Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Organic-Inorganic Hybrid Systems and Organic Films I

O 5.5: Vortrag

Montag, 20. März 2017, 11:30–11:45, WIL A317

Breaking Degeneracy of Tautomerization - Influence of the substrate — •Markus Böhme1, Jens Kügel1, Aimee Sixta1,3, Andreas Krönlein1, and Matthias Bode1,21Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Wilhelm Conrad Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3University of Texas at Austin, Austin, Texas 78712, United States

We present a detailed study of the tautomerization, i.e., the switching of hydrogen protons, between different sites in the molecular frame of phthalocyanine (H2Pc) on Ag(111) by means of scanning tunneling microscopy (STM) [1]. Our data reveal that the symmetry mismatch between the substrate and the molecular frame lifts the energetic degeneracy of the two H2Pc tautomers. Their energy difference is so large that only one tautomer can be found in the ground state. Tip-induced tautomerization was triggered at sufficiently high bias voltages. By the controlled removal of a hydrogen proton from the molecule, a four-level system was created, consisting of two stable and two metastable states .

[1] J. Kügel et. al., ACS Nano Article ASAP DOI: 10.1021/acsnano.6b05924

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