Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 38: Metal substrates: Adsorption of atoms and inorganic molecules
O 38.7: Vortrag
Dienstag, 13. März 2018, 15:30–15:45, MA 144
Ester formation without any catalyst at the liquid-solid interface — •Nguyen Thi Ngoc Ha1, Gopakumar T. G.2, Yen N. D. C.1, Carola Mende3, Lars Smykalla1, Roy Buschbeck3, Tobias Rüffer3, Heinrich Lang3, Maik Schlesinger4, Michael Mehring4, and Michaele Hietschold1 — 1Solid Surfaces Analysis Group, Institute of Physics, Technische Universität Chemnitz, Chemnitz, Germany — 2Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India — 3Inorganic Chemistry, Institute of Chemistry, Technische Universität Chemnitz, Chemnitz, Germany, — 4Coordination Chemistry, Institute of Chemistry, Technische Universität Chemnitz, Chemnitz, Germany
A chemical reaction (esterification) within a molecular monolayer induced by increasing the molecular packing density of this layer at a liquid-solid interface is studied by ambient scanning tunnelling microscopy (STM). The self-assembled ordered monolayer consisting of trimesic acid and undecanol/decanol with a molecular ratio of both species of 1:1 forms at the interface to the highly oriented pyrolytic graphite (HOPG) out of a solution of TMA in decanol/undecanol. As the packing denisty is increased at interface, by extended sonication, heating or stirring of the solution the trimesic acid reacts with undecanol/decanol within the monolayer and froms a monoester without the presence of any catalyst. The ester formation at the interface is further confirmed by theoretical calculations and chemical analysis of the solutions using different methods.