Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets
MO 19.11: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
IR spectroscopy on anionic and cationic, two- and three-centred, isolated nickel-ethanol clusters — •Daniel Bellaire1, Markus Becherer1, Fabian Dietrich1, Adam Kubas2, Karin Fink2, and Markus Gerhards1 — 1TU Kaiserslautern, Fachbereich Chemie, Erwin-Schrödinger-Straße 52, 67663 Kaiserslautern — 2Karlsruhe Institute of Technology, Insitute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen
Clusters containing transition metals and aliphatic ligands provide model systems regarding e.g. catalytical properties, magnetism, reactivity and structure. Thus, the successive variation of size and composition of the metal clusters can give a fundamental insight. The investigated nickel clusters are produced by applying laser ablation to a rotating metal rod and by attaching the ethanol ligand(s) in a supersonic beam. The frequencies and frequency shifts of OH stretching vibrations (between different clusters) are probed by means of IR-photofragmentation spectroscopy. An assignment of structure and spin states is performed by comparing the experimentally observed vibrational frequencies with the calculated values obtained from DFT calculations.
Specifically, anionic and cationic Nim(ethanol)n+/− (m=2,3; n=1-3) clusters are spectroscopically investigated and explored by the aforementioned methods. A strong OH bond activation is observed in the anionic cases. The results give insight both into the structure and reactivity of the nickel aggregates.