Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 77: Nanostructures at surfaces:1D, 2D, networks II
O 77.1: Vortrag
Donnerstag, 12. März 2026, 10:30–10:45, HSZ/0204
Interplay of flexibility, coverage, and host-guest interaction in the self-assembly of Tris(4-carboxyphenyl)amine (TCA) on Au(111) — Vishakya Jayalatharachchi1, •Paul Philip Schmidt1, Roberto Robles2, Nicolas Lorente2, Meike Stöhr1,3, and Sabine Maier1 — 1Department Physik, FAU Erlangen-Nürnberg, Erlangen, Germany — 2CFM/MPC (CSIC-UPV/EHU), Donostia-San Sebastián, Spain — 3University of Applied Sciences of the Grisons, Switzerland
Triphenylamine derivatives are attractive building blocks for molecular architectures owing to their strong electron-donating properties, structural versatility, and ability to form highly ordered structures. Here, we explore how the non-planar and conformationally flexible arms of the unbridged threefold-symmetric TCA influence its self-assembly on Au(111), with particular emphasis on the formation and stability of porous networks. Using a combination of STM, LEED, and DFT, we show that RT deposition of TCA on Au(111) produces a coexistence of hexagonal porous domains and close-packed structures. Upon subsequent annealing, well-ordered porous networks emerge, stabilized by the dimeric carboxylic acid bonding motif. At higher coverage, this motif persists but instead directs the formation of close-packed assemblies. These findings provide insights into the interplay between molecular flexibility, intermolecular interactions, and coverage in directing supramolecular architectures of unbridged triphenylamines on metal surfaces. In addition, we show on the example of molecular rotors the hosting properties of the porous TCA network.
Keywords: selfassembly; porous networks; scannin tunneling microscopy; molecular rotors; molecules in pores