Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.106: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Self-Assembly of 3D-molecule: Benzene 1,3,5 Triphosphonic acid (BTP) studied by Scanning Tunneling Microscopy (STM) at the Liquid-Solid Interface — •Nguyen Thi Ngoc Ha1, Michael Dieblich1, Michael Mehring2, and Michael Hietschold1 — 1Institute of Physics, Solid Surfaces Analysis Group, Chemnitz University of Technology, Chemnitz, Germany. — 2Institute of Chemistry, Coordinations Chemistry Group, Chemnitz University of Technology, Chemnitz, Germany.
During the last two decades, there has been major effort toward metal phosphate chemistry due to their endearing properties and their potential for supramolecular assembly[1]. Crystal engineering is a relatively new field of chemical research used to control or predict types of metal phosphonate structure[1,5]. Surprisingly, the phosphonic acids have not been the subject of scanning tunneling microscopy (STM) to our knowledge so far. Here we report a very first STM studying of the benzene triphosphonic acid (BTP) [1,3,5-[(HO)2(O)P]3C6H3] dissolved in an alkanoic acid solvent (octanoic acid). The three-dimensional network formed by self-assembly of this triphosphonic acid on a HOPG(0001) substrate exhibits a ladder-like appearance and agrees very well with other crystallographic studies[2,4,5]. BTP in this structure adsorbed opposite to each other as viewed along an axis orthogonal to the plane defined by the aromatic rings. The brightest features in regular patterns should be reported phosphonic end- groups.