Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 97: Nanostructures at Surfaces: Molecular Systems II
O 97.10: Vortrag
Donnerstag, 23. März 2017, 17:45–18:00, REC/PHY C213
Solution-free synthesis of diboronic acid-derived COF monolayers on surfaces — •Saskia Spitzer1,2, Atena Rastgoo1,2, Viktoria Ritter1,2, Wolfgang Heckl1,2,3, and Markus Lackinger1,2,3 — 1Department of Physics, Tech. Univ. Munich, James-Franck-Str. 1, 85748 Garching — 2Center for NanoScience (CeNS), Schellingstr. 4, 80799 Munich — 3Deutsches Museum, Museumsinsel 1, 80538 Munich
Currently, surface-supported highly stable two-dimensional covalent organic frameworks (COF) with the highest structural qualities are achieved through condensation reactions as boronic acid dehydration. [1,2] The presence of water during the polymerization as equilibrium regulating agent induces bond reversibility. We combined this established approach with the merits of a solvent-free monomer deposition from the vapor phase. Thermal sublimation of larger diboronic acid monomers, due to their high reactivity, required an additional protection-deprotection-approach. The resulting networks were characterized on different length scales by a combination of light microscopy and Scanning Tunneling Microscopy, thus verifying the preparation protocol.
[1] J. F. Dienstmaier et al., ACS Nano, 5, 9737-9745 (2011)
[2] C. Z. Guan et al., Chem. Commun., 48, 2943-2945 (2012)