Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures V
O 87.7: Vortrag
Donnerstag, 15. März 2018, 12:15–12:30, MA 004
STM studies of functional platform adlayers on Au(111) surfaces — •Talina Rusch1, Roland Löw2, Alexander Schlimm3, Felix Tuczek3, Rainer Herges2, and Olaf M. Magnussen1 — 1Institute of Experimental and Applied Physics, Kiel University, Germany — 2Otto Diels Institute of Organic Chemistry, Kiel University — 3Institute of Inorganic Chemistry, Kiel University
The functionalization of surfaces by self-assembled monolayers is of great interest in nanoscience. We have introduced the so called platform approach, where molecular platforms of Triazatriangulenium (TATA) [1, 2, 3] ions are employed for attaching freestanding functional units to metal surfaces. These platforms provide a well-defined lateral and vertical molecular architecture and the steric demand is controlled by different alkyl side chains. Here, detailed STM studies on different adsorbate layers of TATA derivatives are presented. Specifically, we will discuss the structure of mixed adlayers consisting of two different TATA derivatives, one where the attached azobenzene is fully conjugated and one where it is isolated. We found that those TATA derivatives are perfectly mixable and randomly distributed on the Au(111) surface. Furthermore, we will present direct STM observations of the photoswitching in new azobenzene functionalized TATA adsorbate layers.This work was supported by the Deutsche Forschungsgemeinschaft via SFB 677 "Function by switching". [1] B. Baisch et al., J. Am. Chem. Soc. 131 (2009) 442 - 443. [2] S. Kuhn et al., Phys. Chem. Chem. Phys. 12 (2010) 4481 - 4487. [3] J. Kubitschke et al., Eur. J. Org. Chem. 2010 (2010) 5041 - 5055.