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O: Fachverband Oberflächenphysik
O 10: Organic Molecules on Inorganic Substrates II: Electronic, Optical and Other Properties II
O 10.6: Talk
Monday, March 27, 2023, 16:30–16:45, CHE 89
Electronic Properties of N-Heterotriangulene Derivatives adsorbed on Au(111) — •Jakob Steidel1, Ina Michalsky2, Milan Kivala2, and Petra Tegeder1 — 1Institute of Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg — 2Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg
A large number of opto-electronic devices based on organic compounds utilize donor-acceptor-systems (D-A-systems), for example as the emitting layer in organic light emitting diodes or for charge separation in organic photovoltaics. Triphenylamine and its derivatives are a class of donors in D-A-systems with a high potential for applications in devices.
Introducing an etheno-bridge in the planar triphenylamine derivative indolo[3,2,1-jk]carbazole (N-heterotriangulene-550, N-HTA-550) closes an antiaromatic ring with seven members in the resulting N-heterotriangulene-557 (N-HTA-557). This significantly changes the electronic structure while retaining the molecular geometry as well as the steric demands. By oxidation of N-HTA-557 and a subsequent condensation reaction with quinoxaline-2,3-diamine an intramolecular D-A-system is created.
In the present contribution we study the electronic properties of N-HTA-550 and its derivatives on a Au(111) surface using two-photon photoemission spectroscopy.