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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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Sun,  Lili
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Hermann,  Klaus
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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PhysRevB.89.235409.pdf
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Citation

Umbach, T. R., Bernien, M., Hermanns, C. F., Sun, L., Mohrmann, H., Hermann, K., et al. (2014). Site-specific bonding of copper adatoms to pyridine end groups mediating the formation of two-dimensional coordination networks on metal surfaces. Physical Review B, 89(23): 235409. doi:10.1103/PhysRevB.89.235409.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-DB07-C
Abstract
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 d10 state and has no magnetic moment