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Understanding the Interaction of the Porphyrin Macrocycle to Reactive Metal Substrates: Structure, Bonding, and Adatom Capture

M. S. Dyer ; A. Robin ; S. Haq ; R. Raval ; Mats Persson (Institutionen för teknisk fysik, Material- och ytteori) ; J. Klimes
ACS Nano (1936-0851). Vol. 5 (2011), 3, p. 1831-1838.
[Artikel, refereegranskad vetenskaplig]

We investigate the absorption and conformation of free-base porphines on Cu(110) using STM, reflection absorption infrared spectroscopy, and periodic DFT calculations in order to understand how the central polypyrrole macrocycle, common to all porphyrins, interacts with a reactive metal surface. We find that,the-macrocycle forms a chemisorption bond with the surface,, arising from electron donation into down-shifted, and nearly degenerate unoccupied porphine orbitals accompanied with electron back-donation from molecular pi-orbitals. Our calculations show that van der Waals interactions give rise to an overall Increase in the adsorption energy but only minor changes in the adsorption geometry and electronic structure. In addition, we observe copper adatoms being weakly attracted to adsorbed porphines at specific molecular sites. These results provide important insights into porphyrin-surface interactions that ultimately, will govern the design of robust surface mounted molecular devices based on this important class of molecules.

Nyckelord: free-base porphine, molecular adsorption, Cu(110) surface, scanning, tunneling microscopy, reflection absorption infrared spectra, density, functional calculations, van der Waals interactions, surface, molecules, cu(110), stm, tetrapyridyl, adsorption, chemistry, au(111), ag(110), ptcda

Denna post skapades 2011-04-12.
CPL Pubid: 138964


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