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O: Fachverband Oberflächenphysik
O 7: Focus Session: Functional Molecules at Surfaces I
O 7.1: Vortrag
Montag, 16. März 2020, 10:30–10:45, TRE Ma
Tuning the Halogen Bond between Adsorbed Organic Molecules — Jalmar Tschakert1, Qigang Zhong1, Sebastian Ahles2, Pascal Henkel3, Tobias Schlöder3, Carlos Romero Muniz4, Pablo Puo4, Ruben Perez4, Doreen Mollenhauer3, Hermann A. Wegner2, Andre Schirmeisen1, and •Daniel Ebeling1 — 1Institute of Applied Physics, Justus Liebig University Giessen, Germany — 2Institute of Organic Chemistry, Justus Liebig University Giessen, Germany — 3Institute of Physical Chemistry, Justus Liebig University Giessen, Germany — 4Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain
Halogen bonds are ideally suited for designing molecular assemblies because of their strong directionality and the possibility of tuning the interactions by using different types of halogens or molecular rests. This is interesting for applications in supramolecular chemistry, crystal engineering, or drug design. Here, we present a new approach for tuning the 2D self-assembly process of organic molecules by adsorption to different metal surfaces. The so-called σ-hole, the positive region at the cap of a halogen, which acts as the halogen bond donor can be actively tuned by molecule-substrate interactions. Since this effect depends strongly on the polarizability of the halogen and the reactiveness of the metal substrate it can be employed for controlling intermolecular connections including their bonding angles and the selectivity of bonding sites. Our results provide new insights into the nature of halogen bonds and their complex interplay with metal surfaces.