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O: Fachverband Oberflächenphysik
O 49: Metal substrates: Adsorption of organic / bio molecules VI
O 49.8: Vortrag
Mittwoch, 16. März 2011, 16:45–17:00, PHY C213
Experimental & theoretical study of a perylene derivative on Cu(111): insight into the bonding mechanism — •Mihaela Enache1, Jonas Björk2, Manfred Matena3, Jorge Lobo-Checa3, Lutz Gade4, Thomas Jung5, Mats Persson2, and Meike Stöhr1 — 1University of Groningen, Netherlands — 2University of Liverpool, UK — 3University of Basel, Switzerland — 4University of Heidelberg, Germany — 5Paul-Scherrer-Institute, Switzerland
By utilizing the concepts of supramolecular chemistry, remarkable results for molecular self-assembly on surfaces have been presented. The outcome of the self-assembly process is known to be affected by the fine tuning of different parameters which have a direct influence on the interplay between intermolecular and molecule-substrate interactions. In our case we studied the influence of temperature by annealing the sample. STM investigations of a perylene derivative (TAPP) deposited on Cu(111) held at -100°C showed that the molecules do not form an ordered arrangement. Annealing at room temperature results in the formation of a herringbone arrangement while the molecules interact with each other via vdW forces. After annealing at 150°C, a metal coordinated rectangular network is obtained which is commensurate to the substrate [1]. By performing XSW measurements, the vertical adsorption geometry for both phases of TAPP on Cu(111) was determined and such insight into the interplay between intermolecular and molecule-substrate interaction is gained. The findings are supported by DFT calculations. [1] Matena et al., Chem. Eur. J., 16, 2079 (2010)