Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.11: Vortrag
Montag, 31. März 2014, 13:00–13:15, TRE Phy
Investigation of novel partial charge-transfer compounds based on triangulene derivatives by ultraviolet photoelectron spectroscopy (UPS) and near-edge X-ray adsorption fine structure (NEXAFS) — •Alisa Chernenkaya1,2, K. Medjanik2, M. Kivala3, P. Nagel4, M. Merz4, S. Schuppler4, T. Shubina5, M. Baumgarten3, K. Müllen3, and G. Schönhense2 — 1Graduate School Materials Science in Mainz, 55128, Mainz, Germany — 2Inst. für Physik, JGU, 55128, Mainz, Germany — 3MPIP, 55021 Mainz, Germany — 4KIT, Inst. für Festkörperphys., 76021 Karlsruhe, Germany — 5Comp.-Chem.-Cent., 91052 Erlangen, Germany
A new class of donors and acceptors is represented by derivatives of the (4,4,8,8,12,12-hexamethyl-4H,8H,12H-benzo[1,9]quinolizino[3,4,5,6,7-defg]acridine) [1], so-called triangulene. We present UPS and NEXAFS results for molecular beam deposited thin films of triangulene and its trimethoxy derivative donors in complexes with the strong F4-TCNQ acceptor in comparison with density functional theory (DFT) calculations. The whole information about density of states (occupied valence states and unoccupied ones as well) in these charge-transfer systems is provided by these techniques as previously shown for pyrene derivatives [2]. We also compared CT complexes formation and film growth mechanisms in two systems that differ in three methoxy groups only.
Funded by DFG (Transregio TR49).
[1] M. Kivala et. al., Chem. Eur. J., 19, 8117-8128 (2013).
[2] K. Medjanik et. al., JACS 134, 4694-4699 (2012).