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MS 4.2: Vortrag
Dienstag, 10. März 2020, 14:30–14:45, f128
Nitrophobia of size selected iron clusters under cryo conditions — •Annika Steiner1, Christopher Wiehn1, Matthias P. Klein1, Daniela V. Fries1, Peter B. Armentrout2, and Gereon Niedner-Schatteburg1 — 1Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
We utilize a modified FT-ICR MS to characterize the interaction of N2 with transition metal surfaces and clusters in detail. With this tandem cryo trap (T<11 K) instrument we have investigated the N2 adsorption on Co, Ni, Rh and N2 and H2 co-adsorption on Ru8+.
In continuation of these studies, we conduct investigations of N2 adsorption on Fen+ clusters. We investigate kinetic studies of N2 adsorption and found size and pressure dependent effects. Thereby, we unravel otherwise unpredictable cluster size effects as e.g. very slow N2 adsorption on Fe17+, and an isomerism of the Fe18+ cluster.
Furthermore, we present gas phase IR spectra of N2 adsorption on isolated Fen+ clusters at cryo temperatures. The complex variations in terms of single or multiple IR active N2 stretching bands are significantly red shifted with respect to the IR inactive stretching mode of free N2 (2330 cm−1). Based on this we compare the IR spectra of the “normal” Fe13+ cluster with those of the nitrophobic Fe17+ cluster. In combination with DFT studies, we try to interpret these size effects in terms of size dependent spin repulsion and to unravel cluster morphologies in more detail.