Site-specific bonding of copper adatoms to pyridine end groups mediating the formation of two-dimensional coordination networks on metal surfaces
Site-specific bonding of copper adatoms to pyridine end groups mediating the formation of two-dimensional coordination networks on metal surfaces
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DOI：
10.1103/physrevb.89.235409
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发表时间：
2014-06-09
影响因子：
3.7
通讯作者：
Kuch, W.
中科院分区：
文献类型：
--
作者：
Umbach, T. R.;Bernien, M.;Kuch, W.
在Cu（111）和Ag（111）金属表面研究了有机吡啶基2,4,6-三（4-吡啶）- 1,3,5-三嗪（T4PT）与Cu原子组成的配位网络。利用扫描隧道显微镜，我们发现有机分子T4PT在Cu（111）表面形成了稳定的二维多孔网络，并且通过Cu原子的共沉积，也在Ag（111）晶体上形成了Cu原子与T4PT分子双重配位的多孔网络。Ag（111）上金属有机网络Cu-T4PT的x射线吸收光谱测量和密度泛函理论计算表明，T4PT分子吡啶端基的氮原子是配位Cu原子的活性位点。x射线磁圆二色性实验表明，该金属有机基序中的Cu原子处于低价d（10）态，没有磁矩。
We study the formation of a coordination network consisting of the organic pyridine-based 2,4,6-tris(4-pyridine)- 1,3,5-triazine (T4PT) species and Cu atoms on Cu(111) and Ag(111) metal surfaces. Using scanning tunneling microscopy, we find that the organic molecule T4PT forms stable two-dimensional porous networks on the surface of Cu(111) and, by codeposition of Cu atoms, also on the Ag(111) crystal, in which Cu atoms are twofold coordinated by T4PT molecules. X-ray absorption spectroscopy measurements of the metal-organic network Cu-T4PT on Ag(111) accompanied by density-functional theory calculations show that the nitrogen atoms of the pyridine end groups of the T4PT molecules are the active sites in coordinating the Cu adatoms. X-ray magnetic circular dichroism experiments reveal that the Cu atom in such a metal-organic motif is in a low-valent d(10) state and has no magnetic moment.