Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Metal substrates: Adsorption of organic / bio molecules I
O 3.2: Vortrag
Montag, 14. März 2011, 11:30–11:45, PHY C213
Incorporation dynamics of molecular guests into 2D supramolecular host-systems at the liquid-solid interface — •Georg Eder1, Stephan Kloft1, Natalia Martsinovich2, Wolfgang M. Heckl3,4, and Markus Lackinger1,3 — 1LMU Munich, Germany — 2University of Warwick, UK — 3Deutsches Museum, Munich — 4TUM School of Education, Munich
Self-assembly of threefold symmetric tricarboxylic acids at the liquid-solid interface can yield crystalline nanoporous monolayers. Prominent examples are 1,3,5-tricarboxylic acid (TMA) and 1,3,5-benzenetribenzoic acid (BTB), which both form hydrogen bonded porous structures at the nonanoic acid-graphite interface with pore sizes of ∼1.0 nm and ∼2.8 nm respectively. It has been shown - also for many other systems - that such nanoporous networks can be utilized as host-networks for the incorporation of molecular guests.
Up to now, predominantly the initial and final structures have been characterized by in-situ Scanning-Tunneling-Microscopy but very little is known about the dynamics. In order to gain a deeper understanding of the incorporation dynamics, we developed an injection system which allows us to simultaneously image the mononlayers with submolecular resolution while the guests are introduced to the liquid phase. Even with the modest time resolution of the STM, for coronene guests important differences were revealed for different solvents and different pore sizes. Supported by Molecular Mechanics Simulations, the nature of a comparatively long lived intermediate state could be identified.