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MO: Fachverband Molekülphysik

MO 14: Cluster

MO 14.5: Talk

Thursday, March 13, 2008, 09:30–09:45, 3G

IR spectroscopy on isolated cobalt-alcohol cluster anions — •Philip Bialach¹, Martin Weiler¹, Michaela Braun², Arne Lüchow², and Markus Gerhards¹ — ¹TU Kaiserslautern, Fachbereich Chemie, Schrödingerstr. 52, 67663 Kaiserslautern & H.-Heine Uni Düsseldorf, Institut für Physikalische Chemie I, 40225 Düsseldorf — ²RWTH Aachen, Institut für Physikalische Chemie, Landoltweg 2, 52056 Aachen

As an example of a model system for investigating metal-anion/ligand compounds we report on clusters of cobalt and alcohols, e.g. methanol, ethanol and propanol. There are questions in understanding the change in physical and chemical properties with increasing cluster size. The metal anions are produced by laser ablation and the alcohols are attached in a supersonic beam. By applying IR-photodetachment or photofragment spectroscopy the OH stretching vibrations of mass-selected cobalt/n/alcohol/m/ cluster anions (n,m = 1-3, alcohol=methanol,ethanol,propanol) are investigated. By comparing the experimental results with predictions of ab initio and DFT calculations structural assignments can be obtained. Both the orientation of the OH groups with respect to the metal clusters as well as the orientation of the aliphatic side chains of the alcohols can be discussed.