SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Metal Substrates: Adsorption and Reaction of Small Molecules I
O 3.3: Vortrag
Montag, 27. März 2023, 11:00–11:15, CHE 91
STM-induced ring closure of vinylheptafulvene molecular dipole switches on Au(111) — •Suchetana Sarkar1, Kwan Ho Au-Yeung1, Tim Kuehne1, Oumaima Aiboudi2, Dmitry A. Ryndyk3,4, Thomas Heine4, Franziska Lissel2,4, and Francesca Moresco1 — 1Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany — 2Leibniz Institute of Polymer Research, 01069 Dresden, Germany — 3Institute for Materials Science, TU Dresden, 01062 Dresden, Germany — 4Faculty of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden Germany
Dihydroazulene/vinylheptafulvene pairs are known as molecular dipole switches that undergo a ringopening/- closure reaction by UV irradiation or thermal excitation. We show that the ring-closure reaction of a single vinylheptafulvene adsorbed on the Au(111) surface can be induced by voltage pulses from the tip of a scanning tunneling microscope. This cyclization is accompanied by the elimination of HCN, as confirmed by simulations. Post the ring closure reaction, lateral movement induced via voltage pulses from the STM tip shows a different response. This behaviour is discussed by comparing the dipole moment and the charge distribution of the open and closed forms on the surface.