Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: Poster Focus Session: Molecular Nanostructures on Surfaces - New Concepts towards Complex Architectures
O 81.12: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Adsorption Conformation and Lateral Registry of Cobalt Porphines on Cu(111) — Martin Schwarz1, Manuela Garnica1, David Duncan2, Alejandro Perez Paz3, Jacob Ducke1, Peter Deimel1, Pardeep Kumar Thakur2, Tien-Lin Lee2, Angel Rubio4, Johannes V. Barth1, Francesco Allegretti1, and •Willi Auwärter1 — 1Technische Universität München, Germany — 2Diamond Light Source, United Kingdom — 3Yachay Tech University, Ecuador — 4Max-Planck-Institut für Struktur und Dynamik der Materie, Germany
The tetrapyrrole macrocycle of porphine is the common core of all porphyrin molecules, an interesting class of π-conjugated molecules with relevance in natural and artificial systems [1]. The functionality of porphines on a solid surface can be tailored by the central metal atom and its interaction with the substrate [2]. Here, we present a local adsorption geometry determination for cobalt porphine on Cu(111) by means of complementary scanning tunneling microscopy, high-resolution X-ray photoelectron spectroscopy and X-ray standing wave measurements, and density functional theory calculations. Specifically, the Co center was determined to be at an adsorption height of 2.25 ± 0.04 Å occupying a bridge site. The macrocycle adopts a moderate asymmetric saddle-shape conformation. Based on these results, we will discuss the interfacial interactions for this archetypical metallotetrapyrrole/metal system.
[1] F. Bischoff et al., ACS Nano 7, 3139 (2013)
[2] K. Diller et al., Chem. Soc. Rev. 45, 1629 (2016)