune their conformational state. Furthermore,we demonstrate that the affinity of the terminal groups for metal centers permits the selective capture ofindividual iron atoms at low temperature.