Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Metal substrates: Adsorption of organic / bio molecules III
O 18.4: Talk
Tuesday, March 24, 2009, 11:15–11:30, SCH A118
Differences in Self Assembly of Linear Dicarboxylic Acids — •Christoph Heininger1, Lorenz Kampschulte1,2, Markus Lackinger1, and Wolfgang Heckl1,2 — 1Ludwig-Maximilians-University and Center for NanoScience, Theresienstrasse 41, 80333 München — 2Deutsches Museum, Museumsinsel 1, 80538 München
Self-assembly at the liquid solid interface into two-dimensionally ordered supramolecular structures of three aromatic dicarboxylic acids;2,6- naphthalenedicarboxylic acid (NDA), 4,4*-biphenyldicarboxylic acid (BPDA), and 4,4*-stilbenedicarboxylic acid (SDA)is studied by scanning tunneling microscopy. The structure of the compunds is very similar and consists of two interconnected aromatic moieties and functionalization through two carboxylic groups in linear configuration. For all molecules, ordered monolayers were observed on a graphite substrate, and the resulting structures can be described as a dense packing of one-dimensionally hydrogen-bonded rows. Concerning the stability of the adsorbate layers, the average domain size, and the degree of order, distinct differences were noticed. Supported by density functional theory (DFT) calculations, these differences are analyzed and explained as a consequence of molecular structure, adsorption geometry, and adsorption energy.