Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 13: Nanostructures at Surfaces 2

O 13.7: Talk

Monday, September 5, 2022, 16:30–16:45, S052

Elucidating the chirality of polycrystalline films with fundamental and SHG-CD — •Kevin Liang¹, Florian Ristow², Jakob Scheffel², Natalie Fehn¹, Reinhard Kienberger², Ueli Heiz¹, Aras Kartouzian¹, and Hristo Iglev² — ¹Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technical University of Munich — ²Physics Department E11, Technical University of Munich

Preferential desorption of enantiomers of 1,1'-Bi-2-naphthol (BINOL) has been observed, depending on the handedness of circularly polarised light, which is of interest for enantioenrichment processes. Therefore, characterisation of the enantiomeric excess of the sample and the understanding of its chirality is key. However, that requires further studies and greater clarification to be carried out and obtained, respectively. This contribution discusses the optical properties of BINOL thin films with fundamental and second harmonic generation (SHG) circular dichroism spectroscopy (CD) with different sample preparation methods, enantiomeric compositions and under varying experimental conditions. Depending on the previous conditions mentioned, the observed CD and anisotropy (g) value can be even of opposite sign for the same thin film.