SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Poster Session I: Organic molecules on inorganic substrates: Adsorption and growth I

O 6.4: Poster

Montag, 1. März 2021, 10:30–12:30, P

Chiral Recognition in the Self-Assembly of Trioxa[11]helicene on Metal Surfaces — •Bahaaeddin Irziqat¹, Jan Berger^1,2, Jesús Mendieta-Moreno², Mothuku Shyam Sundar³, Ashutosh V. Bedekar⁴, and Karl-Heinz Ernst^1,2 — ¹Surface Science and Coating Technologies, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Dübendorf, Switzerland — ²Nanosurf Laboratory, Institute of Physics, The Czech Academy of Sciences, Prague, Czech Republic — ³Institute of Organic Chemistry and Biochemistry, The Czech Academy of Sciences, Prague, Czech Republic — ⁴Department of Chemistry, The Maharaja Sayajirao University of Baroda, Vadodara, India

Chiral molecules adsorbed on metal surfaces have promising properties for applications in devices based on organic materials, such as chiroptical sensors or electron-spin filters. For this purpose, the two-dimensional (2D) crystallization of trioxa[11]helicene (TO[11]H) on the single crystalline (100) surfaces of Ag and Cu have been studied using scanning probe microscopy techniques (STM/nc-AFM) assisted by molecular dynamics simulations. In similarity to previously reported 2D-crystallization of heptahelicene ([7]H) on Ag(100) and Cu(100) [1,2], TO[11]H on Ag(100) shows a transition from homochiral structural motifs to large heterochiral domains with increasing coverage, whereas on Cu(100), enantiopure mirror domains, forming a 2D conglomerate structure, are observed.