Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 86: Poster Session - Organic Molecules on Inorganic Substrates: Electronic, Optical and other Properties II
O 86.1: Poster
Wednesday, March 18, 2020, 18:15–20:00, P2/EG
STM and DFT study of BF4 anion migration on a triazatriangulenium SAM on Au(111) — •Sergii Snegir1, Yannick Dappe2, Dmitro Sysoiev3, Olivier Pluchery4, Thomas Huhn1, and Elke Scheer1 — 1University of Konstanz, Konstanz, Germany — 2SPEC, CEA, CNRS, University Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France — 3Institute of Organic Chemistry and Biochemistry, Prague, Czech republic — 4Institut des Nano-Sciences de Paris (INSP), Sorbonne Universités, CNRS, Paris, France
Chemical coupling of functional molecules with so-called platforms allows the formation of functional Self-Assembled Monolayer (SAM). An example is triazatriangulenium (TATA), with extended aromatic core, allowing the formation of good electronic contact with the metal surface. Here we present studies on SAMs of TATA-BF4 molecules on Au(111) by means of Scanning Tunneling Microscopy (STM) and Density Functional Theory (DFT). In solution, these molecules exist as ion pairs of TATA+ and BF4-. However, under electrochemical deposition on Au(111) [1], on the TATA+ cations formed SAMs the BF4- anions seemingly disappear. Our STM experiments reveal dissociation of the TATA-BF4 complex. The TATA+ remains stable within the SAM while the BF4- spontaneously migrates through the TATA SAM on the surface. DFT calculations show a reduction of the TATA-BF4 binding energy after deposition. [1]-S. Kuhn, U. Jung, S. Ulrich, R. Herges and O. Magnussen, Chemical Communications, 2011, 47, 8880-8882.