SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 3: Metal Substrates: Adsorption and Reaction of Small Molecules I
O 3.2: Talk
Monday, March 27, 2023, 10:45–11:00, CHE 91
Controlling the Switching of Azobenzene Derivatives on Graphite-Air Interface — •Thiruvancheril G. Gopakumar1, Khushboo Yadav1, Hariom Birla1, Showkat H. Mir2, Thomas Halbritter3, Alexander Heckel3, and Jayant K. Singh2 — 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India — 2Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India — 3Institute for Organic Chemistry and Chemical Biology, Goethe-University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
The trans isomer of azobenzene (AB) and its derivatives is the most abundant under equilibrium-thermodynamical conditions and is known to switch between its trans and cis states when triggered by light and electrons/holes on graphite.[1] In this work, we show that AB derivatives are switching between two cis states (cis, cis') when electrons/holes induced switching is performed on a cis dominant non-equilibrium initial condition at HOPG-air interface. The switching efficiency in the cis adlayer is several folds higher than that in the trans adlayer. This is related to the low switching barrier for cis-cis' switching compared to that of trans-cis switching as revealed by density functional theory (DFT) calculations.[2]
1) K. Yadav, S. Mahapatra, T. Halbritter, A. Heckel, T. G. Gopakumar, J. Phys. Chem. Lett., 2018, 9, 6326-6333. 2) K. Yadav, H. Birla, S. H. Mir, T. Halbritter, A. Heckel, J. K. Singh, T. G. Gopakumar, Appl. Surf. Sci. 2023, 612, 155747