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MO: Fachverband Molekülphysik

MO 14: Poster 1: Cluster, Femtosecond Spectroscopy

MO 14.28: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Benzene activation and H/D isotope effects in reactions of size selected iron, cobalt and nickel cluster ions — Christine Merkert, •Jennifer Mohrbach, Matthias Tombers, Lars Barzen, Maximilian Gaffga, and Gereon Niedner-Schatteburg — Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

A Penning ion trap served to investigate the reaction of size selected transition metal cluster ions in the size range 3<n<30 with benzene and benzene-d6 under single collision conditions. We performed kinetic studies by Fourier-Transform Ion-Cyclotron-Resonance (FT-ICR) mass spectrometry on anionic and cationic iron, cobalt and nickel clusters. Kinetic Isotope Effects KIE(n) in total reaction rates are inverse, Dehydrogenation Isotope Effects DIE(n) are predominantly normal. A multistep model of adsorption and stepwise dehydrogenation from the precursor adsorbate proves suitable to rationalize the found KIEs and DIEs in principle^[1].

[1] M. Tombers, L. Barzen, G. Niedner-Schatteburg, Inverse H/D isotope effects in benzene activation by cationic and anionic cobalt clusters, accepted at Journal of Physical Chemistry