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Published on: March 4, 2021
Spectroscopic STM studies of single gold(III) porphyrin molecules
Stefan Müllegger1, Wolfgang Schöfberger, Mohammad Rashidi
1Department of Solid State Physics and Institute of Inorganic Chemistry, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria. stefan.muellegger@jku.at
Abstract:
Low-temperature scanning tunneling microscopy, a well-established technique for single-molecule investigations in an ultrahigh vacuum environment, has been used to study the electronic properties of Au(III) 5,10,15,20-tetraphenylporphyrin (AuTPP) molecules on Au(111) at the submolecular scale. AuTPP serves as a model system for chemotherapeutically relevant Au(III) porphyrins. For the first time, real-space images and local scanning tunneling spectroscopy data of the frontier molecular orbitals of AuTPP are presented. A comparison with results from density functional theory reveals significant deviations from gas-phase behavior due to a non-negligible molecule/substrate interaction. We identify the oxidation state of the central metal ion in the adsorbed AuTPP as Au(3+).
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