Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 15: Metal Substrates II: Adsorption and Reactivity

O 15.6: Vortrag

Montag, 1. April 2019, 16:15–16:30, Kunsthalle

Kinetic control of reaction products in porphine oligomerization on Au(111)Knud Seufert1,3, •Simon Jaekel1, Leonhard Grill1, Fiona McBride2, Bareld Wit2, Shamsal Haq2, Rasmita Raval2, Paolo Poli2, and Mats Persson21Institut für Chemie, Universität Graz — 2Dept. of Chemistry, University of Liverpool — 3Fakultät für Physik, TU München

Nanostructures built from porphyrins have shown much promise in diverse applications such as light harvesting, optoelectronics, gas sensing and molecular electronics [1,2,3]. Investigating these nanostructures on metallic surfaces allows investigations of the electronic properties of individual nanostructures [3]. It has been shown that such nanostructures can be synthesized on surfaces through homocoupling of porphyrin molecules at the macrocycle[4,5]. The resulting oligomers are of particular interest as they are fully conjugated and the reaction leaves no side products on the surface.

Here, we report scanning tunneling microscopy results for porphine coupling on Au(111). The binding motifs of the reaction products are shown to be not only determined by energetic stability, but also by the reaction kinetics. Therefore, the final structure and hence electronic properties of the oligomers can be tuned via different reaction pathways while using the same monomers.

[1]Lin et al. Science 1994, 264, 1105 [2]Nguyen et al. Phys. Rev. B 2008, 77, 195307 [3] Kuang et al. J. Am. Chem. Soc 2016, 138, 11140 [4] Wiengarten et al. J. Am. Chem. Soc. 2014, 136, 9346 [5]Xiang et al ACS Nano 2018, 12, 1203

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