Dresden 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.82: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
Organized Chirality at the Solid/Liquid Interface: An In-Situ STM Study — •Minh Hai Nguyen Thi1, Nakcheol Jeong2, Barbara Kirchner1, Makus Reiher3, Christoph A. Schalley4, Klaus Wandelt1, and Peter Broekmann1 — 1Institut f. Physikalische und Theoretische Chemie, Universität Bonn — 2Department of Chemistry and Division of Molecular Engineering and Chemistry, Korea University — 3Institut f. Physikalische Chemie, Universität Jena — 4Institut f. Chemie und Biochemie, Freie Universität Berlin
The phase behavior of chiral metallo-supramolecular rhomboids of the Fujita type has been studied under electrochemical conditions by means of in-situ STM. A Cu(100) electrode which is pre-covered by a well ordered c(2 x 2) chloride layer served as substrate for the subsequent adsorption of positively charged metal complexes of the Fujita type. Characteristically, these metallo-supramolecular cages exhibit a molecular cavity of about 1.6 nm diameter and can therefore be regarded as potential model systems for the inclusion of small aromatic molecules in terms of supramolecular host/guest chemistry. On the c(2 x 2) chloride lattice these rhomboids adsorb flat lying with their cavity oriented to the solution phase. The racemic mixture of the chiral rhomboids spontaneously separates at the surface into two laterally well ordered mirror domains of enatiomerically pure rhomboids. When only one of both enatiomers is added to the supporting electrolyte we consequently observe only one of both mirror domains leading to a truly chiral electrode surface. Submolecular features of the chiral rhomboids in the STM experiment can be understood with the help of additional DFT calulations.