Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Organic Molecules at Surfaces 4: Chemistry on Surfaces
O 40.3: Vortrag
Mittwoch, 7. September 2022, 11:00–11:15, S051
N-Heterotriangulenes Donors and Charge Transfer Complexes formed with strong Electron Acceptors investigated with Two-Photon Photoemission Spectroscopy — •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
Many opto-electronic devices such as organic photovoltaic cells or organic light emitting diodes utilize donor-acceptor-systems (D-A-systems). Triphenylamine derivatives are promising candidates for donors in D-A-systems.1 The introduction of an etheno-bridge in the planar triphenylamine derivative indolo[3,2,1-jk]carbazole (N-HTA-550) creates a seven membered antiaromatic ring in the resulting N-Heterotriangulene-557 (N-HTA-557). While the molecular geometry is mostly preserved, the electronic structure is strongly modified by this additional -C=C-moiety.
In the present contribution we study the electronic properties of N-HTA-550 and N-HTA-557 on a Au(111) surface using two-photon photoemission (2PPE) spectroscopy and temperature programmed desorption (TPD). Furthermore the formation of charge transfer complexes with strong electron acceptors (TCNQ and F4TCNQ) is investigated utilizing both 2PPE and TPD.