SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 89: Poster Session VII: Organic molecules on inorganic substrates: electronic, optical and other properties III
O 89.5: Poster
Donnerstag, 4. März 2021, 10:30–12:30, P
On-surface synthesis of porphyrin tetramers — •Eduardo Corral-Rascon1, Alexander Riss1, Pingo Mutombo2, Adam Matej2, Yang Bao1, Pavel Jelinek2, and Willi Auwärter1 — 1Physics Department E20, Technical University Munich, Germany — 2Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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 Ag(100)-supported porphyrin tetramers that possess a cyclooctatetraene (COT) moiety at their center. Bond-resolved atomic force microscopy (AFM) and scanning tunneling microscopy (STM) supported by density functional theory (DFT) calculations were used to characterize the coupling and the emerging electronic properties. In particular we compared the apparent bond lengths and electronic states of Zn-metalated and different tautomers of base-free tetramers.
[1] Wiengarten, A. et al. J. Am. Chem. Soc. 2014, 136, 26, 934.
[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.