Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 38: Metal substrates: Adsorption of atoms and inorganic molecules
O 38.4: Talk
Tuesday, March 13, 2018, 14:45–15:00, MA 144
Control of rotational oscillation by protonation in single triazatruxene molecules — •Anja Bauer1, Markus Maier2, Werner Schosser1, Philipp Erler1, Florian Singer1, Fabian Pauly1, Yuriy Dedkov3,1, Rainer Winter2, and Mikhail Fonin1 — 1Department of Physics, University Konstanz, D-78457 Konstanz — 2Department of Chemistry, University Konstanz, D-78457 Konstanz — 3Department of Physics, Shanghai University, 200444 Shanghai, China
The opportunity of tuning the electric and magnetic properties [1] as well as the control of molecular motions on surfaces [2], [3], [4] is of great interest since it lays a foundation for the fabrication of molecule-based functional devices. Here we investigate the behavior of single triazatruxene (TAT) molecules on Ag(111) deposited by electrospray ionization method. Low temperature STM measurements reveal three different types of molecular appearance on Ag(111) which we assign to the non-, single- and double-protonated TAT. In non-protonated molecules tunneling current is shown to excite rotational oscillations between two stable adsorption configurations. Protonation, however, leads to an efficient suppression of the rotational oscillation and of the lateral mobility of the molecules. We further show the possibility to switch the oscillation on and off by detaching or attaching hydrogen to the nitrogen atoms of TAT.
[1] B. Borca et al., ACS Nano 9, 12506 (2015), [2] I. Swart et al., Nano Letters 12, 1070 (2012), [3] A. Krönlein et al, J. Phys. Chem. 120, 13843 (2016), [4] H.W. Kim et al., Phys. Rev. Lett. 106, 146101 (2011)