Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.10: Poster
Monday, March 12, 2018, 17:30–19:30, Poster A
Raman spectroscopy on bioinorganic model complexes — •Dieter Rukser1, Florian Biebl1, Melissa Teubner1,2, Benjamin Grimm-Lebsanft1, Patricia Liebhäuser2, Sarah Neville3, Alexander Hoffmann2, Linda Doerrer3, Sonja Herres-Pawlis2, and Michael Rübhausen1 — 1Center for Free Electron Laser Science, Universität Hamburg — 2Instiut für anorganische Chemie, RWTH Aachen — 3Inorganic Chemistry, Boston University
Elucidating charge-transfer dynamics of transition metal complexes is crucial for the understanding of a multitude of biochemical processes. Raman spectroscopy is a useful tool to study model complexes mimicking these processes.
By resonant excitation of the transition state, the electron transfer is accessible through vibrational modes, which are coupled to metal-ligand charge transfer (MLCT) and ligand-metal charge transfer (LMCT) states.
We have studied bioinorganic copper complexes using resonant as well as time-resolved Raman spectroscopy. For complexes stable at temperatures below -60 °C we have designed a Peltier cooled cryostat for our UT-3 Raman spectrometer, allowing operando oxygenation and measurement of the samples at temperatures down to -90 °C.
For samples that are damaged by laser radiation, we have designed several jet-based delivery systems. Jet diameters down to 10 μm and flow rates of 15 μL/min allowed us to measure small sample volumes for several hours.