| Title | Site-specific bonding of copper adatoms to pyridine end groups mediating the formation of two-dimensional coordination networks on metal surfaces |
| Authors | T. R. Umbach, M. Bernien, C. F. Hermanns, L. L. Sun, H. Mohrmann, K. E. Hermann, A. Krueger, N. Krane, Z. Yang , F. Nickel, Y.-M. Chang, K. J. Franke, J. I. Pascual, W. Kuch |
| Journal | Physical Review B |
| Vol. 89, 2014, pg. 235409 |
| 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 co-deposition of Cu atoms, also on the Ag(111) crystal, in which Cu atoms are two-fold 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. |
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