Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Poster Tuesday: Adsorption and Catalysis 1
O 32.6: Poster
Dienstag, 6. September 2022, 11:00–13:00, P3
Real-space study of carbenes using a diazofluorene precursor adsorbed on a Cu(111) surface — •Hussain Mazhar1, Julien Rowen2, Wolfram Sander2, and Karina Morgenstern1 — 1Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, 44801 Bochum, Germany — 2Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany
Carbene is a reactive intermediate playing a vital role for many synthesis in the pharmaceutical industry [1]. Here, we study their properties on a metal substrate in real space using scanning tunnelling microscopy (STM) at 5 K. As carbenes are highly reactive species, they cannot be deposited directly on metal surfaces. The arrangement of their precursors on the surface is crucial for the carbene reactivity upon carbene formation. Diazofluorene molecules, already studied on the Ag(111) surface [2], are used as a precursor of the carbene to compare the influence of the surface on carbene reactivity. The STM study reveals dimer and cluster formation of the carbene precursor molecules on Cu(111) when deposited at 50 K and 100 K. While at 50 K more dimer formation occurs, at 100 K cluster formation is noticeable. An electrostatic surface potential map is used to determine charge distribution of the dimers. For carbene formation, a particular energy is required to cleave the diazo part from the molecule. In this study, we used STM manipulation to estimate the energy for the dissociation of the molecule. [1] Patil, Siddappa A, Future Med. Chem. 7. (2015) 1305-1333 [2] Mieres-Perez, Joel, J. Am. Chem. Soc. 143. (2021) 4653-4660