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Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Organic/bio Molecules on Metal Surfaces II

O 14.5: Vortrag

Montag, 31. März 2014, 17:00–17:15, TRE Phy

Controlling intramolecular hydrogen transfer — •Takashi Kumagai1, Felix Hanke2, Sylwester Gawinkowski3, John Sharp2, Konstantinos Kotsis2, Jacek Walik3, Mats Persson2,4, and Leonhard Grill1,51Fritz-Haber Institute, Berlin, Germany — 2University of Liverpool, Liverpool, UK — 3Polish Academy of Science, Warsaw, Poland — 4Chalmers University of Technology, Göteborg, Sweden — 5University of Graz, Graz, Austria

Although the local environment of a molecule can play an important role in its chemistry, rarely has it been examined experimentally at the level of individual molecules. We report the precise control of intramolecular hydrogen transfer reactions (i.e. tautomerization) in single porphycene molecules using low-temperature scanning tunneling microscopy (STM) [1]. Single porphycene molecules adsorbed on a Cu(110) surface were imaged by STM at 5 K and found to have only cis configuration in which the inner H-atoms located on the one side in the cavity. The cis-cis tautomerization is induced either by STM via inelastic electron tunneling process at 5 K or thermal activation at elevated temperatures. We found that the tautomerization can be precisely tuned up and down by placing a Cu adatom nearby a molecule. The adatom is controlled using the STM manipulation.

[1] T. Kumagai et al. Nature Chemistry, accepted.

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