Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 31: Molecular Films: Properties and Preparation
O 31.6: Talk
Tuesday, April 1, 2014, 11:45–12:00, WIL A317
Molecular Orientation and Excitonic Coupling in Photoswitchable Azobenzene-Based SAMs on Gold(111) — •Thomas Moldt1, Daniel Brete1, Daniel Przyrembel1, Joel R. Goldman2, Rafal Klajn2, Cornelius Gahl1, and Martin Weinelt1 — 1Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel
We present results of polarization-dependent UV/vis Differential Reflectance Spectroscopy (DRS) and Near Edge X-Ray Fine Structure (NEXAFS) spectroscopy measurements performed on mixed self-assembled monolayers (SAMs). The layers consist of 11-(4-(-phenyldiazenyl)phenoxy)undecane-1-thiol (Az11) and dodecane-1-thiol (C12). The average orientation of the azobenzene moieties and the strength of the excitonic coupling between the chromophores depend on the component ratio in the SAM. Likewise, this influences the efficiency of the reversible photoswitching of the layer.