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O: Fachverband Oberflächenphysik
O 8: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation I
O 8.3: Vortrag
Montag, 17. März 2025, 11:15–11:30, H24
Self-assembly, electronic structure, and switching of norbornadiene derivative photoswitches — •Shreya Garg1, Vishakya Jayalatharachchi1, Pedro Ferreira2, Roberto Robles3, Sajjan Mohammad1, Shivani Singh1, Nicolás Lorente3,4, Kasper Moth-Poulsen2, Meike Stöhr1,5, and Sabine Maier1 — 1Department of Physics, Friedrich Alexander University Erlangen-Nürnberg, Germany — 2Polytechnic University of Catalonia, Catalonia, Spain — 3Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), Donostia-San Sebastian, Spain — 4Donostia International Physics Center (DIPC), San Sebastian — 5University of Applied Sciences of the Grisons, Switzerland
Molecular photoswitches such as norbornadiene (NBD) derivatives are promising energy storage compounds due to their ability to switch to the metastable quadricyclane (QC) isomer with long half-lives and high-energy storage density. However, the NBD/QC derivative photoswitches remain largely unexplored on the surface. Here, we discuss the self-assembly, electronic structure, and switching of carboxylic acid- functionalized NBD derivative on the Au(111) surface using scanning tunneling microscopy complemented by density functional theory calculations. To explore the impact of the molecule-surface interactions, we also studied them on graphene, which acts as a decoupling layer. We observed distinct hydrogen-bonding motifs between the NBD derivatives on the two surfaces. Our study highlights differences in the electronic properties between the Au(111) and graphene surface, providing insights into optimizing their switching performance on surfaces.
Keywords: molecular photoswitches; STM; DFT