Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Nonaqueous Liquid/Solid Interfaces
O 45.5: Vortrag
Mittwoch, 18. März 2015, 12:30–12:45, HE 101
Temperature-induced different patterns in the self-assembled network of Benzene-1,3,5-triphosphonic acid observed by scanning tunneling microscopy at the liquid-solid interface. — •Doan Chau Yen Nguyen1, Thi Ngoc Ha Nguyen1, Michael Mehring2, and Michael Hietschold1 — 1Solid Surfaces Analysis Group, Institute of Physics, Chemnitz University of Technology, Chemnitz, Germany — 2Coordinations Chemistry Group, Institute of Chemistry, Chemnitz University of Technology, Chemnitz, Germany
Benzene-1,3,5-triphosphonic acid (BTP), which is the phosphonic acid analogue of trimesic acid (TMA), forms a columnar packing in the crystalline solid state that is characterized by strong hydrogen bonds and ii-stacking involving the aromatic rings. Therefore, BTP is an interesting intermediate to design both three-dimension (3D) supramolecular hydrogen-bonded architectures and organic-inorganic hybrid frameworks. Supramolecular self- assembly at liquid solid interfaces is a thermodynamically complex process producing a variety of structures. The formation of multiple network morphologies from the same molecular building blocks is a common occurrence. We use Scanning Tunneling Microscopy (STM) to investigate the self-assembly of BTP in different kind of solvents (undecanol, octanoic acid) adsorbed on highly oriented pyrolytic graphite (HOPG (0001). The influence of substrate temperature is studied and the STM results reveal that with every kind of solvents, the influence of substrate temperature is strong enough to induce different self-assembled structures of BTP on the substrate.