Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Organic Molecules on Inorganic Substrates I: Switching and Manipulation
O 28.3: Vortrag
Dienstag, 2. April 2019, 11:00–11:15, H24
Effect of deprotonation on the electronic structure of phthalocyanine molecules on molybdenum disulfide — •Gael Reecht, Nils Krane, Christian Lotze, and Katharina J Franke — Freie Universität Berlin , Berlin ,Germany
Scanning probe techniques (SPM) enable the modification of the chemical structure of single molecules with atomic precision. The formation of radicals is one the capabilities of this single-molecule chemistry but their stabilization is generally inhibited for molecule directly adsorbed on a metal substrate. Here we study by scanning tunneling microscopy and spectroscopy free-base phthalocyanines on MoS2/Au(111). We observe that under the influence of the tip, the molecule can be modified with major changes of its electronic structure. By investigating the tautomerization properties of the phthalocyanine and with DFT simulations in gas phase, we determine that the modification of the molecule is due to a deprotonation, from H2Pc to HPc. With the MoS2 acting as decoupling layer, the deprotonated molecule keep its radical character, with the HOMO being singly occupied.