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O: Fachverband Oberflächenphysik
O 75: Metal Substrates: Growth Studies
O 75.8: Vortrag
Mittwoch, 18. März 2020, 16:45–17:00, WIL C107
Reaction of Na/Br-carbenoid on NaBr surface investigated by scanning tunneling microscopy — •abhijit bera1, katharina dilchert2, viktoria däschlein gessner2, and karina morgenstern1 — 1Ruhr-Universität Bochum, Chair of Physical Chemistry I, Bochum, Germany — 2Ruhr-Universität Bochum, Chair of Inorganic Chemistry II, Bochum, Germany
Understanding of active radicals is important as they are short-lived intermediates in almost all chemical reactions, but because of their limited life-time, there is very little fundamental knowledge about it. For investigating radicals on surface science approach, we have grown sodium bromide (NaBr) layers on Ag(111) at room temperature and investigated layer formation, atomic resolution, defects and a moiré pattern by scanning tunneling microscopy. We employ this spacer layer to analyse a carbenoid compound, which is a reactive intermediate of many reactions. Recently metal halide (M/X) carbenoids attracted interest of many chemists due to their strong electrophilic character. However, the major concern is the stability because of their tendency of M-X eliminations. In solutions, it is possible to stabilize the carbenoid by addition of metal salt. We have deposited the Na/Br carbenoid with the type of [Ph2P(S)]2CMX on Ag(111) and also on the NaBr surface at 100-110 K and imaged at 120-140 K.We found that this compound tends to dissociate on Ag(111) surface and lose its character. But on the NaBr surface it is uniformly distributed and keeps its shape intact, which strongly suggests that,Na/Br-carbenoid makes coordination with NaBr salt.