Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Nanostructures at Surfaces V (Self Organization of Molecules)
O 49.1: Vortrag
Donnerstag, 29. März 2007, 11:15–11:30, H36
Insertion of Cu into ordered oligopyridine networks — •Achim Breitruck1, Christoph Meier2, Harry E. Hoster1, Ulrich Ziener2, and Rolf J. Behm1 — 1Institut für Oberflächenchemie und Katalyse, Universität Ulm, 89069 Ulm — 2Institut für Organische Chemie III, Universität Ulm, 89069 Ulm
The effect of Cu deposition on pre-deposited ordered quasiquadratic networks (QQN) on HOPG was investigated by scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV) conditions. Deposition of small amounts of Cu and subsequent annealing results in the formation of a new hexagonal metal organic network (HMON), coexisting with the ordered oligopyridine precursor layer. The formation of the HMON phase is accompanied by a loss in hydrogen bonds, prevailing in the QQN phase. This loss is overcompensated by the formation of strong Cu-pyridine interactions - the structure determining interactions in the HMON. Hence, the structural transition, from QQN phase to the hexagonal metal organic network is induced by a Cu mediated gain in intermolecular interaction energy.