Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.9: Vortrag
Montag, 31. März 2014, 12:30–12:45, TRE Phy
Diarylethene molecules on a Ag(111) surface: stability and electric field-induced switching of single molecules — •Nino Hatter1, Jonas Wirth2, Robert Drost1, Tobias R. Umbach1, Sara Barja1, Marc Zastrow3, Karola Rück-Braun3, Jose I. Pascual4, Peter Saalfrank2, and Katharina J. Franke1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Germany — 2Institut für Chemie, Universität Potsdam, Germany — 3Institut für Chemie, Technische Universität Berlin, Germany — 4CIC nanoGUNE, Dondostia-San Sebastian, Spain
Diarylethene derivatives are photochromic molecular switches, existing in two different forms, a ring-closed one with a conjugated π electron system and a ring-opened, where the conjugation is broken. Light irradiation can induce a reversible ring-opening/closing reaction, as has been shown for molecules in solution and bulk crystals. However, little is known about their switching behaviour when adsorbed on surfaces.
We present a combined approach of scanning tunneling microscopy/spectroscopy (STM/STS) and density functional theory (DFT) calculations of 4,4’-(4,4’-(Perfluorocyclopent-1-ene-1,2-diyl)bis(5-methylthiophene-4,2-diyl)dipyridine (PDTE) adsorbed on a Ag(111) surface. The STM measurements show only one isomer present on the surface after evaporation of PDTE which can be switched by controlled manipulation with the STM tip. Comparison to the DFT calculations suggests that the manipulation with the tip induces the ring-closure reaction.