Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Organic Molecules on Inorganic Substrates I: Switching and Manipulation
O 28.8: Vortrag
Dienstag, 2. April 2019, 12:15–12:30, H24
Imprinting Directionality into Proton TransferReactions of an Achiral Molecule — •Markus Leisegang1, Jens Kügel1, and Matthias Bode1,2 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Wilhelm Conrad Röntgen Center of Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, 97074 Würzburg
Molecular motors play a mayor role in biological processes.
This has inspired scientists in the past to design molecular machines with controlled functionality on the nanoscale [1].
One key feature of any motor is directional motion.
In molecules directional motion is usually induced by structural chirality
which on one hand restricts the motion to a fixed direction, but on the other hand can’t easily be changed [2].
Here we present a scanning tunneling microscopy study of achiral H2Pc
and HPc molecules that acquire chirality by adsorption onto a Ag(100) surface.
The induced chirality is caused by a −29∘ (+29∘) rotation of H2Pc
with respect to the [011] substrate direction, resulting in tautomerization
that preferentially occurs in a clockwise (counterclockwise) direction.
The directionality is found to be independent of energy and location of charge carrier injection.
We show that—in contrast to unalterable structural chiralities determined by the molecular
structure—the direction of proton motion in HPc on Ag(100) can be inverted by a rotation of the molecule.
[1] M. van den Heuvel et al., Science 317, 333-336 (2007)
[2] J. Berna et al., Nat. Mater. 4, 704 (2005)
[3] J. Kügel et al., ACS nano 12, 8733-8738 (2018)