Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.29: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Long range odered monolayers and lifting of the Au(111) reconstruction by sulfur containing organic donor molecules — •Benjamin Fiedler1, Elena Rojo-Wiechel1, Johann Classen1, Julia Simon2, Johannes Beck2, and Moritz Sokolowski1 — 1Institut für Physikalische und Theoretische Chemie der Universität Bonn — 2Insititut für Anorganische Chemie der Universität Bonn
We have studied the adsorption and monolayer formation on Au(111) of the well-known donor molecule TTT (Tetrathiotetracene) and the novel donor molecules TBTA (Tetrabenzothianthrene) by high resolution LEED. TTT forms a commensurate monolayer, whereas the submonolayer is disordered, which we interpret to be related to repulsive intermolecular interactions. Interestingly, the (√3 x 22) herringbone reconstruction of the Au(111) surface is lifted already for small coverages. Quite differently the reconstruction is preserved for adsorption of TBTA, which also forms a highly ordered monolayer, which is incommensurate. With respekt to the molecule in the bulk, the surface bonded molcule is planarized. We discuss these findings in the relation to the electron donating character of the molecules and the chemical bonding to the surface.
This work was supported by the DFG under SFB 813.