Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 69: Poster: Spin Phenomena in Chiral Molecular Systems

O 69.1: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Self-assembly of the chiral donor-acceptor molecule DCzDCN on Cu(100) — Robert Ranecki, •Stefan Lach, and Christiane Ziegler — RPTU Kaiserslautern - Landau and Research Center OPTIMAS, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern, Germany

The twisted donor-acceptor molecule DCzDCN (5-(4,6-diphenyl-1,3,5-triazine-2-yl)benzene-1,3-dinitrile) shows an interesting self-assembly behavior on Cu(100). This D-A molecule is of particular interest as a system that uses reverse intersystem crossing (rISC) to massively increase the fluorescence yield. The orientation of the molecules with the donor part towards the substrate results in a chiral resolution at the interface, forming only homochiral phases. It ranges from tetramers in the submonolayer region to 1D structures near monolayer coverage, with a slight excess of the M-(-) dimer-determined phases. Using a multi-method approach with STM/STS and photoelectron spectroscopy, the topography and the molecular electronic properties of the DCzDCN/Cu(100) system are studied globally and locally. The appearance of hybrid interface states (HIS) will be discussed [2].

[1] Y. J. Cho et al. Adv. Mater. 26, 4050 (2014) [2] R. Ranecki et al. arXiv:2310.19534 [cond-mat.mtrl-sci]

Keywords: homochiral structures; self-assembly; hybrid interface states; chiral resolution