Hannover 2010 – scientific programme
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MO: Fachverband Molekülphysik
MO 33: Cluster II
MO 33.2: Talk
Friday, March 12, 2010, 14:15–14:30, F 102
IR spectroscopy on anionic cobalt(alcohol) clusters — •Philip Bialach1, Martin Weiler1, Andreas Funk1, Arne Luechow2, and Markus Gerhards1 — 1TU Kaiserslautern, Physikalische und Theoretische Chemie, Erwin-Schrödingerstr. 52, 67663 Kaiserslautern — 2RWTH Aachen, Institut für Physikalische Chemie, Landoltweg 2, 52056 Aachen
Investigations on clusters containing transition metals and aliphatic ligands provide the opportunity to study the differences between small molecular systems and nanoscaled particles. The changes in physical and chemical properties by increasing the cluster size can be analyzed. The successive aggregation of ligands (e.g. alcohol molecules) on cobalt containing anionic metal clusters is investigated in a molecular beam experiment. Here the first IR spectroscopic analyses of anionic clusters containing cobalt atoms (1-4) and alcohol molecules (1-3 methanol, ethanol or n-propanol molecules) are presented. The anionic cobalt clusters are produced via a laser ablation source. To obtain structural information about the (cobalt)n=1-4 (alcohol)m=1-3 cluster anions the frequencies of the OH-stretching vibrations are probed by means of IR-photodetachment and IR-photofragmentation spectroscopy, respectively. The structural assignment is performed by comparing the experimental data with calculated frequencies obtained from ab initio and DFT calculations. It is shown that high spin complexes are preferred. In clusters containing at least two cobalt atoms the alcoholic OH groups are directed towards the Co-Co bonds.