Lesnard, Hervé Bocquet, Marie-Laure Lorente, Nicolás Dehydrogenation of Aromatic Molecules under a Scanning Tunneling Microscope:  Pathways and Inelastic Spectroscopy Simulations We have performed a theoretical study on the dehydrogenation of benzene and pyridine molecules on Cu(100) induced by a scanning tunneling microscope (STM). Density functional theory calculations have been used to characterize benzene, pyridine, and different dehydrogenation products. The adiabatic pathways for single and double dehydrogenation have been evaluated with the nudge elastic band method. After identification of the transition states, the analysis of the electronic structure along the reaction pathway yields interesting information on the electronic process that leads to H-scission. The adiabatic barriers show that the formation of double dehydrogenated fragments is difficult and probably beyond reach under the actual experimental conditions. However, nonadiabatic processes cannot be ruled out. Hence, in order to identify the final dehydrogenation products, the inelastic spectra are simulated and compared with the experimental ones. We can then assign phenyl (C<sub>6</sub>H<sub>5</sub>) and α-pyridil (α-C<sub>5</sub>H<sub>4</sub>N) as the STM-induced dehydrogenation products of benzene and pyridine, respectively. Our simulations permit us to understand why phenyl, pyridine, and α-pyridil present tunneling-active C−H stretch modes in opposition to benzene. 5H;reaction pathway yields;pyridil;adiabatic barriers show;benzene;dehydrogenation products;scanning tunneling microscope;phenyl;6H;Inelastic Spectroscopy SimulationsWe;STM;pyridine 2007-04-11
    https://acs.figshare.com/articles/journal_contribution/Dehydrogenation_of_Aromatic_Molecules_under_a_Scanning_Tunneling_Microscope_Pathways_and_Inelastic_Spectroscopy_Simulations/3013558
10.1021/ja067442g.s001