Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 25: Organic Molecules on Inorganic Substrates III: Adsorption & Growth

O 25.5: Vortrag

Dienstag, 19. März 2024, 11:30–11:45, MA 043

Impact of alkyl side groups on the structure formation of merocyanines on the Ag(100) surface studied by STM, SPA-LEED, and NIXSW — •Anna Juliana Kny¹, Anja Haags¹, Sergey Subach², and Moritz Sokolowski¹ — ¹Clausius Institut für Physikalische und Theoretische Chemie, Universität Bonn, Germany — ²Forschungszentrum Jülich, Germany

The control over the molecular packing is an important key aspect for the properties of molecular optoelectronic devices. In our study, we focus on the self-organization of merocyanine (MC) molecules which are in focus for applications due to high transition dipole moments.[1] Starting from the prototype MC 2-[5-(5-dibutylamino-thiophen-2-yl-methylene)-4-tert-butyl-5H-thiazol-2-ylidene]-malononitrile (HB238) [2] we systematically altered the length of the alkyl side groups and investigated their influence on the adsorption and ordering on the Ag(100) surface. We used SPA-LEED, STM, XPS, and NIXSW. Remarkably, a formation of homochiral tetrameric aggregates is observed for all investigated MCs, independently from their alkyl side groups. However, the side groups have a large impact on the lateral packing of the aggregates and the registry to the underlying Ag(100) surface. We present NIXSW data which give an additional insight to the surface bonding of the tetrameric aggregates. The MC were kindly provided by the Meerholz group (Cologne). We acknowledge experimental support from D. Duncan (DLS). Supported by the DFG through the research training group 2591 and the Diamond Light Source, UK. [1] JACS 137 (2015) 13524. [2] Nanoscale 15 (2023) 10319.

Keywords: Merocyanines; NIXSW; SPA-LEED; STM; Self-organization