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Photoinduced energy and electron transfer
Spectroscopic investigations of ultrafast photoinduced energy and electron transfer in transition metal complexes present a central focus of our work. In particular, we are interested in the interplay between molecular structure, photoinduced dynamics and the function of the complexes. Currently, we are focussing on detailing the light-induced reaction steps in molecular photocatalysts, highly luminescent Ru, Os and Fe terpyridine complexes, terpyridine-based coordination polymers and complexes potentially used in dye-sensitized solar cells.
This work is financially supported by the Thüringer Ministerium für Bildung, Wissenschaft und Kultur via the ProExzellenz Initiative (project PhotoMIC).
Photoinduced dynamics in Protochlorophyllide a
Within this project, the mechanistic interplay between protein structure of the protochlorophyllide-NADPH-oxidoreductase and its function will be investigated on an ultrafast timescale (on the time scale of picoseconds, i.e., 10-12 s). This is done by combining mutagenesis studies of the catalytic reaction center with various spectroscopic tools such as femtosecond time-resolved differential absorption (in the UV/Visultraviolet/&zwnj and mid-IRinfrared spectral range) and picosecond time-resolved luminescence measurements on the substrate protochlorophyllide a. This combination of techniques enables the assessment of individual protein sites, which are critical for the ultrafast photoresponse of the enzyme, and the determination of the relevant reaction coordinates on an ultrafast time-scale.
This work is supported by the German Science Foundation (DFG) via the Jena School of Microbial Communication.
Femtosecond time-resolved transient chirality
Chirality is ubiquitous in nature. However, it is extremely difficult to access the small photoinduced chirality changes in small molecules. We have established an experimental setup for investigating transient chirality changes with sub-200-fs temporal resolution in the UVultraviolet spectral range. First experiments dealt with the photophysics of 7-dehydrocholesterol and could resolve ambiguities in the interpretation of the photophysical data obtained from transient absorption spectroscopy.
This work is financially supported by the German Science Foundation (DFG).
Nanoparticle-molecule interfaces play a central role in e.g. opto-electronic devices such as dye-sensitized solar cells or in heterogeneous catalysis. Our research interest lies in the construction of well defined nanoparticle-molecule interfaces both on metals and semiconductors and the spectroscopic characterization of photoinduced processes in such systems. In particular, we are interested in the interfacial charge-transfer processes and their correlation with the geometrical and electronic structure of the molecules at the interface.
This work is financially supported by the Bundesministerium für Bildung und Forschung via the program Spitzenforschung und Innovation in den Neuen Ländern (project Phona).
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