Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 93: Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses I
O 93.7: Vortrag
Donnerstag, 15. März 2018, 12:30–12:45, HE 101
Direct Observation of Reaction Dynamics by Femtosecond Electron Diffraction — •Henrike Müller-Werkmeister1,2, Yifeng Jiang1, Lai Chung Liu3, and R. J. Dwayne Miller1,3 — 1Max Planck Institute for the Structure and Dynamics of Matter, 22607 Hamburg, Germany — 2Institute of Chemistry, Physical Chemistry, University of Potsdam, 14476 Potsdam, Germany — 3Departments of Chemistry and Physics, University of Toronto, Toronto, M5S 3H6, Canada
Femtosecond electron diffraction (FED) is a sensitive tool to directly study molecular dynamics in structural detail. We have studied the photoinduced spin crossover (SCO) in the coordination compound [FeII(PM-AzA)2](NCS)2 (or AZA). The unique capability of FED allows us to directly probe atomic motions and to track ultrafast structural changes within the crystal lattice of AZA. The data and refinement calculations indicate the global structural reorganization within 2.3 ps, as the metal-to-ligand bond distribution narrows during intramolecular vibrational energy redistribution (IVR), driving the molecular rearrangement. Three independent dynamical groups are identified to model the structural dynamics upon photoinduced SCO.
Y. Jiang, L. Liu, H. M. Müller-Werkmeister, C. Lu, D. Zhang, R. L. Field, A. Sarracini, G. Moriena, E. Collet, and R. J. D. Miller, Angew. Chemie 129, 7236 (2017).