Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 34: Nanostructures at Surfaces II
O 34.3: Talk
Tuesday, March 8, 2016, 11:00–11:15, H6
On-surface synthesis of covalent organic nanostructures on metals and strategies for post synthetic decoupling — •Atena Rastgoo Lahrood1,2, Jonas Björk3, Matthias Lischka1,2, Johanna Eichhorn1,2, Wolfgang M. Heckl1,2,4, and Markus Lackinger1,2,4 — 1Department of Physics, Tech. Univ. Munich, James-Franck-Str. 1, 85748 Garching — 2Center for NanoScience (CeNS), Schellingstr. 4, 80799 Munich — 3Department of Physics Chemistry and Biology, IFM Linköping University, 58183 Linköping, Sweden — 4Deutsches Museum, Museumsinsel 1, 80538 Munich
On-surface polymerization is a versatile approach for the synthesis of otherwise inaccessible extended low-dimensional organic nanostructures. Ullmann coupling as the most favored reaction relies on the reactivity of metal surfaces to initiate the coupling by dissociating halogen substituents. Since the metal surfaces that are indispensable for the synthesis are unfavorable for many applications, we explore strategies for a post synthetic detachment.
Surface chemical studies of 1,3-diiodobenzene on Cu(111) revealed covalently coupled trimers as reaction products adsorbed atop a closed iodine monolayer rather than directly on the metal surface. These unexpected results suggest iodine adsorbs underneath the organics, thereby indicating possibilities for using iodine monolayers for post_synthetic decoupling.
This approach was verified by exposing on-surface synthesized covalent porous 2D polyphenylene networks to iodine vapor. Samples were characterized by STM, XPS, and NEXAFS.