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O: Fachverband Oberflächenphysik
O 9: Organic molecules on inorganic substrates: electronic, optical and other properties I
O 9.10: Vortrag
Montag, 9. März 2026, 17:15–17:30, HSZ/0201
Debromination and π-radical formation by single-electron injection on an insulator — •Ye Liu1, Felix Giselbrecht1, Lucía Gómez-Rodrigo2, Manuel Vilas-Varela2, Tzu-Chao Hung1, Diego Peña2, and Jascha Repp1 — 1University of Regensburg, Germany. — 2Universidade de Santiago de Compostela, Spain.
The creation of π-radicals in nanostructures offers promising opportunities in spintronics and quantum technologies1,2, yet their controlled formation on an insulator remains challenging3. Here, we investigated the charge-induced reaction of 11-bromo-11H-benzo[b]fluorene on thick NaCl films (> 20 monolayers) using non-contact atomic force microscopy. The injection of only one electron from the microscope's tip induces debromination, which yield an open-shell structure and a bromide anion. In contrast, removal of an electron from the precursor results in a cation without bond cleavage. The voltage threshold for debromination depends on the molecular adsorption geometry, specifically on whether the bromine atom points upward or downward, reflecting opposite orientations of the molecular dipole moment. We present a feasible tip-induced synthesis strategy for generating a π-radical in molecule on an insulator, offering a promising route toward constructing larger open-shell nanostructure with multiple π-radicals on such surfaces.
Keywords: Insulator; tip-induced synthesis; one electron attachment; debromination; π-radical