Monolayer Structure of Arachidic Acid on Graphite

Autor(en): Thomas, Loji K.
Kuehnle, Angelika
Rode, Sebastian
Beginn, Uwe 
Reichling, Michael 
Stichwörter: ALKANES; Chemistry; Chemistry, Physical; CHIRALITY; DYNAMICS; ELECTRONICS; IMAGES; INTERFACE; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; ORGANIC-MOLECULES; SCANNING-TUNNELING-MICROSCOPY; Science & Technology - Other Topics; SOLVENT; SURFACES
Erscheinungsdatum: 2010
Herausgeber: AMER CHEMICAL SOC
Journal: JOURNAL OF PHYSICAL CHEMISTRY C
Volumen: 114
Ausgabe: 44
Startseite: 18919
Seitenende: 18924
Zusammenfassung: 
The self-assembly of arachidic acid (C19H39COOH) at the liquid solid interface between 1-phenyloctane (C6H5(CH2)(7)CH3) and highly oriented pyrolytic graphite (HOPG) is studied by scanning tunneling microscopy (STM) to identify the structure of the monomolecular film. We observe the formation of highly ordered domains with molecules oriented in three different orientations compatible with the symmetry of the HOPG substrate, a spontaneous enantiomeric separation of the pro-chiral molecules, and reveal structural details with submolecular resolution. To determine the surface unit cell with an intrinsic calibration to the substrate atomic structure, the intermolecular distance is precisely determined from the analysis of a SIN image exhibiting a moire pattern created by the superposition of current contributions from the molecular structure with contributions from the graphite atomic lattice. The dimensions of the unit cell accommodating two molecules are vertical bar a vertical bar 0.94 nm and vertical bar b vertical bar = 2.83 nm with an angle of 85 degrees between unit cell vectors a and h. The respective molecular arrangement allows hydrogen bonding between carboxylic groups with an unrelaxed O-O bond distance of 0.31 nm.
ISSN: 19327447
DOI: 10.1021/jp105205y

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