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Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 64: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures IV

O 64.1: Talk

Wednesday, March 14, 2018, 15:00–15:15, MA 004

Crystallization of a Two-Dimensional Hydrogen-Bonded Molecular Assembly: Evolution of the Local Structure Resolved by Atomic Force Microscopy — •Laerte L. Patera1, Xunshan Liu2, Nico Mosso3, Silvio Decurtins2, Shi-Xia Liu2, and Jascha Repp11University of Regensburg, Regensburg, Germany — 2University of Bern, Bern, Switzerland — 3IBM Research-Zurich, Rüschlikon, Switzerland

Noncontact Atomic Force Microscopy (nc-AFM) provides detailed insights into the structure of surface-supported molecular self-assemblies, overcoming restrictions given by scanning tunneling microscopy (STM). Here we resolved the structures of the aromatic N-heterocyclic hexaaza-triphenylene (HAT) molecular synthon with sub-Å resolution by means of nc-AFM, both in the kinetically trapped amorphous state and in the thermo-dynamically stable crystalline phase. These results reveal how the crystallization governs the length scale of the network order for non-flexible molecular species without affecting the local bonding schemes. The capability of nc-AFM to accurately resolve structural relaxations will be highly relevant for the characterization of vitreous two-dimensional supramolecular materials.

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