Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 76: Poster IIIC

HL 76.3: Poster

Thursday, March 19, 2020, 15:00–17:30, P2/4OG

Electrochemical and Spectroelectrochemical Characterization of Methoxylated and Fluorinated Bis(bis(8−quinolinyl)amide)₂metal(II) Complexes — •Sophie Göbel¹, Thi Hai Quyen Nguyen¹, Harald Locke², Peter R. Schreiner², and Derck Schlettwein¹ — ¹Justus Liebig University Gießen, Institute of Applied Physics — ²Justus Liebig University Gießen, Institute of Organic Chemistry

Organic semiconductors are targeted for applications in flexible electronic devices such as organic transistors. Intermolecular coupling is strongly influenced by the arrangement of molecules in solid state. In this work, well-stacking bis(bis(8−quinolinyl)amide)₂metal(II) molecules with different central cations (Fe, Cr, Zn, and Mn) as well as their corresponding methoxylated and fluorinated derivates were analysed in their electronic and optical properties. Cyclic voltammetry of the molecules in solution was performed in a three-electrode setup to estimate the HOMO- and LUMO level of each molecule. Supporting spectroelectrochemical studies were carried out by in situ UV/Vis spectroscopy for a clear assignment of the redox and oxidation waves. By comparing the unsubstituted with the substituted complexes, a down-shift of the energy levels was observed revealing the inductive and mesomeric effects of the methoxy- and fluoro groups altering the effective electron density in the aromatic core. The obtained values for the energy levels of the different molecules allow good estimations for future investigations of their electrical contact behaviour in devices and performances in thin films.