Presenter: Prof. Norbert Koch (Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin, Germany; Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany)
Topic: Subtle Fluorination of Conjugated Molecules Enables Stable Nanoscale Assemblies on Metal Surfaces
Time: 10:00 AM, March 6th (Wednesday)
In molecular self-assembly on surfaces, the structure is governed by the intricate balance of attractive and repulsive forces between molecules as well as between molecules and substrate. Frequently, repulsive interactions between molecules adsorbed on a metal surface dominate in the low coverage regime, and dense self-assembled structures can only be observed close to full monolayer coverage. Here we demonstrate that fluorination at selected positions of conjugated molecules (sexiphenyl derivatives) provides for sufficiently strong yet non-rigid H×××F bonding capability that enables (i) the formation of stable nanoscale molecular assemblies on a metal surface and (ii) steering the assemblies’ structure. This approach should be generally applicable and will facilitate the construction and study of individual nanoscale molecular assemblies with structures that are not attainable in the high coverage regime.
Contact: Prof. Steffen Duhm