Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 5: Nanostructures at Surfaces I: Organics
O 5.7: Vortrag
Montag, 1. April 2019, 12:00–12:15, H15
Nanopatterns of molecular squares on graphite — Kristin Gratzfeld, Nina Schönfelder, Tristan J. Keller, Sigurd Höger, and •Stefan-Sven Jester — Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany
Supramolecular nanopatterns of arylene-alkynylene-macrocycles at the solid/liquid interface on HOPG are studied by scanning tunneling microscopy. We recently reported on self-assembled monolayers of molecular squares carrying pairs of OC16H33 side chains on all four sides.[1] Here, we present a series of molecules with a reduced (i.e. D2h) symmetry: The (still) quadratic backbones carry pairs of long and short side chains of constant (OC16H33) and variable (OCnH2n+1, n = 6, 8, 10, 12) chain lengths, respectively. Chains of identical lengths are observed to interdigitate intermolecularly in ABAB packing schemes. Concentration dependent polymorphism is related to robust and less robust side chain packing. The more dense polymorphs are compared with monolayers of squares that carry only OC16H33 substituents on two opposing sides. The work is part of a supramolecular surface tiling strategy. [1] S.-S. Jester, E. Sigmund, S. Höger J. Am. Chem. Soc. 2011, 133, 11062.