Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 15: Organic Molecules on Inorganic Substrates II: Mainly Porphyrins

O 15.2: Talk

Monday, March 16, 2020, 15:30–15:45, REC C 213

On-surface synthesis of porphyrin tetramers — •Eduardo Corral-Rascon, Alexander Riss, Yang Bao, and Willi Auwärter — Physics Department E20, Technical University Munich, Germany

Covalently coupled porphyrins [1,2,3] hold great promise for molecular electronics, optoelectronics, gas sensing and light-harvesting. Furthermore, the electronic conjugation [4] might lead to antiaromatic behavior [3] and additionally offers ways to fabricate spin-coupled nanoarchitectures via introduction of metal centers into the porphyrin cores. Here we present the synthesis of porphyrin tetramers possessing a cyclooctatetraene (COT) moiety at the center of the molecules adsorbed on a Ag(100) surface. Bond-resolved atomic force microscopy (AFM) and scanning tunneling microscopy (STM) were used to characterize the coupling and the emerging electronic properties. In particular, we have investigated how the chemical structure affects the electronic conjugation throughout the molecule.

[1] Wiengarten, A. et al. J. Am. Chem. Soc. 2014, 136, 26, 9346

[2] Bischoff, A. et al. Angew. Chem. 2018, 130, 16262

[3] Nakamura, Y. et al. J. Am. Chem. Soc. 2006, 128, 4119

[4] Fatayer, S. et al. Science. 2019, 6449, 365, 142