Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: Surface chemical reactions
O 87.6: Vortrag
Freitag, 30. März 2012, 11:45–12:00, MA 042
Surface chemical reactions constrained in one dimension — •Dingyong Zhong1,2, Gerhard Erker3, Harald Fuchs1,2, and Lifeng Chi1,2 — 1Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 2Center for Nanotechnology (CeNTech), Universität Münster, Heisenbergstr. 11, 48149 Münster, Germany — 3Organisch-Chemisches Institut, Universität Münster, Corrensstr. 40, 48149 Münster, Germany
Although bulk gold has long been considered minimally reactive, exhibiting poor catalytic activity, the Au(110) surface which exhibits a one-dimensional (1D) geometrical constraint, can acts as the platform for carbon-hydrogen bond activation of inert alkanes. The 1.22 nm wide atomic grooves resulting from the missing-row reconstruction of Au(110) surface efficiently confine the diffusion of adsorbed molecules and constrain the molecules into a 1D pathway, their interactions restricted to neighboring molecules in the easy-diffusion direction within the atomic channels. The hydrogen atoms on terminal methyl or penultimate methylene groups can dissociate and desorb from the surface at 420 to 470 K, leading to carbon-carbon bond formation between the residual alkyl chains. The studies imply that the physical and chemical behaviors of molecule-on-surface systems can be dramatically altered by 1D spatial constraint.