Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Solid-liquid Interfaces II
O 18.10: Vortrag
Montag, 31. März 2014, 18:15–18:30, WIL A317
Temperature-controlled 3d self-assembling of benzene-1,3,5-triphosphonic acid observed by scanning tunneling microscopy (STM) at the liquid-solid interface — •Chau Yen Nguyen Doan1, Ngoc Ha Nguyen Thi1, Michael Mehring2, and Michael Hietschold1 — 1Solid Surfaces Analysis Group, Institute of Physics, TU-Chemnitz, Chemnitz, Germany — 2Institute of Chemistry, TU-Chemnitz, 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 π-stacking involving the aromatic rings. Therefore, BTP is an interesting intermediate to design both 3D supramolecular hydrogen-bonded architectures and organic-inorganic hybrid frameworks. The 2D or 3D crystal engineering of molecular architectures on surfaces requires controlling various parameters related respectively to the substrate, the chemical structure of the molecules, and the environmental conditions. We investigate here the influence of temperature on the self-assembly of BTP at the undecanol-HOPG interface using ambient STM. The geometry adsorption of the 3D self-assembled BTP can be precisely tuned by adjusting the substrate temperature from 20∘C to 60∘C. STM images at different substrate temperature reveal the different co-adsorption structures as well as different packing density of BTP and undecanol solvent molecules. Based on these results, temperature-control has been proven to be a versatile tool to adjust the polymorphism of molecular patterns deposited out of solutions.