Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 16: Ions
MO 16.6: Talk
Thursday, March 17, 2022, 12:00–12:15, MO-H5
Cryo Kinetics and IR Spectroscopy of Nitrogen on Tantalum Cluster — •Daniela V. Fries, Annika Straßner, Matthias P. Klein, Maximilian Huber, Marc H. Prosenc, and Gereon Niedner-Schatteburg — TU Kaiserslautern, Kaiserslautern, Deutschland
As motivated by prior room temperature studies on Ta2+ [1] we investigate larger Tan+ clusters (3<n<8) and their N2 adsorption and activation abilities by adsorption kinetics and infrared spectroscopy under cryo conditions compared with DFT calculations.
The model system Ta4+ appears to be of particular interest with regard to cryo N2 activation. Experimental results reveal peculiar details for the first and second adsorption kinetics. The absence of any NN stretching signature in [Ta4(N2)1]+ and [Ta4(N2)2]+ indicates cleavage of the first two adsorbed dinitrogen molecules. We unravel a multistep above edge across surface (AEAS) activation mechanism.[2]
In addition to the investigations of these tantalum cations we are interested in the N2 adsorption on tantalum anions (Tan−, 4<n<10). Initial experiments observe strong size dependencies which are subject of ongoing interpretation.
[1] Proc. Natl. Acad. of Sci. USA, 2018, 115, 11680-11687.
[2] Phys. Chem. Chem. Phys., 2021,23, 11345-11354.